diff --git a/CHANGES b/CHANGES
new file mode 100644
--- /dev/null
+++ b/CHANGES
@@ -0,0 +1,60 @@
+# Changelog for HROOT
+
+## 0.10.0.1
+- Use hackage-version of fficxx (#18)
+- Generate docs in CI (#17)
+- Update flake.nix with recent fficxx and ormolu format (#16)
+- Update fficxx to support GHC 9.4 (#15)
+- Add TMutex and test multithreading with GUI (#12)
+- HROOT now uses common stdcxx (#11)
+- idealized gas simulation (#10)
+- Add TMarker and Range. Test 2D graphics using gas example (#9)
+- HROOT generation and packing via nix (#8)
+- Revive umbrella package generation (#7)
+- Static files (Config.hs, Setup.lhs) and custom-setup dependency (#6)
+- Modernize HROOT with fficxx 0.5.1 (#5)
+
+## 0.9.0.1
+
+## 0.9
+- HROOT-tree
+- HROOT only support ROOT > 6
+
+## 0.8
+- separate packages into HROOT-core, HROOT-hist, HROOT-io, HROOT-math, HROOT-graf and HROOT is now an umbrella package
+
+## 0.7
+- separate all class interfaces and implementation in different modules
+- overhaul Existential
+
+## 0.7.1
+- support for static methods
+- add TROOT
+
+## 0.6.9
+- implement almost all class methods of TLine, TAttLine, TAttMarker, TAttText and TAttPad
+
+## 0.6.8
+- implement almost all class methods of TH2, TH3, TFormula, TF1 and TGraph
+
+## 0.6.7
+- implement almost all TH1 class methods
+
+## 0.6.6
+- do not need OverlappingInstances, IncoherentInstances, UndecidableInstances
+
+## 0.6.4
+- add many TH2 class methods
+
+## 0.6.3
+- Implement Existential Types
+
+## 0.6
+- implement Deletable. delete method for every object
+- refactor HROOT generated file names (Interface.hs, Implementation.hs, FFI.hs)
+
+## 0.5.1
+- support for delete
+
+## 0.5.0
+- initial preview release
diff --git a/Config.hs b/Config.hs
deleted file mode 100644
--- a/Config.hs
+++ /dev/null
@@ -1,85 +0,0 @@
-{-# LANGUAGE ScopedTypeVariables #-}
-
-module Config where
- 
-import Distribution.Simple
-import Distribution.Simple.Setup
-import Distribution.PackageDescription
-import Distribution.Simple.LocalBuildInfo
-
-import System.Exit
-import System.Process
-
-config :: LocalBuildInfo -> IO (Maybe HookedBuildInfo)
-config bInfo = do 
-  (excode, out, err) <- readProcessWithExitCode "root-config" ["--glibs"] ""
-  liboptset' <- case excode of 
-                  ExitSuccess -> do  
-                    return . Just .  mkLibraryOptionSet . words $ out
-                  _ -> do 
-                    putStrLn $ "root-config failure but I am installing HROOT without ROOT. It will not work. This is only for documentation." 
-                    return Nothing              
-  (excode2,out2,err2) <- readProcessWithExitCode "root-config" ["--incdir"] ""
-  incdir' <- case excode2 of 
-               ExitSuccess -> do  
-                 return . Just . head . words $ out2
-               _ -> do 
-                 putStrLn $ "root-config failure but I am installing HROOT without ROOT. It will not work. This is only for documentation." 
-                 return Nothing
-  let Just lib = library . localPkgDescr $ bInfo
-      buildinfo = libBuildInfo lib
-  let (r :: Maybe HookedBuildInfo) = case liboptset' of 
-            Nothing -> Nothing
-            Just liboptset -> 
-              case incdir' of 
-                Nothing -> Nothing 
-                Just incdir -> 
-                  let hbi = emptyBuildInfo { extraLibs = extraLibs buildinfo 
-                                                         ++ libs liboptset
-                                           , extraLibDirs = libdirs liboptset 
-                                           , includeDirs = incdir : includeDirs buildinfo
-                                           }
-                  in Just (Just hbi, []) 
-  return r 
-
-
-data LibraryOptionSet = LibraryOptionSet { 
-  libs :: [String], 
-  libdirs :: [String], 
-  libopts :: [String]
-} deriving Show
-
-data LibraryOption = Lib String 
-                   | Dir String
-                   | Opt String 
-                   deriving Show
-
-mkLibraryOptionSet :: [String] -> LibraryOptionSet
-mkLibraryOptionSet strs = let opts = libraryOptions strs
-                          in  foldr f (LibraryOptionSet [] [] []) opts 
-  where f x (LibraryOptionSet l d o) = case x of
-                                         Lib st -> LibraryOptionSet (st:l) d o 
-                                         Dir st -> LibraryOptionSet l (st:d) o 
-                                         Opt st -> LibraryOptionSet l d (st:o) 
-
-libraryOptions :: [String] -> [LibraryOption] -- LibraryOptionSet 
-libraryOptions = map f 
-  where f x = let r = parseLibraryOptionClassifier x
-              in  case r of 
-                    Left msg -> error (show msg)
-                    Right result -> result
-
-
-parseLibraryOptionClassifier :: String -> Either String LibraryOption 
-parseLibraryOptionClassifier [] = Left "empty option"
-parseLibraryOptionClassifier str@(x:xs) = 
-  case x of
-    '-' -> if null xs 
-             then Left "parse error"
-             else let (y:ys) = xs
-                  in  case y of
-                        'L' -> Right (Dir ys)
-                        'l' -> Right (Lib ys)
-                        _ -> Right (Opt str)
-    _ -> Right (Opt str) 
-
diff --git a/HROOT-tree.cabal b/HROOT-tree.cabal
--- a/HROOT-tree.cabal
+++ b/HROOT-tree.cabal
@@ -1,37 +1,45 @@
-Name:                HROOT-tree
-Version:     0.9.0.1
-Synopsis:    Haskell binding to ROOT Tree modules
-Description:         HROOT is a haskell Foreign Function Interface (FFI) binding to ROOT. ROOT(http://root.cern.ch) is an object-oriented program and library developed by CERN for physics data analysis.
-Homepage:       http://ianwookim.org/HROOT
-license: LGPL-2.1
-license-file: LICENSE
-Author:              Ian-Woo Kim
-Maintainer:  Ian-Woo Kim <ianwookim@gmail.com>
-Category:       Graphics, Statistics, Math, Numerical
-Tested-with:    GHC >= 7.6
-Build-Type:  Custom
-cabal-version:  >=1.10
+Cabal-version: 3.0
+Name:          HROOT-tree
+Version:       0.10.0.1
+Synopsis:      Haskell binding to ROOT Tree modules
+Description:
+  HROOT is a haskell Foreign Function Interface (FFI) binding to ROOT.
+  ROOT(http://root.cern.ch) is an object-oriented program and library
+  developed by CERN for physics data analysis.
+Homepage:      https://wavewave.github.io/HROOT
+license:       LGPL-2.1-or-later
+license-file:  LICENSE
+Author:        Ian-Woo Kim
+Maintainer:    Ian-Woo Kim <ianwookim@gmail.com>
+Category:      Graphics, Statistics, Math, Numerical
+Tested-with:   GHC == 9.0.2 || == 9.2.4 || == 9.4.2 
+Build-Type: Custom
 Extra-source-files:
-                       Config.hs
-                       csrc/HROOTTreeTBranch.h
-                       csrc/HROOTTreeTChain.h
-                       csrc/HROOTTreeTTree.h
-                       csrc/HROOTTreeTBranch.cpp
-                       csrc/HROOTTreeTChain.cpp
-                       csrc/HROOTTreeTTree.cpp
-
-
+  CHANGES
+  csrc/HROOTTreeTBranch.h
+  csrc/HROOTTreeTChain.h
+  csrc/HROOTTreeTTree.h
+  csrc/HROOTTreeTBranch.cpp
+  csrc/HROOTTreeTChain.cpp
+  csrc/HROOTTreeTTree.cpp
+custom-setup
+  setup-depends: Cabal < 4, base > 4 && < 5, process
 
+Source-repository head
+  type:     git
+  location: https://github.com/wavewave/HROOT
 
 Library
   default-language: Haskell2010
   hs-source-dirs: src
   ghc-options:  -Wall -funbox-strict-fields -fno-warn-unused-do-bind -fno-warn-orphans -fno-warn-unused-imports
-  ghc-prof-options: -caf-all -auto-all
-  cc-options: -std=c++14
-  Build-Depends:      base>4 && < 5, fficxx >= 0.3, fficxx-runtime >= 0.3, template-haskell,HROOT-core
+  cxx-options: -std=c++17
+  Build-Depends: base > 4 && < 5, fficxx >= 0.7, fficxx-runtime >= 0.7, template-haskell, stdcxx, HROOT-core == 0.10.0.1
   Exposed-Modules:
                        HROOT.Tree
+                       HROOT.Tree.Ordinary
+                       HROOT.Tree.Template
+                       HROOT.Tree.TH
                        HROOT.Tree.TBranch
                        HROOT.Tree.TChain
                        HROOT.Tree.TTree
@@ -50,21 +58,18 @@
                        HROOT.Tree.TBranch.Implementation
                        HROOT.Tree.TChain.Implementation
                        HROOT.Tree.TTree.Implementation
-
   Other-Modules:
-
   extra-lib-dirs: 
-  extra-libraries:    stdc++ 
+  extra-libraries:    
   Include-dirs:       csrc 
+  pkgconfig-depends: 
   Install-includes:
                        HROOT-treeType.h
                        HROOTTreeTBranch.h
                        HROOTTreeTChain.h
                        HROOTTreeTTree.h
-
-  C-sources:
+  Cxx-sources:
                        csrc/HROOTTreeTBranch.cpp
                        csrc/HROOTTreeTChain.cpp
                        csrc/HROOTTreeTTree.cpp
-
 
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,502 +0,0 @@
-                  GNU LESSER GENERAL PUBLIC LICENSE
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-
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-infringement or for any other reason (not limited to patent issues),
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-
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-so that distribution is permitted only in or among countries not thus
-excluded.  In such case, this License incorporates the limitation as if
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-
-  13. The Free Software Foundation may publish revised and/or new
-versions of the Lesser General Public License from time to time.
-Such new versions will be similar in spirit to the present version,
-but may differ in detail to address new problems or concerns.
-
-Each version is given a distinguishing version number.  If the Library
-specifies a version number of this License which applies to it and
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-conditions either of that version or of any later version published by
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-
-  14. If you wish to incorporate parts of the Library into other free
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-DAMAGES.
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-                     END OF TERMS AND CONDITIONS
-
-           How to Apply These Terms to Your New Libraries
-
-  If you develop a new library, and you want it to be of the greatest
-possible use to the public, we recommend making it free software that
-everyone can redistribute and change.  You can do so by permitting
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-safest to attach them to the start of each source file to most effectively
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-    Copyright (C) <year>  <name of author>
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-    modify it under the terms of the GNU Lesser General Public
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-    version 2.1 of the License, or (at your option) any later version.
-
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-    but WITHOUT ANY WARRANTY; without even the implied warranty of
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-
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-  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
-
-  <signature of Ty Coon>, 1 April 1990
-  Ty Coon, President of Vice
-
-That's all there is to it!
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,27 @@
+import Distribution.Simple
+import Distribution.Simple.Setup
+import Distribution.PackageDescription
+import Distribution.Simple.LocalBuildInfo
+import Config
+
+myconfigHook = simpleUserHooks { confHook = hookfunction }
+
+hookfunction x y = do
+  binfo <- confHook simpleUserHooks x y
+  r_pbi <- config binfo
+  let pkg_descr = localPkgDescr binfo
+
+  let newbinfo = case r_pbi of
+                   Just pbi ->  binfo { localPkgDescr = updatePackageDescription pbi pkg_descr }
+                   Nothing -> do
+                     let r_lib = library pkg_descr
+                     case r_lib of
+                       Just lib ->
+                         let binfo2 = libBuildInfo lib
+                             newlib = lib { libBuildInfo = binfo2 { cSources = [] }}
+                          in  binfo { localPkgDescr = pkg_descr { library = Just newlib }}
+                       Nothing -> error "some library setting is wrong."
+--   putStrLn (show (localPkgDescr newbinfo))
+  return newbinfo
+
+main = defaultMainWithHooks myconfigHook
diff --git a/Setup.lhs b/Setup.lhs
deleted file mode 100644
--- a/Setup.lhs
+++ /dev/null
@@ -1,33 +0,0 @@
-#! /usr/bin/env runhaskell
-  
-> import Distribution.Simple
-> import Distribution.Simple.Setup
-> import Distribution.PackageDescription
-> import Distribution.Simple.LocalBuildInfo
->
-> import Config
->
-> myconfigHook = simpleUserHooks { confHook = hookfunction } 
->
-> hookfunction x y = do 
->   binfo <- confHook simpleUserHooks x y 
->   r_pbi <- config binfo
->   let pkg_descr = localPkgDescr binfo
->   
->   let newbinfo = case r_pbi of 
->                    Just pbi ->  binfo { localPkgDescr = updatePackageDescription pbi pkg_descr }
->                    Nothing -> do 
->                      let r_lib = library pkg_descr 
->                      case r_lib of
->                        Just lib ->  
->                          let binfo2 = libBuildInfo lib
->                              newlib = lib { libBuildInfo = binfo2 { cSources = [] }}  
->                          in  binfo { localPkgDescr = pkg_descr { library = Just newlib }}  
->                        Nothing -> error "some library setting is wrong." 
-> --   putStrLn (show (localPkgDescr newbinfo))
->   return newbinfo
->  
->
-> main = defaultMainWithHooks myconfigHook
->
-
diff --git a/csrc/HROOT-treeType.h b/csrc/HROOT-treeType.h
--- a/csrc/HROOT-treeType.h
+++ b/csrc/HROOT-treeType.h
@@ -1,30 +1,16 @@
+
 #ifdef __cplusplus
-extern "C" { 
+extern "C" {
 #endif
 
-#ifndef __HROOT_TREE__
-#define __HROOT_TREE__
-
-// Opaque type definition for TBranch 
-typedef struct TBranch_tag TBranch_t; 
-typedef TBranch_t * TBranch_p; 
-typedef TBranch_t const* const_TBranch_p; 
-
-
-// Opaque type definition for TChain 
-typedef struct TChain_tag TChain_t; 
-typedef TChain_t * TChain_p; 
-typedef TChain_t const* const_TChain_p; 
-
-
-// Opaque type definition for TTree 
-typedef struct TTree_tag TTree_t; 
-typedef TTree_t * TTree_p; 
-typedef TTree_t const* const_TTree_p; 
-
-
-#endif // __HROOT_TREE__
+#pragma once
 
+// Opaque type definition for $classname
+typedef struct TBranch_tag TBranch_t;typedef TBranch_t * TBranch_p;typedef TBranch_t const* const_TBranch_p;
+// Opaque type definition for $classname
+typedef struct TChain_tag TChain_t;typedef TChain_t * TChain_p;typedef TChain_t const* const_TChain_p;
+// Opaque type definition for $classname
+typedef struct TTree_tag TTree_t;typedef TTree_t * TTree_p;typedef TTree_t const* const_TTree_p;
 #ifdef __cplusplus
 }
 #endif
diff --git a/csrc/HROOTTreeTBranch.cpp b/csrc/HROOTTreeTBranch.cpp
--- a/csrc/HROOTTreeTBranch.cpp
+++ b/csrc/HROOTTreeTBranch.cpp
@@ -1,25 +1,28 @@
-#include <MacroPatternMatch.h>
+
+#include "MacroPatternMatch.h"
+
 #include "HROOTCoreTNamed.h"
+
 #include "HROOTCoreTAttFill.h"
+
 #include "TBranch.h"
-#include "HROOTTreeTBranch.h"
 
+#include "HROOTTreeTBranch.h"
 
+using namespace ROOT;
 
-#define CHECKPROTECT(x,y) IS_PAREN(IS_ ## x ## _ ## y ## _PROTECTED)
+#define CHECKPROTECT(x,y) FXIS_PAREN(IS_ ## x ## _ ## y ## _PROTECTED)
 
 #define TYPECASTMETHOD(cname,mname,oname) \
-  IIF( CHECKPROTECT(cname,mname) ) ( \
-  (to_nonconst<oname,cname ## _t>), \
-  (to_nonconst<cname,cname ## _t>) )
-
+  FXIIF( CHECKPROTECT(cname,mname) ) ( \
+  (from_nonconst_to_nonconst<oname,cname ## _t>), \
+  (from_nonconst_to_nonconst<cname,cname ## _t>) )
 
 TNAMED_DEF_VIRT(TBranch)
 TATTFILL_DEF_VIRT(TBranch)
 TOBJECT_DEF_VIRT(TBranch)
 DELETABLE_DEF_VIRT(TBranch)
-
 TBRANCH_DEF_VIRT(TBranch)
-
 TBRANCH_DEF_NONVIRT(TBranch)
+TBRANCH_DEF_ACCESSOR(TBranch)
 
diff --git a/csrc/HROOTTreeTBranch.h b/csrc/HROOTTreeTBranch.h
--- a/csrc/HROOTTreeTBranch.h
+++ b/csrc/HROOTTreeTBranch.h
@@ -1,46 +1,55 @@
+
 #ifdef __cplusplus
-extern "C" { 
+extern "C" {
 #endif
 
-#ifndef __HROOT_TREE__TBranch__
-#define __HROOT_TREE__TBranch__
+#pragma once
 
+
 #include "HROOT-treeType.h"
+
 #include "HROOTCoreTNamed.h"
+
 #include "HROOTCoreTAttFill.h"
+
 #include "HROOTCoreTObject.h"
-#include "HROOTCoreDeletable.h"
+
+#include "STDDeletable.h"
+
 #include "HROOT-coreType.h"
 
-#undef TBRANCH_DECL_VIRT 
+
 #define TBRANCH_DECL_VIRT(Type) \
 
 
-#undef TBRANCH_DECL_NONVIRT 
+
 #define TBRANCH_DECL_NONVIRT(Type) \
 
 
-#undef TBRANCH_DEF_VIRT
-#define TBRANCH_DEF_VIRT(Type)\
 
+#define TBRANCH_DECL_ACCESSOR(Type) \
 
-#undef TBRANCH_DEF_NONVIRT
-#define TBRANCH_DEF_NONVIRT(Type)\
 
 
-TNAMED_DECL_VIRT(TBranch);
-TATTFILL_DECL_VIRT(TBranch);
-TOBJECT_DECL_VIRT(TBranch);
-DELETABLE_DECL_VIRT(TBranch);
+#define TBRANCH_DEF_VIRT(Type) \
 
 
-TBRANCH_DECL_VIRT(TBranch);
 
+#define TBRANCH_DEF_NONVIRT(Type) \
 
-TBRANCH_DECL_NONVIRT(TBranch);
 
 
-#endif // __HROOT_TREE__TBranch__
+#define TBRANCH_DEF_ACCESSOR(Type) \
+
+
+
+TNAMED_DECL_VIRT(TBranch)
+TATTFILL_DECL_VIRT(TBranch)
+TOBJECT_DECL_VIRT(TBranch)
+DELETABLE_DECL_VIRT(TBranch)
+TBRANCH_DECL_VIRT(TBranch)
+TBRANCH_DECL_NONVIRT(TBranch)
+TBRANCH_DECL_ACCESSOR(TBranch)
 
 #ifdef __cplusplus
 }
diff --git a/csrc/HROOTTreeTChain.cpp b/csrc/HROOTTreeTChain.cpp
--- a/csrc/HROOTTreeTChain.cpp
+++ b/csrc/HROOTTreeTChain.cpp
@@ -1,17 +1,20 @@
-#include <MacroPatternMatch.h>
+
+#include "MacroPatternMatch.h"
+
 #include "HROOTTreeTTree.h"
+
 #include "TChain.h"
-#include "HROOTTreeTChain.h"
 
+#include "HROOTTreeTChain.h"
 
+using namespace ROOT;
 
-#define CHECKPROTECT(x,y) IS_PAREN(IS_ ## x ## _ ## y ## _PROTECTED)
+#define CHECKPROTECT(x,y) FXIS_PAREN(IS_ ## x ## _ ## y ## _PROTECTED)
 
 #define TYPECASTMETHOD(cname,mname,oname) \
-  IIF( CHECKPROTECT(cname,mname) ) ( \
-  (to_nonconst<oname,cname ## _t>), \
-  (to_nonconst<cname,cname ## _t>) )
-
+  FXIIF( CHECKPROTECT(cname,mname) ) ( \
+  (from_nonconst_to_nonconst<oname,cname ## _t>), \
+  (from_nonconst_to_nonconst<cname,cname ## _t>) )
 
 TTREE_DEF_VIRT(TChain)
 TNAMED_DEF_VIRT(TChain)
@@ -20,8 +23,7 @@
 TATTMARKER_DEF_VIRT(TChain)
 TOBJECT_DEF_VIRT(TChain)
 DELETABLE_DEF_VIRT(TChain)
-
 TCHAIN_DEF_VIRT(TChain)
-
 TCHAIN_DEF_NONVIRT(TChain)
+TCHAIN_DEF_ACCESSOR(TChain)
 
diff --git a/csrc/HROOTTreeTChain.h b/csrc/HROOTTreeTChain.h
--- a/csrc/HROOTTreeTChain.h
+++ b/csrc/HROOTTreeTChain.h
@@ -1,63 +1,71 @@
+
 #ifdef __cplusplus
-extern "C" { 
+extern "C" {
 #endif
 
-#ifndef __HROOT_TREE__TChain__
-#define __HROOT_TREE__TChain__
+#pragma once
 
+
 #include "HROOT-treeType.h"
+
 #include "HROOTTreeTTree.h"
+
 #include "HROOTCoreTNamed.h"
+
 #include "HROOTCoreTAttLine.h"
+
 #include "HROOTCoreTAttFill.h"
+
 #include "HROOTCoreTAttMarker.h"
+
 #include "HROOTCoreTObject.h"
-#include "HROOTCoreDeletable.h"
 
-#undef TCHAIN_DECL_VIRT 
+#include "STDDeletable.h"
+
+
 #define TCHAIN_DECL_VIRT(Type) \
-int Type ## _addChain ( Type ## _p p, TChain_p chain ); \
-int Type ## _addChain1 ( Type ## _p p, const char* name, signed long nentries )
+int Type##_addChain ( Type##_p p, TChain_p chain );\
+int Type##_addChain1 ( Type##_p p, const char* name, long nentries );
 
-#undef TCHAIN_DECL_NONVIRT 
+
 #define TCHAIN_DECL_NONVIRT(Type) \
-Type ## _p Type ## _newTChain ( const char* name, const char* title )
+Type##_p Type##_newTChain ( const char* name, const char* title );
 
-#undef TCHAIN_DEF_VIRT
-#define TCHAIN_DEF_VIRT(Type)\
-int Type ## _addChain ( Type ## _p p, TChain_p chain )\
-{\
-return TYPECASTMETHOD(Type,addChain,TChain)(p)->Add(to_nonconst<TChain,TChain_t>(chain));\
+
+#define TCHAIN_DECL_ACCESSOR(Type) \
+
+
+
+#define TCHAIN_DEF_VIRT(Type) \
+int Type##_addChain ( Type##_p p, TChain_p chain ) {\
+return ((TYPECASTMETHOD(Type, addChain, TChain))(p))->Add(from_nonconst_to_nonconst<TChain, TChain_t>(chain));\
 }\
-int Type ## _addChain1 ( Type ## _p p, const char* name, signed long nentries )\
-{\
-return TYPECASTMETHOD(Type,addChain1,TChain)(p)->Add(name, nentries);\
+\
+int Type##_addChain1 ( Type##_p p, const char* name, long nentries ) {\
+return ((TYPECASTMETHOD(Type, addChain1, TChain))(p))->Add(name, nentries);\
 }
 
-#undef TCHAIN_DEF_NONVIRT
-#define TCHAIN_DEF_NONVIRT(Type)\
-Type ## _p Type ## _newTChain ( const char* name, const char* title )\
-{\
-Type * newp = new Type (name, title); \
-return to_nonconst<Type ## _t, Type >(newp);\
+
+#define TCHAIN_DEF_NONVIRT(Type) \
+Type##_p Type##_newTChain ( const char* name, const char* title ) {\
+Type* newp=new Type(name, title);return from_nonconst_to_nonconst<Type##_t, Type>(newp);\
 }
 
-TTREE_DECL_VIRT(TChain);
-TNAMED_DECL_VIRT(TChain);
-TATTLINE_DECL_VIRT(TChain);
-TATTFILL_DECL_VIRT(TChain);
-TATTMARKER_DECL_VIRT(TChain);
-TOBJECT_DECL_VIRT(TChain);
-DELETABLE_DECL_VIRT(TChain);
 
+#define TCHAIN_DEF_ACCESSOR(Type) \
 
-TCHAIN_DECL_VIRT(TChain);
 
 
-TCHAIN_DECL_NONVIRT(TChain);
-
-
-#endif // __HROOT_TREE__TChain__
+TTREE_DECL_VIRT(TChain)
+TNAMED_DECL_VIRT(TChain)
+TATTLINE_DECL_VIRT(TChain)
+TATTFILL_DECL_VIRT(TChain)
+TATTMARKER_DECL_VIRT(TChain)
+TOBJECT_DECL_VIRT(TChain)
+DELETABLE_DECL_VIRT(TChain)
+TCHAIN_DECL_VIRT(TChain)
+TCHAIN_DECL_NONVIRT(TChain)
+TCHAIN_DECL_ACCESSOR(TChain)
 
 #ifdef __cplusplus
 }
diff --git a/csrc/HROOTTreeTTree.cpp b/csrc/HROOTTreeTTree.cpp
--- a/csrc/HROOTTreeTTree.cpp
+++ b/csrc/HROOTTreeTTree.cpp
@@ -1,21 +1,28 @@
-#include <MacroPatternMatch.h>
+
+#include "MacroPatternMatch.h"
+
 #include "HROOTTreeTBranch.h"
+
 #include "HROOTCoreTNamed.h"
+
 #include "HROOTCoreTAttLine.h"
+
 #include "HROOTCoreTAttFill.h"
+
 #include "HROOTCoreTAttMarker.h"
+
 #include "TTree.h"
-#include "HROOTTreeTTree.h"
 
+#include "HROOTTreeTTree.h"
 
+using namespace ROOT;
 
-#define CHECKPROTECT(x,y) IS_PAREN(IS_ ## x ## _ ## y ## _PROTECTED)
+#define CHECKPROTECT(x,y) FXIS_PAREN(IS_ ## x ## _ ## y ## _PROTECTED)
 
 #define TYPECASTMETHOD(cname,mname,oname) \
-  IIF( CHECKPROTECT(cname,mname) ) ( \
-  (to_nonconst<oname,cname ## _t>), \
-  (to_nonconst<cname,cname ## _t>) )
-
+  FXIIF( CHECKPROTECT(cname,mname) ) ( \
+  (from_nonconst_to_nonconst<oname,cname ## _t>), \
+  (from_nonconst_to_nonconst<cname,cname ## _t>) )
 
 TNAMED_DEF_VIRT(TTree)
 TATTLINE_DEF_VIRT(TTree)
@@ -23,8 +30,7 @@
 TATTMARKER_DEF_VIRT(TTree)
 TOBJECT_DEF_VIRT(TTree)
 DELETABLE_DEF_VIRT(TTree)
-
 TTREE_DEF_VIRT(TTree)
-
 TTREE_DEF_NONVIRT(TTree)
+TTREE_DEF_ACCESSOR(TTree)
 
diff --git a/csrc/HROOTTreeTTree.h b/csrc/HROOTTreeTTree.h
--- a/csrc/HROOTTreeTTree.h
+++ b/csrc/HROOTTreeTTree.h
@@ -1,67 +1,75 @@
+
 #ifdef __cplusplus
-extern "C" { 
+extern "C" {
 #endif
 
-#ifndef __HROOT_TREE__TTree__
-#define __HROOT_TREE__TTree__
+#pragma once
 
+
 #include "HROOT-treeType.h"
+
 #include "HROOTCoreTNamed.h"
+
 #include "HROOTCoreTAttLine.h"
+
 #include "HROOTCoreTAttFill.h"
+
 #include "HROOTCoreTAttMarker.h"
+
 #include "HROOTCoreTObject.h"
-#include "HROOTCoreDeletable.h"
+
+#include "STDDeletable.h"
+
 #include "HROOT-coreType.h"
 
-#undef TTREE_DECL_VIRT 
+
 #define TTREE_DECL_VIRT(Type) \
-int Type ## _Branch ( Type ## _p p, const char* folder, int bufsize, int splitlevel ); \
-TBranch_p Type ## _branch1 ( Type ## _p p, const char* name, void* address, const char* leaflist, int bufsize ); \
-int Type ## _fillTree ( Type ## _p p )
+int Type##_Branch ( Type##_p p, const char* folder, int bufsize, int splitlevel );\
+TBranch_p Type##_branch1 ( Type##_p p, const char* name, void* address, const char* leaflist, int bufsize );\
+int Type##_fillTree ( Type##_p p );
 
-#undef TTREE_DECL_NONVIRT 
+
 #define TTREE_DECL_NONVIRT(Type) \
-Type ## _p Type ## _newTTree ( const char* name, const char* title, int splitlevel )
+Type##_p Type##_newTTree ( const char* name, const char* title, int splitlevel );
 
-#undef TTREE_DEF_VIRT
-#define TTREE_DEF_VIRT(Type)\
-int Type ## _Branch ( Type ## _p p, const char* folder, int bufsize, int splitlevel )\
-{\
-return TYPECASTMETHOD(Type,Branch,TTree)(p)->Branch(folder, bufsize, splitlevel);\
+
+#define TTREE_DECL_ACCESSOR(Type) \
+
+
+
+#define TTREE_DEF_VIRT(Type) \
+int Type##_Branch ( Type##_p p, const char* folder, int bufsize, int splitlevel ) {\
+return ((TYPECASTMETHOD(Type, Branch, TTree))(p))->Branch(folder, bufsize, splitlevel);\
 }\
-TBranch_p Type ## _branch1 ( Type ## _p p, const char* name, void* address, const char* leaflist, int bufsize )\
-{\
-return to_nonconst<TBranch_t,TBranch>((TBranch*)TYPECASTMETHOD(Type,branch1,TTree)(p)->Branch(name, address, leaflist, bufsize));\
+\
+TBranch_p Type##_branch1 ( Type##_p p, const char* name, void* address, const char* leaflist, int bufsize ) {\
+return from_nonconst_to_nonconst<TBranch_t, TBranch>((TBranch*)((TYPECASTMETHOD(Type, branch1, TTree))(p))->Branch(name, address, leaflist, bufsize));\
 }\
-int Type ## _fillTree ( Type ## _p p )\
-{\
-return TYPECASTMETHOD(Type,fillTree,TTree)(p)->Fill();\
+\
+int Type##_fillTree ( Type##_p p ) {\
+return ((TYPECASTMETHOD(Type, fillTree, TTree))(p))->Fill();\
 }
 
-#undef TTREE_DEF_NONVIRT
-#define TTREE_DEF_NONVIRT(Type)\
-Type ## _p Type ## _newTTree ( const char* name, const char* title, int splitlevel )\
-{\
-Type * newp = new Type (name, title, splitlevel); \
-return to_nonconst<Type ## _t, Type >(newp);\
+
+#define TTREE_DEF_NONVIRT(Type) \
+Type##_p Type##_newTTree ( const char* name, const char* title, int splitlevel ) {\
+Type* newp=new Type(name, title, splitlevel);return from_nonconst_to_nonconst<Type##_t, Type>(newp);\
 }
 
-TNAMED_DECL_VIRT(TTree);
-TATTLINE_DECL_VIRT(TTree);
-TATTFILL_DECL_VIRT(TTree);
-TATTMARKER_DECL_VIRT(TTree);
-TOBJECT_DECL_VIRT(TTree);
-DELETABLE_DECL_VIRT(TTree);
 
+#define TTREE_DEF_ACCESSOR(Type) \
 
-TTREE_DECL_VIRT(TTree);
 
 
-TTREE_DECL_NONVIRT(TTree);
-
-
-#endif // __HROOT_TREE__TTree__
+TNAMED_DECL_VIRT(TTree)
+TATTLINE_DECL_VIRT(TTree)
+TATTFILL_DECL_VIRT(TTree)
+TATTMARKER_DECL_VIRT(TTree)
+TOBJECT_DECL_VIRT(TTree)
+DELETABLE_DECL_VIRT(TTree)
+TTREE_DECL_VIRT(TTree)
+TTREE_DECL_NONVIRT(TTree)
+TTREE_DECL_ACCESSOR(TTree)
 
 #ifdef __cplusplus
 }
diff --git a/src/HROOT/Tree.hs b/src/HROOT/Tree.hs
--- a/src/HROOT/Tree.hs
+++ b/src/HROOT/Tree.hs
@@ -1,13 +1,13 @@
-module HROOT.Tree (
-  module HROOT.Tree.TBranch
-, module HROOT.Tree.TChain
-, module HROOT.Tree.TTree
-) where
-
+{-# LANGUAGE FlexibleContexts, FlexibleInstances,
+  ForeignFunctionInterface, InterruptibleFFI #-}
+module HROOT.Tree
+       (module HROOT.Tree.TBranch, module HROOT.Tree.TChain,
+        module HROOT.Tree.TTree, module HROOT.Tree.Ordinary,
+        module HROOT.Tree.Template, module HROOT.Tree.TH)
+       where
 import HROOT.Tree.TBranch
 import HROOT.Tree.TChain
 import HROOT.Tree.TTree
-
-
-
-
+import HROOT.Tree.Template
+import HROOT.Tree.TH
+import HROOT.Tree.Ordinary
diff --git a/src/HROOT/Tree/Ordinary.hs b/src/HROOT/Tree/Ordinary.hs
new file mode 100644
--- /dev/null
+++ b/src/HROOT/Tree/Ordinary.hs
@@ -0,0 +1,6 @@
+{-# LANGUAGE FlexibleContexts, FlexibleInstances,
+  ForeignFunctionInterface, InterruptibleFFI #-}
+module HROOT.Tree.Ordinary () where
+import Foreign.C
+import Foreign.Ptr
+import FFICXX.Runtime.Cast
diff --git a/src/HROOT/Tree/TBranch/Cast.hs b/src/HROOT/Tree/TBranch/Cast.hs
--- a/src/HROOT/Tree/TBranch/Cast.hs
+++ b/src/HROOT/Tree/TBranch/Cast.hs
@@ -8,10 +8,11 @@
 import HROOT.Tree.TBranch.RawType
 import HROOT.Tree.TBranch.Interface
 
-instance (ITBranch a, FPtr a) => Castable a (Ptr RawTBranch) where
+instance (ITBranch a, FPtr a) => Castable (a) (Ptr RawTBranch)
+         where
         cast x f = f (castPtr (get_fptr x))
         uncast x f = f (cast_fptr_to_obj (castPtr x))
 
-instance Castable TBranch (Ptr RawTBranch) where
+instance () => Castable (TBranch) (Ptr RawTBranch) where
         cast x f = f (castPtr (get_fptr x))
         uncast x f = f (cast_fptr_to_obj (castPtr x))
diff --git a/src/HROOT/Tree/TBranch/FFI.hsc b/src/HROOT/Tree/TBranch/FFI.hsc
--- a/src/HROOT/Tree/TBranch/FFI.hsc
+++ b/src/HROOT/Tree/TBranch/FFI.hsc
@@ -1,52 +1,73 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
+{-# LANGUAGE ForeignFunctionInterface, InterruptibleFFI #-}
 module HROOT.Tree.TBranch.FFI where
+import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
 import HROOT.Tree.TBranch.RawType
+import HROOT.Tree.TBranch.RawType
 import HROOT.Core.TObject.RawType
 import HROOT.Core.TClass.RawType
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_SetName"
-               c_tbranch_setname :: Ptr RawTBranch -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_SetName" c_tbranch_setname ::
+               Ptr RawTBranch -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_SetNameTitle"
-               c_tbranch_setnametitle ::
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_SetNameTitle" c_tbranch_setnametitle ::
                Ptr RawTBranch -> CString -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_SetTitle"
-               c_tbranch_settitle :: Ptr RawTBranch -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_SetTitle" c_tbranch_settitle ::
+               Ptr RawTBranch -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_SetFillColor"
-               c_tbranch_setfillcolor :: Ptr RawTBranch -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_SetFillColor" c_tbranch_setfillcolor ::
+               Ptr RawTBranch -> CInt -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_SetFillStyle"
-               c_tbranch_setfillstyle :: Ptr RawTBranch -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_SetFillStyle" c_tbranch_setfillstyle ::
+               Ptr RawTBranch -> CInt -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_Draw"
-               c_tbranch_draw :: Ptr RawTBranch -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_Clear" c_tbranch_clear ::
+               Ptr RawTBranch -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_FindObject"
-               c_tbranch_findobject ::
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_Draw" c_tbranch_draw ::
+               Ptr RawTBranch -> CString -> IO ()
+
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_FindObject" c_tbranch_findobject ::
                Ptr RawTBranch -> CString -> IO (Ptr RawTObject)
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_GetName"
-               c_tbranch_getname :: Ptr RawTBranch -> IO CString
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_GetName" c_tbranch_getname ::
+               Ptr RawTBranch -> IO CString
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_IsA"
+foreign import ccall interruptible "HROOTTreeTBranch.h TBranch_IsA"
                c_tbranch_isa :: Ptr RawTBranch -> IO (Ptr RawTClass)
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_Paint"
-               c_tbranch_paint :: Ptr RawTBranch -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_Paint" c_tbranch_paint ::
+               Ptr RawTBranch -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_printObj"
-               c_tbranch_printobj :: Ptr RawTBranch -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_printObj" c_tbranch_printobj ::
+               Ptr RawTBranch -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_SaveAs"
-               c_tbranch_saveas :: Ptr RawTBranch -> CString -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_SaveAs" c_tbranch_saveas ::
+               Ptr RawTBranch -> CString -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_Write"
-               c_tbranch_write ::
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_Write" c_tbranch_write ::
                Ptr RawTBranch -> CString -> CInt -> CInt -> IO CInt
 
-foreign import ccall safe "HROOTTreeTBranch.h TBranch_delete"
-               c_tbranch_delete :: Ptr RawTBranch -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_Write_" c_tbranch_write_ ::
+               Ptr RawTBranch -> IO CInt
+
+foreign import ccall interruptible
+               "HROOTTreeTBranch.h TBranch_delete" c_tbranch_delete ::
+               Ptr RawTBranch -> IO ()
diff --git a/src/HROOT/Tree/TBranch/Implementation.hs b/src/HROOT/Tree/TBranch/Implementation.hs
--- a/src/HROOT/Tree/TBranch/Implementation.hs
+++ b/src/HROOT/Tree/TBranch/Implementation.hs
@@ -1,17 +1,26 @@
 {-# LANGUAGE EmptyDataDecls, FlexibleContexts, FlexibleInstances,
   ForeignFunctionInterface, IncoherentInstances,
-  MultiParamTypeClasses, OverlappingInstances, TypeFamilies,
-  TypeSynonymInstances #-}
+  MultiParamTypeClasses, OverlappingInstances, TemplateHaskell,
+  TypeFamilies, TypeSynonymInstances #-}
 module HROOT.Tree.TBranch.Implementation where
-import FFICXX.Runtime.Cast
+import Data.Monoid
 import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
+import Language.Haskell.TH
+import Language.Haskell.TH.Syntax
 import System.IO.Unsafe
+import FFICXX.Runtime.Cast
+import FFICXX.Runtime.CodeGen.Cxx
+import FFICXX.Runtime.TH
 import HROOT.Tree.TBranch.RawType
 import HROOT.Tree.TBranch.FFI
 import HROOT.Tree.TBranch.Interface
 import HROOT.Tree.TBranch.Cast
+import HROOT.Tree.TBranch.RawType
+import HROOT.Tree.TBranch.Cast
+import HROOT.Tree.TBranch.Interface
 import HROOT.Core.TClass.RawType
 import HROOT.Core.TClass.Cast
 import HROOT.Core.TClass.Interface
@@ -24,22 +33,23 @@
 import HROOT.Core.TObject.RawType
 import HROOT.Core.TObject.Cast
 import HROOT.Core.TObject.Interface
-import HROOT.Core.Deletable.RawType
-import HROOT.Core.Deletable.Cast
-import HROOT.Core.Deletable.Interface
+import STD.Deletable.RawType
+import STD.Deletable.Cast
+import STD.Deletable.Interface
 
-instance ITBranch TBranch
+instance () => ITBranch (TBranch) where
 
-instance ITNamed TBranch where
+instance () => ITNamed (TBranch) where
         setName = xform1 c_tbranch_setname
         setNameTitle = xform2 c_tbranch_setnametitle
         setTitle = xform1 c_tbranch_settitle
 
-instance ITAttFill TBranch where
+instance () => ITAttFill (TBranch) where
         setFillColor = xform1 c_tbranch_setfillcolor
         setFillStyle = xform1 c_tbranch_setfillstyle
 
-instance ITObject TBranch where
+instance () => ITObject (TBranch) where
+        clear = xform1 c_tbranch_clear
         draw = xform1 c_tbranch_draw
         findObject = xform1 c_tbranch_findobject
         getName = xform0 c_tbranch_getname
@@ -48,6 +58,7 @@
         printObj = xform1 c_tbranch_printobj
         saveAs = xform2 c_tbranch_saveas
         write = xform3 c_tbranch_write
+        write_ = xform0 c_tbranch_write_
 
-instance IDeletable TBranch where
+instance () => IDeletable (TBranch) where
         delete = xform0 c_tbranch_delete
diff --git a/src/HROOT/Tree/TBranch/Interface.hs b/src/HROOT/Tree/TBranch/Interface.hs
--- a/src/HROOT/Tree/TBranch/Interface.hs
+++ b/src/HROOT/Tree/TBranch/Interface.hs
@@ -4,6 +4,7 @@
   TypeSynonymInstances #-}
 module HROOT.Tree.TBranch.Interface where
 import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
 import FFICXX.Runtime.Cast
@@ -11,7 +12,7 @@
 import HROOT.Core.TNamed.Interface
 import HROOT.Core.TAttFill.Interface
 
-class (ITNamed a, ITAttFill a) => ITBranch a
+class (ITNamed a, ITAttFill a) => ITBranch a where
 
 upcastTBranch :: forall a . (FPtr a, ITBranch a) => a -> TBranch
 upcastTBranch h
diff --git a/src/HROOT/Tree/TBranch/RawType.hs b/src/HROOT/Tree/TBranch/RawType.hs
--- a/src/HROOT/Tree/TBranch/RawType.hs
+++ b/src/HROOT/Tree/TBranch/RawType.hs
@@ -8,9 +8,9 @@
 data RawTBranch
 
 newtype TBranch = TBranch (Ptr RawTBranch)
-                deriving (Eq, Ord, Show)
+                    deriving (Eq, Ord, Show)
 
-instance FPtr TBranch where
+instance () => FPtr (TBranch) where
         type Raw TBranch = RawTBranch
         get_fptr (TBranch ptr) = ptr
         cast_fptr_to_obj = TBranch
diff --git a/src/HROOT/Tree/TChain/Cast.hs b/src/HROOT/Tree/TChain/Cast.hs
--- a/src/HROOT/Tree/TChain/Cast.hs
+++ b/src/HROOT/Tree/TChain/Cast.hs
@@ -8,10 +8,10 @@
 import HROOT.Tree.TChain.RawType
 import HROOT.Tree.TChain.Interface
 
-instance (ITChain a, FPtr a) => Castable a (Ptr RawTChain) where
+instance (ITChain a, FPtr a) => Castable (a) (Ptr RawTChain) where
         cast x f = f (castPtr (get_fptr x))
         uncast x f = f (cast_fptr_to_obj (castPtr x))
 
-instance Castable TChain (Ptr RawTChain) where
+instance () => Castable (TChain) (Ptr RawTChain) where
         cast x f = f (castPtr (get_fptr x))
         uncast x f = f (cast_fptr_to_obj (castPtr x))
diff --git a/src/HROOT/Tree/TChain/FFI.hsc b/src/HROOT/Tree/TChain/FFI.hsc
--- a/src/HROOT/Tree/TChain/FFI.hsc
+++ b/src/HROOT/Tree/TChain/FFI.hsc
@@ -1,124 +1,160 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
+{-# LANGUAGE ForeignFunctionInterface, InterruptibleFFI #-}
 module HROOT.Tree.TChain.FFI where
+import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
 import HROOT.Tree.TChain.RawType
+import HROOT.Tree.TChain.RawType
 import HROOT.Tree.TBranch.RawType
 import HROOT.Core.TObject.RawType
 import HROOT.Core.TClass.RawType
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_Branch"
-               c_tchain_branch ::
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_Branch" c_tchain_branch ::
                Ptr RawTChain -> CString -> CInt -> CInt -> IO CInt
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_branch1"
-               c_tchain_branch1 ::
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_branch1" c_tchain_branch1 ::
                Ptr RawTChain ->
-                 CString -> (Ptr ()) -> CString -> CInt -> IO (Ptr RawTBranch)
+                 CString -> Ptr () -> CString -> CInt -> IO (Ptr RawTBranch)
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_fillTree"
-               c_tchain_filltree :: Ptr RawTChain -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_fillTree" c_tchain_filltree ::
+               Ptr RawTChain -> IO CInt
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetName"
-               c_tchain_setname :: Ptr RawTChain -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetName" c_tchain_setname ::
+               Ptr RawTChain -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetNameTitle"
-               c_tchain_setnametitle ::
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetNameTitle" c_tchain_setnametitle ::
                Ptr RawTChain -> CString -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetTitle"
-               c_tchain_settitle :: Ptr RawTChain -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetTitle" c_tchain_settitle ::
+               Ptr RawTChain -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_GetLineColor"
-               c_tchain_getlinecolor :: Ptr RawTChain -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_GetLineColor" c_tchain_getlinecolor ::
+               Ptr RawTChain -> IO CShort
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_GetLineStyle"
-               c_tchain_getlinestyle :: Ptr RawTChain -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_GetLineStyle" c_tchain_getlinestyle ::
+               Ptr RawTChain -> IO CShort
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_GetLineWidth"
-               c_tchain_getlinewidth :: Ptr RawTChain -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_GetLineWidth" c_tchain_getlinewidth ::
+               Ptr RawTChain -> IO CShort
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_ResetAttLine"
-               c_tchain_resetattline :: Ptr RawTChain -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_ResetAttLine" c_tchain_resetattline ::
+               Ptr RawTChain -> CString -> IO ()
 
-foreign import ccall safe
+foreign import ccall interruptible
                "HROOTTreeTChain.h TChain_SetLineAttributes"
                c_tchain_setlineattributes :: Ptr RawTChain -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetLineColor"
-               c_tchain_setlinecolor :: Ptr RawTChain -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetLineColor" c_tchain_setlinecolor ::
+               Ptr RawTChain -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetLineStyle"
-               c_tchain_setlinestyle :: Ptr RawTChain -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetLineStyle" c_tchain_setlinestyle ::
+               Ptr RawTChain -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetLineWidth"
-               c_tchain_setlinewidth :: Ptr RawTChain -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetLineWidth" c_tchain_setlinewidth ::
+               Ptr RawTChain -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetFillColor"
-               c_tchain_setfillcolor :: Ptr RawTChain -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetFillColor" c_tchain_setfillcolor ::
+               Ptr RawTChain -> CInt -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetFillStyle"
-               c_tchain_setfillstyle :: Ptr RawTChain -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetFillStyle" c_tchain_setfillstyle ::
+               Ptr RawTChain -> CInt -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_GetMarkerColor"
-               c_tchain_getmarkercolor :: Ptr RawTChain -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_GetMarkerColor" c_tchain_getmarkercolor
+               :: Ptr RawTChain -> IO CShort
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_GetMarkerStyle"
-               c_tchain_getmarkerstyle :: Ptr RawTChain -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_GetMarkerStyle" c_tchain_getmarkerstyle
+               :: Ptr RawTChain -> IO CShort
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_GetMarkerSize"
-               c_tchain_getmarkersize :: Ptr RawTChain -> IO CDouble
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_GetMarkerSize" c_tchain_getmarkersize ::
+               Ptr RawTChain -> IO CFloat
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_ResetAttMarker"
-               c_tchain_resetattmarker :: Ptr RawTChain -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_ResetAttMarker" c_tchain_resetattmarker
+               :: Ptr RawTChain -> CString -> IO ()
 
-foreign import ccall safe
+foreign import ccall interruptible
                "HROOTTreeTChain.h TChain_SetMarkerAttributes"
                c_tchain_setmarkerattributes :: Ptr RawTChain -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetMarkerColor"
-               c_tchain_setmarkercolor :: Ptr RawTChain -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetMarkerColor" c_tchain_setmarkercolor
+               :: Ptr RawTChain -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetMarkerStyle"
-               c_tchain_setmarkerstyle :: Ptr RawTChain -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetMarkerStyle" c_tchain_setmarkerstyle
+               :: Ptr RawTChain -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SetMarkerSize"
-               c_tchain_setmarkersize :: Ptr RawTChain -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SetMarkerSize" c_tchain_setmarkersize ::
+               Ptr RawTChain -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_Draw"
+foreign import ccall interruptible "HROOTTreeTChain.h TChain_Clear"
+               c_tchain_clear :: Ptr RawTChain -> CString -> IO ()
+
+foreign import ccall interruptible "HROOTTreeTChain.h TChain_Draw"
                c_tchain_draw :: Ptr RawTChain -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_FindObject"
-               c_tchain_findobject ::
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_FindObject" c_tchain_findobject ::
                Ptr RawTChain -> CString -> IO (Ptr RawTObject)
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_GetName"
-               c_tchain_getname :: Ptr RawTChain -> IO CString
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_GetName" c_tchain_getname ::
+               Ptr RawTChain -> IO CString
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_IsA"
+foreign import ccall interruptible "HROOTTreeTChain.h TChain_IsA"
                c_tchain_isa :: Ptr RawTChain -> IO (Ptr RawTClass)
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_Paint"
+foreign import ccall interruptible "HROOTTreeTChain.h TChain_Paint"
                c_tchain_paint :: Ptr RawTChain -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_printObj"
-               c_tchain_printobj :: Ptr RawTChain -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_printObj" c_tchain_printobj ::
+               Ptr RawTChain -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_SaveAs"
-               c_tchain_saveas :: Ptr RawTChain -> CString -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_SaveAs" c_tchain_saveas ::
+               Ptr RawTChain -> CString -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_Write"
+foreign import ccall interruptible "HROOTTreeTChain.h TChain_Write"
                c_tchain_write ::
                Ptr RawTChain -> CString -> CInt -> CInt -> IO CInt
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_delete"
-               c_tchain_delete :: Ptr RawTChain -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_Write_" c_tchain_write_ ::
+               Ptr RawTChain -> IO CInt
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_newTChain"
-               c_tchain_newtchain :: CString -> CString -> IO (Ptr RawTChain)
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_delete" c_tchain_delete ::
+               Ptr RawTChain -> IO ()
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_addChain"
-               c_tchain_addchain :: Ptr RawTChain -> Ptr RawTChain -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_newTChain" c_tchain_newtchain ::
+               CString -> CString -> IO (Ptr RawTChain)
 
-foreign import ccall safe "HROOTTreeTChain.h TChain_addChain1"
-               c_tchain_addchain1 :: Ptr RawTChain -> CString -> CLong -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_addChain" c_tchain_addchain ::
+               Ptr RawTChain -> Ptr RawTChain -> IO CInt
+
+foreign import ccall interruptible
+               "HROOTTreeTChain.h TChain_addChain1" c_tchain_addchain1 ::
+               Ptr RawTChain -> CString -> CLong -> IO CInt
diff --git a/src/HROOT/Tree/TChain/Implementation.hs b/src/HROOT/Tree/TChain/Implementation.hs
--- a/src/HROOT/Tree/TChain/Implementation.hs
+++ b/src/HROOT/Tree/TChain/Implementation.hs
@@ -1,17 +1,26 @@
 {-# LANGUAGE EmptyDataDecls, FlexibleContexts, FlexibleInstances,
   ForeignFunctionInterface, IncoherentInstances,
-  MultiParamTypeClasses, OverlappingInstances, TypeFamilies,
-  TypeSynonymInstances #-}
+  MultiParamTypeClasses, OverlappingInstances, TemplateHaskell,
+  TypeFamilies, TypeSynonymInstances #-}
 module HROOT.Tree.TChain.Implementation where
-import FFICXX.Runtime.Cast
+import Data.Monoid
 import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
+import Language.Haskell.TH
+import Language.Haskell.TH.Syntax
 import System.IO.Unsafe
+import FFICXX.Runtime.Cast
+import FFICXX.Runtime.CodeGen.Cxx
+import FFICXX.Runtime.TH
 import HROOT.Tree.TChain.RawType
 import HROOT.Tree.TChain.FFI
 import HROOT.Tree.TChain.Interface
 import HROOT.Tree.TChain.Cast
+import HROOT.Tree.TChain.RawType
+import HROOT.Tree.TChain.Cast
+import HROOT.Tree.TChain.Interface
 import HROOT.Tree.TBranch.RawType
 import HROOT.Tree.TBranch.Cast
 import HROOT.Tree.TBranch.Interface
@@ -36,25 +45,25 @@
 import HROOT.Core.TObject.RawType
 import HROOT.Core.TObject.Cast
 import HROOT.Core.TObject.Interface
-import HROOT.Core.Deletable.RawType
-import HROOT.Core.Deletable.Cast
-import HROOT.Core.Deletable.Interface
+import STD.Deletable.RawType
+import STD.Deletable.Cast
+import STD.Deletable.Interface
 
-instance ITChain TChain where
+instance () => ITChain (TChain) where
         addChain = xform1 c_tchain_addchain
         addChain1 = xform2 c_tchain_addchain1
 
-instance ITTree TChain where
+instance () => ITTree (TChain) where
         branch = xform3 c_tchain_branch
         branch1 = xform4 c_tchain_branch1
         fillTree = xform0 c_tchain_filltree
 
-instance ITNamed TChain where
+instance () => ITNamed (TChain) where
         setName = xform1 c_tchain_setname
         setNameTitle = xform2 c_tchain_setnametitle
         setTitle = xform1 c_tchain_settitle
 
-instance ITAttLine TChain where
+instance () => ITAttLine (TChain) where
         getLineColor = xform0 c_tchain_getlinecolor
         getLineStyle = xform0 c_tchain_getlinestyle
         getLineWidth = xform0 c_tchain_getlinewidth
@@ -64,11 +73,11 @@
         setLineStyle = xform1 c_tchain_setlinestyle
         setLineWidth = xform1 c_tchain_setlinewidth
 
-instance ITAttFill TChain where
+instance () => ITAttFill (TChain) where
         setFillColor = xform1 c_tchain_setfillcolor
         setFillStyle = xform1 c_tchain_setfillstyle
 
-instance ITAttMarker TChain where
+instance () => ITAttMarker (TChain) where
         getMarkerColor = xform0 c_tchain_getmarkercolor
         getMarkerStyle = xform0 c_tchain_getmarkerstyle
         getMarkerSize = xform0 c_tchain_getmarkersize
@@ -78,7 +87,8 @@
         setMarkerStyle = xform1 c_tchain_setmarkerstyle
         setMarkerSize = xform1 c_tchain_setmarkersize
 
-instance ITObject TChain where
+instance () => ITObject (TChain) where
+        clear = xform1 c_tchain_clear
         draw = xform1 c_tchain_draw
         findObject = xform1 c_tchain_findobject
         getName = xform0 c_tchain_getname
@@ -87,8 +97,9 @@
         printObj = xform1 c_tchain_printobj
         saveAs = xform2 c_tchain_saveas
         write = xform3 c_tchain_write
+        write_ = xform0 c_tchain_write_
 
-instance IDeletable TChain where
+instance () => IDeletable (TChain) where
         delete = xform0 c_tchain_delete
 
 newTChain ::
diff --git a/src/HROOT/Tree/TChain/Interface.hs b/src/HROOT/Tree/TChain/Interface.hs
--- a/src/HROOT/Tree/TChain/Interface.hs
+++ b/src/HROOT/Tree/TChain/Interface.hs
@@ -4,16 +4,17 @@
   TypeSynonymInstances #-}
 module HROOT.Tree.TChain.Interface where
 import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
 import FFICXX.Runtime.Cast
 import HROOT.Tree.TChain.RawType
 import HROOT.Tree.TTree.Interface
 
-class ITTree a => ITChain a where
+class (ITTree a) => ITChain a where
         addChain :: (ITChain c0, FPtr c0) => a -> c0 -> IO CInt
         
-        addChain1 :: Castable c0 CString => a -> c0 -> CLong -> IO CInt
+        addChain1 :: (Castable c0 CString) => a -> c0 -> CLong -> IO CInt
 
 upcastTChain :: forall a . (FPtr a, ITChain a) => a -> TChain
 upcastTChain h
diff --git a/src/HROOT/Tree/TChain/RawType.hs b/src/HROOT/Tree/TChain/RawType.hs
--- a/src/HROOT/Tree/TChain/RawType.hs
+++ b/src/HROOT/Tree/TChain/RawType.hs
@@ -8,9 +8,9 @@
 data RawTChain
 
 newtype TChain = TChain (Ptr RawTChain)
-               deriving (Eq, Ord, Show)
+                   deriving (Eq, Ord, Show)
 
-instance FPtr TChain where
+instance () => FPtr (TChain) where
         type Raw TChain = RawTChain
         get_fptr (TChain ptr) = ptr
         cast_fptr_to_obj = TChain
diff --git a/src/HROOT/Tree/TH.hs b/src/HROOT/Tree/TH.hs
new file mode 100644
--- /dev/null
+++ b/src/HROOT/Tree/TH.hs
@@ -0,0 +1,12 @@
+{-# LANGUAGE FlexibleContexts, FlexibleInstances,
+  ForeignFunctionInterface, InterruptibleFFI, TemplateHaskell #-}
+module HROOT.Tree.TH () where
+import Data.Char
+import Data.List
+import Data.Monoid
+import Foreign.C.Types
+import Foreign.Ptr
+import Language.Haskell.TH
+import Language.Haskell.TH.Syntax
+import FFICXX.Runtime.CodeGen.Cxx
+import FFICXX.Runtime.TH
diff --git a/src/HROOT/Tree/TTree/Cast.hs b/src/HROOT/Tree/TTree/Cast.hs
--- a/src/HROOT/Tree/TTree/Cast.hs
+++ b/src/HROOT/Tree/TTree/Cast.hs
@@ -8,10 +8,10 @@
 import HROOT.Tree.TTree.RawType
 import HROOT.Tree.TTree.Interface
 
-instance (ITTree a, FPtr a) => Castable a (Ptr RawTTree) where
+instance (ITTree a, FPtr a) => Castable (a) (Ptr RawTTree) where
         cast x f = f (castPtr (get_fptr x))
         uncast x f = f (cast_fptr_to_obj (castPtr x))
 
-instance Castable TTree (Ptr RawTTree) where
+instance () => Castable (TTree) (Ptr RawTTree) where
         cast x f = f (castPtr (get_fptr x))
         uncast x f = f (cast_fptr_to_obj (castPtr x))
diff --git a/src/HROOT/Tree/TTree/FFI.hsc b/src/HROOT/Tree/TTree/FFI.hsc
--- a/src/HROOT/Tree/TTree/FFI.hsc
+++ b/src/HROOT/Tree/TTree/FFI.hsc
@@ -1,116 +1,146 @@
-{-# LANGUAGE ForeignFunctionInterface #-}
+{-# LANGUAGE ForeignFunctionInterface, InterruptibleFFI #-}
 module HROOT.Tree.TTree.FFI where
+import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
 import HROOT.Tree.TTree.RawType
+import HROOT.Tree.TTree.RawType
 import HROOT.Core.TObject.RawType
 import HROOT.Core.TClass.RawType
 import HROOT.Tree.TBranch.RawType
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetName"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_SetName"
                c_ttree_setname :: Ptr RawTTree -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetNameTitle"
-               c_ttree_setnametitle :: Ptr RawTTree -> CString -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetNameTitle" c_ttree_setnametitle ::
+               Ptr RawTTree -> CString -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetTitle"
-               c_ttree_settitle :: Ptr RawTTree -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetTitle" c_ttree_settitle ::
+               Ptr RawTTree -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_GetLineColor"
-               c_ttree_getlinecolor :: Ptr RawTTree -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_GetLineColor" c_ttree_getlinecolor ::
+               Ptr RawTTree -> IO CShort
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_GetLineStyle"
-               c_ttree_getlinestyle :: Ptr RawTTree -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_GetLineStyle" c_ttree_getlinestyle ::
+               Ptr RawTTree -> IO CShort
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_GetLineWidth"
-               c_ttree_getlinewidth :: Ptr RawTTree -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_GetLineWidth" c_ttree_getlinewidth ::
+               Ptr RawTTree -> IO CShort
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_ResetAttLine"
-               c_ttree_resetattline :: Ptr RawTTree -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_ResetAttLine" c_ttree_resetattline ::
+               Ptr RawTTree -> CString -> IO ()
 
-foreign import ccall safe
+foreign import ccall interruptible
                "HROOTTreeTTree.h TTree_SetLineAttributes"
                c_ttree_setlineattributes :: Ptr RawTTree -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetLineColor"
-               c_ttree_setlinecolor :: Ptr RawTTree -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetLineColor" c_ttree_setlinecolor ::
+               Ptr RawTTree -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetLineStyle"
-               c_ttree_setlinestyle :: Ptr RawTTree -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetLineStyle" c_ttree_setlinestyle ::
+               Ptr RawTTree -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetLineWidth"
-               c_ttree_setlinewidth :: Ptr RawTTree -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetLineWidth" c_ttree_setlinewidth ::
+               Ptr RawTTree -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetFillColor"
-               c_ttree_setfillcolor :: Ptr RawTTree -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetFillColor" c_ttree_setfillcolor ::
+               Ptr RawTTree -> CInt -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetFillStyle"
-               c_ttree_setfillstyle :: Ptr RawTTree -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetFillStyle" c_ttree_setfillstyle ::
+               Ptr RawTTree -> CInt -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_GetMarkerColor"
-               c_ttree_getmarkercolor :: Ptr RawTTree -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_GetMarkerColor" c_ttree_getmarkercolor ::
+               Ptr RawTTree -> IO CShort
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_GetMarkerStyle"
-               c_ttree_getmarkerstyle :: Ptr RawTTree -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_GetMarkerStyle" c_ttree_getmarkerstyle ::
+               Ptr RawTTree -> IO CShort
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_GetMarkerSize"
-               c_ttree_getmarkersize :: Ptr RawTTree -> IO CDouble
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_GetMarkerSize" c_ttree_getmarkersize ::
+               Ptr RawTTree -> IO CFloat
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_ResetAttMarker"
-               c_ttree_resetattmarker :: Ptr RawTTree -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_ResetAttMarker" c_ttree_resetattmarker ::
+               Ptr RawTTree -> CString -> IO ()
 
-foreign import ccall safe
+foreign import ccall interruptible
                "HROOTTreeTTree.h TTree_SetMarkerAttributes"
                c_ttree_setmarkerattributes :: Ptr RawTTree -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetMarkerColor"
-               c_ttree_setmarkercolor :: Ptr RawTTree -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetMarkerColor" c_ttree_setmarkercolor ::
+               Ptr RawTTree -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetMarkerStyle"
-               c_ttree_setmarkerstyle :: Ptr RawTTree -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetMarkerStyle" c_ttree_setmarkerstyle ::
+               Ptr RawTTree -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SetMarkerSize"
-               c_ttree_setmarkersize :: Ptr RawTTree -> CInt -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_SetMarkerSize" c_ttree_setmarkersize ::
+               Ptr RawTTree -> CShort -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_Draw"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_Clear"
+               c_ttree_clear :: Ptr RawTTree -> CString -> IO ()
+
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_Draw"
                c_ttree_draw :: Ptr RawTTree -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_FindObject"
-               c_ttree_findobject ::
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_FindObject" c_ttree_findobject ::
                Ptr RawTTree -> CString -> IO (Ptr RawTObject)
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_GetName"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_GetName"
                c_ttree_getname :: Ptr RawTTree -> IO CString
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_IsA" c_ttree_isa
-               :: Ptr RawTTree -> IO (Ptr RawTClass)
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_IsA"
+               c_ttree_isa :: Ptr RawTTree -> IO (Ptr RawTClass)
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_Paint"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_Paint"
                c_ttree_paint :: Ptr RawTTree -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_printObj"
-               c_ttree_printobj :: Ptr RawTTree -> CString -> IO ()
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_printObj" c_ttree_printobj ::
+               Ptr RawTTree -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_SaveAs"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_SaveAs"
                c_ttree_saveas :: Ptr RawTTree -> CString -> CString -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_Write"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_Write"
                c_ttree_write :: Ptr RawTTree -> CString -> CInt -> CInt -> IO CInt
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_delete"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_Write_"
+               c_ttree_write_ :: Ptr RawTTree -> IO CInt
+
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_delete"
                c_ttree_delete :: Ptr RawTTree -> IO ()
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_newTTree"
-               c_ttree_newttree :: CString -> CString -> CInt -> IO (Ptr RawTTree)
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_newTTree" c_ttree_newttree ::
+               CString -> CString -> CInt -> IO (Ptr RawTTree)
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_Branch"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_Branch"
                c_ttree_branch ::
                Ptr RawTTree -> CString -> CInt -> CInt -> IO CInt
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_branch1"
+foreign import ccall interruptible "HROOTTreeTTree.h TTree_branch1"
                c_ttree_branch1 ::
                Ptr RawTTree ->
-                 CString -> (Ptr ()) -> CString -> CInt -> IO (Ptr RawTBranch)
+                 CString -> Ptr () -> CString -> CInt -> IO (Ptr RawTBranch)
 
-foreign import ccall safe "HROOTTreeTTree.h TTree_fillTree"
-               c_ttree_filltree :: Ptr RawTTree -> IO CInt
+foreign import ccall interruptible
+               "HROOTTreeTTree.h TTree_fillTree" c_ttree_filltree ::
+               Ptr RawTTree -> IO CInt
diff --git a/src/HROOT/Tree/TTree/Implementation.hs b/src/HROOT/Tree/TTree/Implementation.hs
--- a/src/HROOT/Tree/TTree/Implementation.hs
+++ b/src/HROOT/Tree/TTree/Implementation.hs
@@ -1,17 +1,26 @@
 {-# LANGUAGE EmptyDataDecls, FlexibleContexts, FlexibleInstances,
   ForeignFunctionInterface, IncoherentInstances,
-  MultiParamTypeClasses, OverlappingInstances, TypeFamilies,
-  TypeSynonymInstances #-}
+  MultiParamTypeClasses, OverlappingInstances, TemplateHaskell,
+  TypeFamilies, TypeSynonymInstances #-}
 module HROOT.Tree.TTree.Implementation where
-import FFICXX.Runtime.Cast
+import Data.Monoid
 import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
+import Language.Haskell.TH
+import Language.Haskell.TH.Syntax
 import System.IO.Unsafe
+import FFICXX.Runtime.Cast
+import FFICXX.Runtime.CodeGen.Cxx
+import FFICXX.Runtime.TH
 import HROOT.Tree.TTree.RawType
 import HROOT.Tree.TTree.FFI
 import HROOT.Tree.TTree.Interface
 import HROOT.Tree.TTree.Cast
+import HROOT.Tree.TTree.RawType
+import HROOT.Tree.TTree.Cast
+import HROOT.Tree.TTree.Interface
 import HROOT.Core.TClass.RawType
 import HROOT.Core.TClass.Cast
 import HROOT.Core.TClass.Interface
@@ -33,21 +42,21 @@
 import HROOT.Core.TObject.RawType
 import HROOT.Core.TObject.Cast
 import HROOT.Core.TObject.Interface
-import HROOT.Core.Deletable.RawType
-import HROOT.Core.Deletable.Cast
-import HROOT.Core.Deletable.Interface
+import STD.Deletable.RawType
+import STD.Deletable.Cast
+import STD.Deletable.Interface
 
-instance ITTree TTree where
+instance () => ITTree (TTree) where
         branch = xform3 c_ttree_branch
         branch1 = xform4 c_ttree_branch1
         fillTree = xform0 c_ttree_filltree
 
-instance ITNamed TTree where
+instance () => ITNamed (TTree) where
         setName = xform1 c_ttree_setname
         setNameTitle = xform2 c_ttree_setnametitle
         setTitle = xform1 c_ttree_settitle
 
-instance ITAttLine TTree where
+instance () => ITAttLine (TTree) where
         getLineColor = xform0 c_ttree_getlinecolor
         getLineStyle = xform0 c_ttree_getlinestyle
         getLineWidth = xform0 c_ttree_getlinewidth
@@ -57,11 +66,11 @@
         setLineStyle = xform1 c_ttree_setlinestyle
         setLineWidth = xform1 c_ttree_setlinewidth
 
-instance ITAttFill TTree where
+instance () => ITAttFill (TTree) where
         setFillColor = xform1 c_ttree_setfillcolor
         setFillStyle = xform1 c_ttree_setfillstyle
 
-instance ITAttMarker TTree where
+instance () => ITAttMarker (TTree) where
         getMarkerColor = xform0 c_ttree_getmarkercolor
         getMarkerStyle = xform0 c_ttree_getmarkerstyle
         getMarkerSize = xform0 c_ttree_getmarkersize
@@ -71,7 +80,8 @@
         setMarkerStyle = xform1 c_ttree_setmarkerstyle
         setMarkerSize = xform1 c_ttree_setmarkersize
 
-instance ITObject TTree where
+instance () => ITObject (TTree) where
+        clear = xform1 c_ttree_clear
         draw = xform1 c_ttree_draw
         findObject = xform1 c_ttree_findobject
         getName = xform0 c_ttree_getname
@@ -80,8 +90,9 @@
         printObj = xform1 c_ttree_printobj
         saveAs = xform2 c_ttree_saveas
         write = xform3 c_ttree_write
+        write_ = xform0 c_ttree_write_
 
-instance IDeletable TTree where
+instance () => IDeletable (TTree) where
         delete = xform0 c_ttree_delete
 
 newTTree ::
diff --git a/src/HROOT/Tree/TTree/Interface.hs b/src/HROOT/Tree/TTree/Interface.hs
--- a/src/HROOT/Tree/TTree/Interface.hs
+++ b/src/HROOT/Tree/TTree/Interface.hs
@@ -4,6 +4,7 @@
   TypeSynonymInstances #-}
 module HROOT.Tree.TTree.Interface where
 import Data.Word
+import Data.Int
 import Foreign.C
 import Foreign.Ptr
 import FFICXX.Runtime.Cast
@@ -16,13 +17,14 @@
 
 class (ITNamed a, ITAttLine a, ITAttFill a, ITAttMarker a) =>
       ITTree a where
-        branch :: Castable c0 CString => a -> c0 -> CInt -> CInt -> IO CInt
+        branch ::
+                 (Castable c0 CString) => a -> c0 -> CInt -> CInt -> IO CInt
         
         branch1 ::
                   (Castable c1 CString, Castable c0 CString) =>
-                  a -> c0 -> (Ptr ()) -> c1 -> CInt -> IO TBranch
+                  a -> c0 -> Ptr () -> c1 -> CInt -> IO TBranch
         
-        fillTree :: a -> IO CInt
+        fillTree :: () => a -> IO CInt
 
 upcastTTree :: forall a . (FPtr a, ITTree a) => a -> TTree
 upcastTTree h
diff --git a/src/HROOT/Tree/TTree/RawType.hs b/src/HROOT/Tree/TTree/RawType.hs
--- a/src/HROOT/Tree/TTree/RawType.hs
+++ b/src/HROOT/Tree/TTree/RawType.hs
@@ -8,9 +8,9 @@
 data RawTTree
 
 newtype TTree = TTree (Ptr RawTTree)
-              deriving (Eq, Ord, Show)
+                  deriving (Eq, Ord, Show)
 
-instance FPtr TTree where
+instance () => FPtr (TTree) where
         type Raw TTree = RawTTree
         get_fptr (TTree ptr) = ptr
         cast_fptr_to_obj = TTree
diff --git a/src/HROOT/Tree/Template.hs b/src/HROOT/Tree/Template.hs
new file mode 100644
--- /dev/null
+++ b/src/HROOT/Tree/Template.hs
@@ -0,0 +1,7 @@
+{-# LANGUAGE EmptyDataDecls, FlexibleInstances,
+  ForeignFunctionInterface, InterruptibleFFI, MultiParamTypeClasses,
+  TypeFamilies #-}
+module HROOT.Tree.Template () where
+import Foreign.C.Types
+import Foreign.Ptr
+import FFICXX.Runtime.Cast
