diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b517fd8..dff351ba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -350,6 +350,9 @@ set(TRIQS_LINK_LIBS
 # General include header
 # remove this dep to C++
 include_directories(${TRIQS_SOURCE_DIR})
+# for the generated headers for python convertions
+include_directories(${CMAKE_BINARY_DIR}/include/)
+# Add it to triqs definitions
 
 #--------------------------------
 # General C++ compilation flags
diff --git a/cmake/FindPythonWrapperMacro.cmake b/cmake/FindPythonWrapperMacro.cmake
index 4418e93b..bac2164a 100644
--- a/cmake/FindPythonWrapperMacro.cmake
+++ b/cmake/FindPythonWrapperMacro.cmake
@@ -6,21 +6,20 @@ include_directories(${PYTHON_INCLUDE_DIRS} ${PYTHON_NUMPY_INCLUDE_DIR})
 # ModuleName = the python name of the module 
 # ModuleDest = path in the pytriqs tree [ FOR INSTALLATION ONLY] IMPROVE MAKE THIS OPTIONAL (for test) 
 
-#EXECUTE_PROCESS(COMMAND mkdir -p ${CMAKE_BINARY_DIR}/pytriqs/converters/)
+EXECUTE_PROCESS(COMMAND mkdir -p ${CMAKE_BINARY_DIR}/include/pytriqs/converters/)
 include_directories( ${CMAKE_BINARY_DIR}) 
 
 macro (triqs_python_extension ModuleName)
  message(STATUS "Preparing extension module ${ModuleName}")
 
  SET(wrap_name  ${CMAKE_CURRENT_BINARY_DIR}/${ModuleName}_wrap.cpp)
- SET(converter_name  ${CMAKE_CURRENT_BINARY_DIR}/${ModuleName}_converter.cpp)
+ SET(converter_name  ${CMAKE_BINARY_DIR}/include/pytriqs/converters/${ModuleName}.hpp)
 
  # Adjust pythonpath so that pytriqs is visible and the wrap_generator too...
  # pytriqs needed since we import modules with pure python method to extract the doc.. 
  add_custom_command(OUTPUT ${wrap_name} ${converter_name} DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${ModuleName}_desc.py 
   COMMAND PYTHONPATH=${CMAKE_BINARY_DIR}/pytriqs/wrap_generator:${CMAKE_BINARY_DIR}/ ${PYTHON_INTERPRETER} ${CMAKE_CURRENT_BINARY_DIR}/${ModuleName}_desc.py ${CMAKE_SOURCE_DIR}/pytriqs/wrap_generator/wrapper.mako.cpp ${wrap_name} ${CMAKE_SOURCE_DIR}/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp ${converter_name} )
 
- set_property (GLOBAL APPEND PROPERTY TRIQS_PY_CONVERTERS_CPP_LIST "${CMAKE_CURRENT_BINARY_DIR}/${ModuleName}_converter.cpp")
  set_property (GLOBAL APPEND PROPERTY TRIQS_PY_CONVERTERS_TARGETS "python_wrap_${ModuleName}")
  
  add_custom_target(python_wrap_${ModuleName} ALL DEPENDS ${wrap_name} ${converter_name})
@@ -33,6 +32,7 @@ macro (triqs_python_extension ModuleName)
  target_link_libraries(${ModuleName} ${TRIQS_LINK_LIBS} triqs)
  
  if (${ARGN} MATCHES "")
+   install (FILES ${converter_name} DESTINATION "include/pytriqs/converters")
    install (TARGETS ${ModuleName} DESTINATION ${TRIQS_PYTHON_LIB_DEST}/${ARGN}  )
  endif (${ARGN} MATCHES "")
  #set_property (GLOBAL APPEND PROPERTY DEPENDANCE_TO_ADD triqs_${NickName} )
diff --git a/pytriqs/CMakeLists.txt b/pytriqs/CMakeLists.txt
index 8c003394..5e264846 100644
--- a/pytriqs/CMakeLists.txt
+++ b/pytriqs/CMakeLists.txt
@@ -1,4 +1,4 @@
-option(Python_use_mpi4py "Use mpi4py instead of boost.mpi" OFF)
+option(Python_use_mpi4py "Use mpi4py (if OFF, use boost.mpi)" OFF)
 if (Python_use_mpi4py) 
  SET (TRIQS_PYTHON_MPI_USE_MPI4PY 1)
 else()
diff --git a/pytriqs/gf/local/CMakeLists.txt b/pytriqs/gf/local/CMakeLists.txt
index 250b1052..f1589735 100644
--- a/pytriqs/gf/local/CMakeLists.txt
+++ b/pytriqs/gf/local/CMakeLists.txt
@@ -2,15 +2,15 @@
 SET(PYTHON_SOURCES 
   ${CMAKE_CURRENT_SOURCE_DIR}/__init__.py
   ${CMAKE_CURRENT_SOURCE_DIR}/block_gf.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/descriptor_base.py
   ${CMAKE_CURRENT_SOURCE_DIR}/descriptors.py
-  ${CMAKE_CURRENT_SOURCE_DIR}/gf_generic.py
-  ${CMAKE_CURRENT_SOURCE_DIR}/gf_imfreq.py
-  ${CMAKE_CURRENT_SOURCE_DIR}/gf_imtime.py
-  ${CMAKE_CURRENT_SOURCE_DIR}/gf_legendre.py
-  ${CMAKE_CURRENT_SOURCE_DIR}/gf_refreq.py
-  ${CMAKE_CURRENT_SOURCE_DIR}/gf_retime.py
-  ${CMAKE_CURRENT_SOURCE_DIR}/gf_two_real_times.py
-  ${CMAKE_CURRENT_SOURCE_DIR}/impl_plot.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/_gf_imfreq.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/_gf_imtime.py
+  #${CMAKE_CURRENT_SOURCE_DIR}/_gf_legendre.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/_gf_refreq.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/_gf_retime.py
+  #${CMAKE_CURRENT_SOURCE_DIR}/gf_two_real_times.py
+  ${CMAKE_CURRENT_SOURCE_DIR}/_gf_plot.py
   ${CMAKE_CURRENT_SOURCE_DIR}/inverse.py
   ${CMAKE_CURRENT_SOURCE_DIR}/lazy_expressions.py
   ${CMAKE_CURRENT_SOURCE_DIR}/tools.py
diff --git a/pytriqs/gf/local/gf_desc.py b/pytriqs/gf/local/gf_desc.py
index 98f68729..3990a2e5 100644
--- a/pytriqs/gf/local/gf_desc.py
+++ b/pytriqs/gf/local/gf_desc.py
@@ -1,7 +1,6 @@
 from wrap_generator import *
 
 module = module_(full_name = "pytriqs.gf.local.gf", doc = "Local Green functions ...")
-module.add_include("<typeindex>")
 module.add_include("<triqs/gfs.hpp>")
 module.add_include("<triqs/gfs/local/functions.hpp>")
 module.add_include("<triqs/gfs/local/pade.hpp>")
@@ -16,6 +15,7 @@ module.add_using("triqs::utility::mini_vector")
 
 t = class_( py_type = "TailGf",
         c_type = "local::tail_view",
+        c_type_absolute = "triqs::gfs::local::tail_view",
         serializable= "tuple",
         is_printable= True,
         arithmetic = ("algebra","double")
@@ -85,9 +85,11 @@ module.add_class(t)
 ########################
 
 module.add_enum(c_name = "statistic_enum",
+                c_name_absolute = "triqs::gfs::statistic_enum",
                 values = ["Fermion","Boson"])
 
 module.add_enum(c_name = "mesh_kind",
+                c_name_absolute = "triqs::gfs::mesh_kind",
                 values = ["half_bins","full_bins","without_last"])
 
 ########################
@@ -97,6 +99,7 @@ module.add_enum(c_name = "mesh_kind",
 def make_mesh( py_type, c_tag, has_kind=True, is_im=False) :
     m = class_( py_type = py_type,
             c_type = "gf_mesh<%s>"%c_tag,
+            c_type_absolute = "triqs::gfs::gf_mesh<triqs::gfs::%s>"%c_tag,
             serializable= "tuple",
             is_printable= True,
            )
@@ -196,6 +199,7 @@ def make_gf( py_type, c_tag, is_complex_data = True, is_im = False) :
     g = class_(
             py_type = py_type,
             c_type = "gf_view<%s>"%c_tag,
+            c_type_absolute = "triqs::gfs::gf_view<triqs::gfs::%s>"%c_tag,
             #serializable= "boost",
             serializable= "tuple",
             is_printable= True,
@@ -306,10 +310,6 @@ def make_gf( py_type, c_tag, is_complex_data = True, is_im = False) :
     # Pure python methods
     g.add_pure_python_method("pytriqs.gf.local._gf_%s.plot"%c_tag, py_name = "_plot_")
 
-    g.add_method(py_name = "_as_C_pointer", 
-                 calling_pattern = 'auto result = PyCapsule_New(new std::pair<void *,std::type_index>(&self_c,typeid(self_c)),NULL,NULL)',
-                 signature = "PyObject*()")
-
     return g
 
 ########################
diff --git a/pytriqs/parameters/parameters_desc.py b/pytriqs/parameters/parameters_desc.py
index 1c6cc470..dfd26120 100644
--- a/pytriqs/parameters/parameters_desc.py
+++ b/pytriqs/parameters/parameters_desc.py
@@ -1,7 +1,7 @@
 from wrap_generator import *
 
 # The module
-module = module_(full_name = "pytriqs.parameters.parameters.my_module", doc = " Doc of my_module ")
+module = module_(full_name = "pytriqs.parameters.parameters", doc = "TO BE WRITTEN")
 module.add_include("<triqs/parameters/parameters.hpp>")
 module.add_include("<triqs/utility/formatted_output.hpp>")
 module.add_using("namespace triqs::params")
@@ -9,7 +9,7 @@ module.add_using("namespace triqs::params")
 # one class
 g = class_(
         py_type = "Parameters",
-        c_type = "parameters",
+        c_type = "triqs::params::parameters",
         #serializable= "tuple",
         is_printable= True,
         hdf5 = True,
diff --git a/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp b/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
index 429fc170..b55ea440 100644
--- a/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
+++ b/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
@@ -1,5 +1,8 @@
 // Specialization of py_converter to types wrapped by the wrap_generator.
 // DO NOT EDIT. Generated automatically by wrap_generator
+#pragma once
+// in case it is included in the module ${module.full_name}.so, we do not want this specialization
+#ifndef TRIQS_PYTHON_WRAPPER_MODULE_${module.name}
 
 %for file in module.include_list :
 %if file.startswith('<'):
@@ -9,39 +12,34 @@
 %endif
 %endfor
 
-using dcomplex = std::complex<double>;
-
-%for ns in module.using:
-using ${ns};
-%endfor
-
-//#include <triqs/arrays.hpp>
 #include <triqs/python_tools/wrapper_tools.hpp>
 
 namespace triqs { namespace py_tools { 
 
-%for n,t in enumerate(module.wrapped_types_by_me) :
+%for n,c in enumerate(module.classes.values()) :
 
- template<> void ** py_converter<${t}>::init() {
+template<> struct py_converter<${c.c_type_absolute}> { 
+
+  static void ** init() {
    PyObject * mod =  PyImport_ImportModule("${module.full_name}");
    if (mod ==NULL) return NULL;
    void ** table = (void **)PyCapsule_Import("${module.full_name}._exported_wrapper_convert_fnt", 0);
    return table;
  }
  
- template<> PyObject * py_converter<${t}>::c2py(${t} const & x){
+  static PyObject * c2py(${c.c_type_absolute} const & x){
    static void **wrapped_convert_fnt = init();
    if (wrapped_convert_fnt == NULL) return NULL;
-   return ((PyObject * (*)(${t} const &)) wrapped_convert_fnt[3*${n}])(x);
+   return ((PyObject * (*)(${c.c_type_absolute} const &)) wrapped_convert_fnt[3*${n}])(x);
  }
  
- template<> ${t}& py_converter<${t}>::py2c(PyObject * ob){
+  static ${c.c_type_absolute}& py2c(PyObject * ob){
    static void **wrapped_convert_fnt = init();
    if (wrapped_convert_fnt == NULL) std::terminate(); // It should never happen since py2c is called only is is_convertible is true (py_converter specs) 
-   return ((${t}& (*)(PyObject *)) wrapped_convert_fnt[3*${n}+1])(ob);
+   return ((${c.c_type_absolute}& (*)(PyObject *)) wrapped_convert_fnt[3*${n}+1])(ob);
  }
  
- template<> bool py_converter<${t}>::is_convertible(PyObject *ob, bool raise_exception) {
+  static bool is_convertible(PyObject *ob, bool raise_exception) {
    static void **wrapped_convert_fnt = init();
    if (wrapped_convert_fnt == NULL) {
     if (!raise_exception && PyErr_Occurred()) {PyErr_Print();PyErr_Clear();}
@@ -49,6 +47,65 @@ namespace triqs { namespace py_tools {
    }
    return ((bool (*)(PyObject *,bool)) wrapped_convert_fnt[3*${n}+2])(ob,raise_exception);
  }
-%endfor
-}}
+};
 
+%endfor
+
+//--------------------- Converters of regular types --------------------------
+
+%for c in module.classes.values() :
+
+ %if c.implement_regular_type_converter : 
+ // ${c.py_type} is wrapping a view, we are also implementing the converter of the associated regular type
+ template<> struct py_converter<${c.regular_type_absolute}> {
+ using regular_type = ${c.regular_type_absolute};
+ using conv = py_converter<${c.c_type_absolute}>;
+ static PyObject *c2py(regular_type &g) { return conv::c2py(g); }
+ static PyObject *c2py(regular_type &&g) { return conv::c2py(g); }
+ static bool is_convertible(PyObject * ob, bool raise_exception) { return conv::is_convertible(ob, raise_exception); }
+ static regular_type py2c(PyObject *ob) { return conv::py2c(ob); }
+};
+%endif
+%endfor
+//--------------------- Converters of enums --------------------------
+
+%for en in module.enums :
+
+namespace triqs { namespace py_tools { 
+
+template <> struct py_converter<${en.c_name_absolute}> {
+ static PyObject * c2py(${en.c_name_absolute} x) {
+   %for n,val in enumerate(en.values[:-1]) :
+    if (x == ${val}) return PyString_FromString("${val}");
+   %endfor
+   return PyString_FromString("${en.values[-1]}"); // last case separate to avoid no return warning of compiler
+ }
+ static ${en.c_name_absolute} py2c(PyObject * ob){
+   std::string s=PyString_AsString(ob);
+   %for n,val in enumerate(en.values[:-1]) :
+    if (s == "${val}") return ${val};
+   %endfor
+   return ${en.values[-1]};
+ }
+ static bool is_convertible(PyObject *ob, bool raise_exception) {
+   if (!PyString_Check(ob))  {
+     if (raise_exception) PyErr_SetString(PyExc_ValueError, "Convertion of C++ enum ${en.c_name_absolute} : the object is not a string");
+     return false;
+   }
+   std::string s=PyString_AsString(ob);
+   %for n,val in enumerate(en.values) :
+    if (s == "${val}") return true;
+   %endfor
+   if (raise_exception) {
+    auto err = "Convertion of C++ enum ${en.c_name_absolute} : \nThe string \"" + s +"\" is not in [${','.join([str(x) for x in en.values])}]";
+    PyErr_SetString(PyExc_ValueError, err.c_str());
+   }
+   return false;
+ }
+};
+
+}}
+%endfor
+
+}}
+#endif
diff --git a/pytriqs/wrap_generator/wrap_generator.py b/pytriqs/wrap_generator/wrap_generator.py
index b06d34e1..af73a883 100644
--- a/pytriqs/wrap_generator/wrap_generator.py
+++ b/pytriqs/wrap_generator/wrap_generator.py
@@ -235,6 +235,8 @@ class class_ :
        Representation of a wrapped type
        Data :
         - c_type : C++ type to be wrapped.
+        - c_type_absolute : full path of c_type, no using, no alias (need for
+          the py_converter hpp file)
         - py_type : Name given in Python
         - doc : the doc string.
         - c_type_is_view : boolean
@@ -244,11 +246,14 @@ class class_ :
         - members : a dict : string -> member_
     """
     hidden_python_function = {} # global dict of the python function to add to the module, hidden for the user, for precompute and so on
-    def __init__(self, c_type, py_type, hdf5 = False, arithmetic = None, serializable = None, is_printable = False, doc = '' ) :
+    def __init__(self, c_type, py_type, c_type_absolute = None, hdf5 = False, arithmetic = None, serializable = None, is_printable = False, doc = '' ) :
       self.c_type = c_type
+      self.c_type_absolute = c_type_absolute or c_type
       self.c_type_is_view = is_type_a_view(c_type)
       self.implement_regular_type_converter = self.c_type_is_view # by default, it will also make the converter of the associated regular type
-      if self.c_type_is_view : self.regular_type = 'typename ' +  self.c_type + '::regular_type'
+      if self.c_type_is_view : 
+          self.regular_type = 'typename ' +  self.c_type + '::regular_type'
+          self.regular_type_absolute = 'typename ' +  self.c_type_absolute  + '::regular_type'
       self.py_type = py_type
       c_to_py_type[self.c_type] = self.py_type # register the name translation for the doc generation
       self.hdf5 = hdf5
@@ -420,8 +425,8 @@ class enum_ :
         - values : list of string representing the enumerated
         - doc : the doc string.
     """
-    def __init__(self, c_name, values, doc = '') : 
-      self.c_name, self.values, self.doc = c_name, values, doc
+    def __init__(self, c_name, values, c_name_absolute = None, doc = '') : 
+      self.c_name, self.c_name_absolute, self.values, self.doc = c_name, c_name_absolute or c_name, values, doc
  
 class module_ :
     """
@@ -443,7 +448,6 @@ class module_ :
       self.classes = {}
       self.functions = {}
       self.include_list = []
-      self.wrapped_types_by_me = {}
       self.enums = []
       self.using =[]
       self.python_functions = {}
@@ -452,8 +456,8 @@ class module_ :
     def add_class(self, cls):
         if cls.py_type in self.classes : raise IndexError, "The class %s already exists"%cls.py_type
         self.classes[cls.py_type] = cls
-        self.wrapped_types[cls.c_type] = cls.py_type
-        self.wrapped_types_by_me[cls.c_type] = cls.py_type
+        self.wrapped_types[cls.c_type] = cls
+        self.wrapped_types[cls.c_type_absolute] = cls # we can call is by its name or its absolute name
 
     def add_function(self, **kw):
         if "name" in kw :
diff --git a/pytriqs/wrap_generator/wrapper.mako.cpp b/pytriqs/wrap_generator/wrapper.mako.cpp
index c68b9431..b8952a4d 100644
--- a/pytriqs/wrap_generator/wrapper.mako.cpp
+++ b/pytriqs/wrap_generator/wrapper.mako.cpp
@@ -1,4 +1,5 @@
 //--------------------- includes and using  -------------------------------------
+#define TRIQS_PYTHON_WRAPPER_MODULE_${module.name}
 
 %for file in module.include_list :
 %if file.startswith('<'):
@@ -966,15 +967,15 @@ init${module.name}(void)
     register_h5_reader_for_${c.py_type}();
 %endfor
 
-%if len(module.wrapped_types_by_me) >0 :
+%if len(module.classes) >0 :
      // declare the exported wrapper functions
-     static void * _exported_wrapped_convert_fnt[3*${len(module.wrapped_types_by_me)}];
+     static void * _exported_wrapped_convert_fnt[3*${len(module.classes)}];
 
      // init the array with the function pointers
-     %for n,t in enumerate(module.wrapped_types_by_me) :
-       _exported_wrapped_convert_fnt[3*${n}] = (void *)convert_to_python<${t}>;
-       _exported_wrapped_convert_fnt[3*${n}+1] = (void *)convert_from_python<${t}>;
-       _exported_wrapped_convert_fnt[3*${n}+2] = (void *)convertible_from_python<${t}>;
+     %for n,c in enumerate(module.classes.values()) :
+       _exported_wrapped_convert_fnt[3*${n}] = (void *)convert_to_python<${c.c_type_absolute}>;
+       _exported_wrapped_convert_fnt[3*${n}+1] = (void *)convert_from_python<${c.c_type_absolute}>;
+       _exported_wrapped_convert_fnt[3*${n}+2] = (void *)convertible_from_python<${c.c_type_absolute}>;
      %endfor
 
     /* Create a Capsule containing the API pointer array's address */
diff --git a/pytriqs/wrap_test/a.hpp b/pytriqs/wrap_test/a.hpp
index 221bb0eb..3a88c2ef 100644
--- a/pytriqs/wrap_test/a.hpp
+++ b/pytriqs/wrap_test/a.hpp
@@ -1,3 +1,4 @@
+#pragma once
 #include <iostream>
 #include <vector>
 #include <ostream>
diff --git a/pytriqs/wrap_test/b.hpp b/pytriqs/wrap_test/b.hpp
index 7be6003c..b80ed867 100644
--- a/pytriqs/wrap_test/b.hpp
+++ b/pytriqs/wrap_test/b.hpp
@@ -1,3 +1,4 @@
+#pragma once
 #include "./a.hpp"
 
 /// some function using A
diff --git a/pytriqs/wrap_test/my_moduleB_desc.py b/pytriqs/wrap_test/my_moduleB_desc.py
index ff115353..88473050 100644
--- a/pytriqs/wrap_test/my_moduleB_desc.py
+++ b/pytriqs/wrap_test/my_moduleB_desc.py
@@ -3,6 +3,7 @@ from wrap_generator import *
 # The module
 mod = module_(full_name = "pytriqs.wrap_test.my_moduleB", doc = " Doc of my_module ")
 mod.add_include("<triqs/../pytriqs/wrap_test/b.hpp>") 
+mod.add_include("<pytriqs/converters/my_module.hpp>")
 
 mod.add_function (name = "print_a2", signature = "void(A a)", doc = "DOC of print_a")
 
diff --git a/triqs/CMakeLists.txt b/triqs/CMakeLists.txt
index 1f2de960..f6f408be 100644
--- a/triqs/CMakeLists.txt
+++ b/triqs/CMakeLists.txt
@@ -5,18 +5,6 @@ FOREACH(CPP ${ALLSOURCES})
 ENDFOREACH(CPP ${ALLSOURCES})
 get_property(ALLSOURCES GLOBAL PROPERTY TRIQS_LIB_CPP_SOURCES_LIST)
 
-## The library also contains all the converters python <-> C++ 
-## automatically generated for all wrapped modules.
-## The lists are defined in subdirectory, in each module
-## NB : pytriqs subdir is and must be called BEFORE triqs, or these lists are empty
-get_property(all_py_converters_sources GLOBAL PROPERTY TRIQS_PY_CONVERTERS_CPP_LIST)
-get_property(all_py_converters_targets GLOBAL PROPERTY TRIQS_PY_CONVERTERS_TARGETS)
-
-# All files are generated, cmake should not worry not to see them at configuration time
-foreach(CPP ${all_py_converters_sources})
- set_source_files_properties(${CPP} PROPERTIES GENERATED TRUE)
-endforeach()
-
 # compile every subdirectory
 add_all_subdirectories_with_cmakelist()
 
@@ -30,7 +18,8 @@ add_library(triqs ${ALLSOURCES} ${all_py_converters_sources})
 target_link_libraries (triqs ${LINK_RT} ${TRIQS_LINK_LIBS}  )
 
 # The TRIQS library depends on the generation of the .cpp wrapper and converters files
-# which must be produced first.
+# which are produced first.
+get_property(all_py_converters_targets GLOBAL PROPERTY TRIQS_PY_CONVERTERS_TARGETS)
 foreach(T ${all_py_converters_targets})
  add_dependencies(triqs ${T})
 endforeach()
diff --git a/triqs/mc_tools/mc_generic.hpp b/triqs/mc_tools/mc_generic.hpp
index 22a8e80f..3f5806a1 100644
--- a/triqs/mc_tools/mc_generic.hpp
+++ b/triqs/mc_tools/mc_generic.hpp
@@ -60,7 +60,7 @@ namespace triqs { namespace mc_tools {
      * \param[in] P  dictionary parameters
      * \param[in] AfterCycleDuty  a function bool() to be called after each QMC cycle
      */
-     mc_generic(utility::parameters const & P, std::function<bool()> AfterCycleDuty = std::function<bool()>() ) :
+     mc_generic(params::parameters const & P, std::function<bool()> AfterCycleDuty = std::function<bool()>() ) :
       RandomGenerator(std::string(P["random_name"]), long(P["random_seed"])),
       report(&std::cout,int(P["verbosity"])),
       AllMoves(RandomGenerator),
diff --git a/triqs/parameters/parameters.hpp b/triqs/parameters/parameters.hpp
index 152aadd6..8344132b 100644
--- a/triqs/parameters/parameters.hpp
+++ b/triqs/parameters/parameters.hpp
@@ -20,6 +20,7 @@
  ******************************************************************************/
 #pragma once
 #include "./_field.hpp"
+
 namespace triqs {
 namespace params {
 
@@ -100,7 +101,6 @@ namespace params {
   p1.update(p2);
   return p1;
  }
-
  // can only be implemented after complete declaration of parameters
  template <typename... T> _field& _field::add_field(T&&... x) {
   auto* pp = dynamic_cast<_data_impl<parameters>*>(p.get());
@@ -108,7 +108,6 @@ namespace params {
   pp->x.add_field(std::forward<T>(x)...);
   return *this;
  }
-
-
 }
 }
+#include <pytriqs/converters/parameters.hpp>
diff --git a/triqs/python_tools/wrapper_tools.hpp b/triqs/python_tools/wrapper_tools.hpp
index 0bfdb3c8..ed331dfe 100644
--- a/triqs/python_tools/wrapper_tools.hpp
+++ b/triqs/python_tools/wrapper_tools.hpp
@@ -57,12 +57,11 @@ class pyref {
 //---------------------  py_converters -----------------------------
 
 // default version for a wrapped type. To be specialized later.
-template<typename T> struct py_converter {
- static void ** init();
- static PyObject * c2py(T const & x);
- static T & py2c(PyObject * ob);
- static bool is_convertible(PyObject * ob, bool raise_exception);
-};
+template<typename T> struct py_converter;
+ //static PyObject * c2py(T const & x);
+ //static T & py2c(PyObject * ob);
+ //static bool is_convertible(PyObject * ob, bool raise_exception);
+ //
 
 // We only use these functions in the code, not converter
 // TODO : Does c2py return NULL in failure ? Or is it undefined...