Package pyplusplus :: Package decl_wrappers :: Module python_traits

# Source Code for Module pyplusplus.decl_wrappers.python_traits

     1  # Copyright 2004-2008 Roman Yakovenko.
     2  # Distributed under the Boost Software License, Version 1.0. (See
     3  # accompanying file LICENSE_1_0.txt or copy at
     4  # http://www.boost.org/LICENSE_1_0.txt)
     5
     6  """defines few "type traits" functions related to C++ Python bindings"""
     7
     8  from pygccxml import declarations
     9
    10 -def is_immutable( type_ ):
    11      """returns True, if type_ represents Python immutable type"""
    12      return declarations.is_fundamental( type_ )      \
    13             or declarations.is_enum( type_ )          \
    14             or declarations.is_std_string( type_ )    \
    15             or declarations.is_std_wstring( type_ )   \
    16             or declarations.smart_pointer_traits.is_smart_pointer( type_ )
    17             #todo is_complex, ...
    18
    19 -def call_traits( type_ ):
    20      """http://boost.org/libs/utility/call_traits.htm"""
    21      type_ = declarations.remove_alias( type_ )
    22      if is_immutable( type_ ):
    23          return "%s" #pass by value
    24      elif declarations.is_reference( type_ ):
    25          no_ref = declarations.remove_reference( type_ )
    26          if is_immutable( no_ref ):
    27              return "%s" #pass by value
    28          else:
    29              return "boost::ref(%s)" #pass by ref
    30      elif declarations.is_pointer( type_ ) \
    31           and not is_immutable( type_.base ) \
    32           and not declarations.is_pointer( type_.base ):
    33          return "boost::python::ptr(%s)" #pass by ptr
    34      else:
    35          return "%s" #pass by value
    36