Definition

"modify_type" transformer changes type of the function argument.

"modify_type" transformer takes two arguments:

1. name or index of the original function argument
2. a callable, which takes as argument reference to type and returns new type

New in version greater than 0.8.5.

Example

#include <string>

inline void hello_world( std::string& hw ){
    hw = "hello world!";
}

Lets say that you need to expose hello_world function. As you know std::string is mapped to Python string, which is immutable type, so you have to create small wrapper for the function. Next Py++ code does it for you:

from pygccxml import declarations
from pyplusplus import module_builder
from pyplusplus import function_transformers as FT

mb = module_builder.module_builder_t( ... )
hw = mb.mem_fun( 'hello_world' )
hw.add_transformation( FT.modify_type(0, declarations.remove_reference) )

What you see below is the relevant pieces of generated code:

namespace bp = boost::python;

static void hello_world_a3478182294a057b61508c30b1361318( ::std::string hw ){
    ::hello_world(hw);
}

BOOST_PYTHON_MODULE(...){
    ...
    bp::def( "hello_world", &hello_world_a3478182294a057b61508c30b1361318 );
}