input_static_array transformer


“input_static_array” transformer works on native static arrays. It handles the translation between Python object, passed as argument that represent a sequence, and the array. Size of array should be predefined.

“input_static_array” transformer takes as first argument name or index of the original function argument. The argument should have “array” or “pointer” type. The second argument should be an integer value, which represents array size.


struct vector3{

    void init( int values[3] ){
        x = values[0];
        y = values[1];
        z = values[2];

    int x,y,z;

In order to expose init member function we need to create small wrapper: The following Py++ code does it for you:

from pyplusplus import module_builder
from pyplusplus import function_transformers as FT

mb = module_builder.module_builder_t( ... )
v3 = mb.class_( 'vector3' )
v3.mem_fun( 'init' ).add_transformation( FT.input_static_array( 0, 3 ) )

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

#include "__convenience.pypp.hpp" //Py++ header file, which contains few convenience function

namespace bp = boost::python;

static void init_418e52f4a347efa6b7e123b96f32a73c( ::ft::vector3 & inst, boost::python::object values ){
    int native_values[3];
    pyplus_conv::ensure_uniform_sequence< int >( values, 3 );
    pyplus_conv::copy_sequence( values, pyplus_conv::array_inserter( native_values, 3 ) );

    bp::class_< ft::vector3 >( "vector3", "documentation" )
   .def( "init"
         , &init_418e52f4a347efa6b7e123b96f32a73c
         , ( bp::arg("inst"), bp::arg("values") ) )
   .def_readwrite( "x", &ft::vector3::x )
   .def_readwrite( "y", &ft::vector3::y )
   .def_readwrite( "z", &ft::vector3::z );