inout_static_array
transformer¶
Definition¶
inout_static_array
transformer is a combination of input
and output transformers.
It allows one to call a C++ function, which takes an array using Python list
class
“inout_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 specifies the array size.
Example¶
int sum_and_fill( int v[3], int value ){
int result = v[0] + v[1] + v[2];
v[0] = value;
v[1] = value;
v[2] = value;
return result;
}
In order to expose sum_and_fill
function we need to create a 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( ... ) sum_and_fill = mb.free_fun( 'sum_and_fill' ) sum_and_fill.add_transformation( ft.inout_static_array('v', 3) )
What you see below is the relevant pieces of generated code:
static boost::python::tuple sum_and_fill_2dd285a3344dbf7d71ffb7c78dd614c5( boost::python::object v, int value ){ int native_v[3]; boost::python::list py_v; pyplus_conv::ensure_uniform_sequence< int >( v, 3 ); pyplus_conv::copy_sequence( v, pyplus_conv::array_inserter( native_v, 3 ) ); int result = ::sum_and_fill(native_v, value); pyplus_conv::copy_container( native_v, native_v + 3, pyplus_conv::list_inserter( py_v ) ); return bp::make_tuple( result, py_v ); } BOOST_PYTHON_MODULE(ft_inout_static_array){ { //::ft::sum_and_fill typedef boost::python::tuple ( *sum_and_fill_function_type )( boost::python::object,int ); bp::def( "sum_and_fill" , sum_and_fill_function_type( &sum_and_fill_2dd285a3344dbf7d71ffb7c78dd614c5 ) , ( bp::arg("v"), bp::arg("value") ) ); } }