python/include/boost/python/converter/implicit.hpp at python313 · boostorg/python · GitHub

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// Copyright David Abrahams 2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#ifndef IMPLICIT_DWA2002326_HPP

# define IMPLICIT_DWA2002326_HPP

# include <boost/python/converter/rvalue_from_python_data.hpp>

# include <boost/python/converter/registrations.hpp>

# include <boost/python/converter/registered.hpp>

# include <boost/python/extract.hpp>

namespace boost { namespace python { namespace converter {

template <class Source, class Target>

struct implicit

{

static void* convertible(PyObject* obj)

{

// Find a converter which can produce a Source instance from

// obj. The user has told us that Source can be converted to

// Target, and instantiating construct() below, ensures that

// at compile-time.

return implicit_rvalue_convertible_from_python(obj, registered<Source>::converters)

? obj : 0;

}

static void construct(PyObject* obj, rvalue_from_python_stage1_data* data)

{

void* storage = ((rvalue_from_python_storage<Target>*)data)->storage.bytes;

arg_from_python<Source> get_source(obj);

bool convertible = get_source.convertible();

BOOST_VERIFY(convertible);

new (storage) Target(get_source());

// record successful construction

data->convertible = storage;

}

};

}}} // namespace boost::python::converter

#endif // IMPLICIT_DWA2002326_HPP

python/include/boost/python/converter/implicit.hpp at python313 · boostorg/python · GitHub

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