| // 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 BUILTIN_CONVERTERS_DWA2002124_HPP |
| # define BUILTIN_CONVERTERS_DWA2002124_HPP |
| # include <boost/python/detail/prefix.hpp> |
| # include <boost/python/detail/none.hpp> |
| # include <boost/python/handle.hpp> |
| # include <boost/python/ssize_t.hpp> |
| # include <boost/implicit_cast.hpp> |
| # include <string> |
| # include <complex> |
| # include <boost/limits.hpp> |
| |
| // Since all we can use to decide how to convert an object to_python |
| // is its C++ type, there can be only one such converter for each |
| // type. Therefore, for built-in conversions we can bypass registry |
| // lookups using explicit specializations of arg_to_python and |
| // result_to_python. |
| |
| namespace boost { namespace python { |
| |
| namespace converter |
| { |
| template <class T> struct arg_to_python; |
| BOOST_PYTHON_DECL PyObject* do_return_to_python(char); |
| BOOST_PYTHON_DECL PyObject* do_return_to_python(char const*); |
| BOOST_PYTHON_DECL PyObject* do_return_to_python(PyObject*); |
| BOOST_PYTHON_DECL PyObject* do_arg_to_python(PyObject*); |
| } |
| |
| // Provide specializations of to_python_value |
| template <class T> struct to_python_value; |
| |
| namespace detail |
| { |
| // Since there's no registry lookup, always report the existence of |
| // a converter. |
| struct builtin_to_python |
| { |
| // This information helps make_getter() decide whether to try to |
| // return an internal reference or not. I don't like it much, |
| // but it will have to serve for now. |
| BOOST_STATIC_CONSTANT(bool, uses_registry = false); |
| }; |
| } |
| |
| // Use expr to create the PyObject corresponding to x |
| # define BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T, expr, pytype)\ |
| template <> struct to_python_value<T&> \ |
| : detail::builtin_to_python \ |
| { \ |
| inline PyObject* operator()(T const& x) const \ |
| { \ |
| return (expr); \ |
| } \ |
| inline PyTypeObject const* get_pytype() const \ |
| { \ |
| return (pytype); \ |
| } \ |
| }; \ |
| template <> struct to_python_value<T const&> \ |
| : detail::builtin_to_python \ |
| { \ |
| inline PyObject* operator()(T const& x) const \ |
| { \ |
| return (expr); \ |
| } \ |
| inline PyTypeObject const* get_pytype() const \ |
| { \ |
| return (pytype); \ |
| } \ |
| }; |
| |
| # define BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T, expr) \ |
| namespace converter \ |
| { \ |
| template <> struct arg_to_python< T > \ |
| : handle<> \ |
| { \ |
| arg_to_python(T const& x) \ |
| : python::handle<>(expr) {} \ |
| }; \ |
| } |
| |
| // Specialize argument and return value converters for T using expr |
| # define BOOST_PYTHON_TO_PYTHON_BY_VALUE(T, expr, pytype) \ |
| BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T,expr, pytype) \ |
| BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T,expr) |
| |
| // Specialize converters for signed and unsigned T to Python Int |
| # define BOOST_PYTHON_TO_INT(T) \ |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(signed T, ::PyInt_FromLong(x), &PyInt_Type) \ |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE( \ |
| unsigned T \ |
| , static_cast<unsigned long>(x) > static_cast<unsigned long>( \ |
| (std::numeric_limits<long>::max)()) \ |
| ? ::PyLong_FromUnsignedLong(x) \ |
| : ::PyInt_FromLong(x), &PyInt_Type) |
| |
| // Bool is not signed. |
| #if PY_VERSION_HEX >= 0x02030000 |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(bool, ::PyBool_FromLong(x), &PyBool_Type) |
| #else |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(bool, ::PyInt_FromLong(x), &PyInt_Type) |
| #endif |
| |
| // note: handles signed char and unsigned char, but not char (see below) |
| BOOST_PYTHON_TO_INT(char) |
| |
| BOOST_PYTHON_TO_INT(short) |
| BOOST_PYTHON_TO_INT(int) |
| BOOST_PYTHON_TO_INT(long) |
| |
| // using Python's macro instead of Boost's - we don't seem to get the |
| // config right all the time. |
| # ifdef HAVE_LONG_LONG |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(signed BOOST_PYTHON_LONG_LONG, ::PyLong_FromLongLong(x), &PyInt_Type) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(unsigned BOOST_PYTHON_LONG_LONG, ::PyLong_FromUnsignedLongLong(x), &PyInt_Type) |
| # endif |
| |
| # undef BOOST_TO_PYTHON_INT |
| |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(char, converter::do_return_to_python(x), &PyString_Type) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(char const*, converter::do_return_to_python(x), &PyString_Type) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::string, ::PyString_FromStringAndSize(x.data(),implicit_cast<ssize_t>(x.size())), &PyString_Type) |
| #if defined(Py_USING_UNICODE) && !defined(BOOST_NO_STD_WSTRING) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::wstring, ::PyUnicode_FromWideChar(x.data(),implicit_cast<ssize_t>(x.size())), &PyString_Type) |
| # endif |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(float, ::PyFloat_FromDouble(x), &PyFloat_Type) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(double, ::PyFloat_FromDouble(x), &PyFloat_Type) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(long double, ::PyFloat_FromDouble(x), &PyFloat_Type) |
| BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(PyObject*, converter::do_return_to_python(x), 0) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<float>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<double>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) |
| BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<long double>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) |
| |
| # undef BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE |
| # undef BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE |
| # undef BOOST_PYTHON_TO_PYTHON_BY_VALUE |
| # undef BOOST_PYTHON_TO_INT |
| |
| namespace converter |
| { |
| |
| void initialize_builtin_converters(); |
| |
| } |
| |
| }} // namespace boost::python::converter |
| |
| #endif // BUILTIN_CONVERTERS_DWA2002124_HPP |