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190 lines
8.6 KiB
190 lines
8.6 KiB
// Copyright David Abrahams 2002. |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BUILTIN_CONVERTERS_DWA2002124_HPP |
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# define BUILTIN_CONVERTERS_DWA2002124_HPP |
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# include <boost/python/detail/prefix.hpp> |
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# include <boost/python/detail/none.hpp> |
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# include <boost/python/handle.hpp> |
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# include <boost/python/ssize_t.hpp> |
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# include <boost/implicit_cast.hpp> |
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# include <string> |
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# include <complex> |
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# include <boost/limits.hpp> |
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// Since all we can use to decide how to convert an object to_python |
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// is its C++ type, there can be only one such converter for each |
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// type. Therefore, for built-in conversions we can bypass registry |
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// lookups using explicit specializations of arg_to_python and |
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// result_to_python. |
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namespace boost { namespace python { |
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namespace converter |
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{ |
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template <class T> struct arg_to_python; |
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BOOST_PYTHON_DECL PyObject* do_return_to_python(char); |
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BOOST_PYTHON_DECL PyObject* do_return_to_python(char const*); |
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BOOST_PYTHON_DECL PyObject* do_return_to_python(PyObject*); |
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BOOST_PYTHON_DECL PyObject* do_arg_to_python(PyObject*); |
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} |
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// Provide specializations of to_python_value |
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template <class T> struct to_python_value; |
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namespace detail |
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{ |
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// Since there's no registry lookup, always report the existence of |
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// a converter. |
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struct builtin_to_python |
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{ |
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// This information helps make_getter() decide whether to try to |
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// return an internal reference or not. I don't like it much, |
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// but it will have to serve for now. |
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BOOST_STATIC_CONSTANT(bool, uses_registry = false); |
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}; |
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} |
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// Use expr to create the PyObject corresponding to x |
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# define BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T, expr, pytype)\ |
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template <> struct to_python_value<T&> \ |
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: detail::builtin_to_python \ |
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{ \ |
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inline PyObject* operator()(T const& x) const \ |
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{ \ |
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return (expr); \ |
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} \ |
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inline PyTypeObject const* get_pytype() const \ |
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{ \ |
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return (pytype); \ |
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} \ |
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}; \ |
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template <> struct to_python_value<T const&> \ |
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: detail::builtin_to_python \ |
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{ \ |
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inline PyObject* operator()(T const& x) const \ |
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{ \ |
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return (expr); \ |
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} \ |
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inline PyTypeObject const* get_pytype() const \ |
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{ \ |
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return (pytype); \ |
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} \ |
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}; |
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# define BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T, expr) \ |
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namespace converter \ |
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{ \ |
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template <> struct arg_to_python< T > \ |
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: handle<> \ |
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{ \ |
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arg_to_python(T const& x) \ |
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: python::handle<>(expr) {} \ |
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}; \ |
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} |
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// Specialize argument and return value converters for T using expr |
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# define BOOST_PYTHON_TO_PYTHON_BY_VALUE(T, expr, pytype) \ |
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BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(T,expr, pytype) \ |
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BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE(T,expr) |
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// Specialize converters for signed and unsigned T to Python Int |
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#if PY_VERSION_HEX >= 0x03000000 |
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# define BOOST_PYTHON_TO_INT(T) \ |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(signed T, ::PyLong_FromLong(x), &PyLong_Type) \ |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(unsigned T, ::PyLong_FromUnsignedLong(x), &PyLong_Type) |
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#else |
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# define BOOST_PYTHON_TO_INT(T) \ |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(signed T, ::PyInt_FromLong(x), &PyInt_Type) \ |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE( \ |
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unsigned T \ |
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, static_cast<unsigned long>(x) > static_cast<unsigned long>( \ |
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(std::numeric_limits<long>::max)()) \ |
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? ::PyLong_FromUnsignedLong(x) \ |
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: ::PyInt_FromLong(x), &PyInt_Type) |
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#endif |
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// Bool is not signed. |
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#if PY_VERSION_HEX >= 0x02030000 |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(bool, ::PyBool_FromLong(x), &PyBool_Type) |
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#else |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(bool, ::PyInt_FromLong(x), &PyInt_Type) |
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#endif |
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// note: handles signed char and unsigned char, but not char (see below) |
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BOOST_PYTHON_TO_INT(char) |
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BOOST_PYTHON_TO_INT(short) |
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BOOST_PYTHON_TO_INT(int) |
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BOOST_PYTHON_TO_INT(long) |
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# if defined(_MSC_VER) && defined(_WIN64) && PY_VERSION_HEX < 0x03000000 |
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/* Under 64-bit Windows std::size_t is "unsigned long long". To avoid |
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getting a Python long for each std::size_t the value is checked before |
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the conversion. A std::size_t is converted to a simple Python int |
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if possible; a Python long appears only if the value is too small or |
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too large to fit into a simple int. */ |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE( |
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signed BOOST_PYTHON_LONG_LONG, |
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( x < static_cast<signed BOOST_PYTHON_LONG_LONG>( |
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(std::numeric_limits<long>::min)()) |
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|| x > static_cast<signed BOOST_PYTHON_LONG_LONG>( |
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(std::numeric_limits<long>::max)())) |
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? ::PyLong_FromLongLong(x) |
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: ::PyInt_FromLong(static_cast<long>(x)), &PyInt_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE( |
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unsigned BOOST_PYTHON_LONG_LONG, |
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x > static_cast<unsigned BOOST_PYTHON_LONG_LONG>( |
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(std::numeric_limits<long>::max)()) |
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? ::PyLong_FromUnsignedLongLong(x) |
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: ::PyInt_FromLong(static_cast<long>(x)), &PyInt_Type) |
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// |
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# elif defined(HAVE_LONG_LONG) // using Python's macro instead of Boost's |
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// - we don't seem to get the config right |
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// all the time. |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(signed BOOST_PYTHON_LONG_LONG, ::PyLong_FromLongLong(x), &PyLong_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(unsigned BOOST_PYTHON_LONG_LONG, ::PyLong_FromUnsignedLongLong(x), &PyLong_Type) |
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# endif |
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# undef BOOST_TO_PYTHON_INT |
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#if PY_VERSION_HEX >= 0x03000000 |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(char, converter::do_return_to_python(x), &PyUnicode_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(char const*, converter::do_return_to_python(x), &PyUnicode_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::string, ::PyUnicode_FromStringAndSize(x.data(),implicit_cast<ssize_t>(x.size())), &PyUnicode_Type) |
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#else |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(char, converter::do_return_to_python(x), &PyString_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(char const*, converter::do_return_to_python(x), &PyString_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::string, ::PyString_FromStringAndSize(x.data(),implicit_cast<ssize_t>(x.size())), &PyString_Type) |
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#endif |
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#if defined(Py_USING_UNICODE) && !defined(BOOST_NO_STD_WSTRING) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::wstring, ::PyUnicode_FromWideChar(x.data(),implicit_cast<ssize_t>(x.size())), &PyUnicode_Type) |
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# endif |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(float, ::PyFloat_FromDouble(x), &PyFloat_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(double, ::PyFloat_FromDouble(x), &PyFloat_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(long double, ::PyFloat_FromDouble(x), &PyFloat_Type) |
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BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE(PyObject*, converter::do_return_to_python(x), 0) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<float>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<double>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) |
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BOOST_PYTHON_TO_PYTHON_BY_VALUE(std::complex<long double>, ::PyComplex_FromDoubles(x.real(), x.imag()), &PyComplex_Type) |
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# undef BOOST_PYTHON_RETURN_TO_PYTHON_BY_VALUE |
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# undef BOOST_PYTHON_ARG_TO_PYTHON_BY_VALUE |
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# undef BOOST_PYTHON_TO_PYTHON_BY_VALUE |
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# undef BOOST_PYTHON_TO_INT |
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namespace converter |
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{ |
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void initialize_builtin_converters(); |
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} |
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}} // namespace boost::python::converter |
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#endif // BUILTIN_CONVERTERS_DWA2002124_HPP
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