191 lines
8.6 KiB
C++
191 lines
8.6 KiB
C++
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// 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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