Imported existing code

libraries/include/boost/python/converter/builtin_converters.hpp

@@ -0,0 +1,153 @@
+// 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