109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
// 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 ENUM_DWA200298_HPP
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# define ENUM_DWA200298_HPP
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# include <boost/python/detail/prefix.hpp>
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# include <boost/python/object/enum_base.hpp>
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# include <boost/python/converter/rvalue_from_python_data.hpp>
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# include <boost/python/converter/registered.hpp>
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namespace boost { namespace python {
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template <class T>
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struct enum_ : public objects::enum_base
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{
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typedef objects::enum_base base;
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// Declare a new enumeration type in the current scope()
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enum_(char const* name, char const* doc = 0);
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// Add a new enumeration value with the given name and value.
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inline enum_<T>& value(char const* name, T);
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// Add all of the defined enumeration values to the current scope with the
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// same names used here.
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inline enum_<T>& export_values();
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private:
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static PyObject* to_python(void const* x);
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static void* convertible_from_python(PyObject* obj);
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static void construct(PyObject* obj, converter::rvalue_from_python_stage1_data* data);
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};
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template <class T>
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inline enum_<T>::enum_(char const* name, char const* doc )
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: base(
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name
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, &enum_<T>::to_python
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, &enum_<T>::convertible_from_python
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, &enum_<T>::construct
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, type_id<T>()
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, doc
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)
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{
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}
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// This is the conversion function that gets registered for converting
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// these enums to Python.
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template <class T>
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PyObject* enum_<T>::to_python(void const* x)
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{
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return base::to_python(
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converter::registered<T>::converters.m_class_object
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, static_cast<long>(*(T const*)x));
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}
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//
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// The following two static functions serve as the elements of an
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// rvalue from_python converter for the enumeration type.
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//
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// This checks that a given Python object can be converted to the
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// enumeration type.
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template <class T>
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void* enum_<T>::convertible_from_python(PyObject* obj)
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{
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return PyObject_IsInstance(
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obj
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, upcast<PyObject>(
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converter::registered<T>::converters.m_class_object))
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? obj : 0;
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}
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// Constructs an instance of the enumeration type in the from_python
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// data.
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template <class T>
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void enum_<T>::construct(PyObject* obj, converter::rvalue_from_python_stage1_data* data)
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{
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#if PY_VERSION_HEX >= 0x03000000
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T x = static_cast<T>(PyLong_AS_LONG(obj));
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#else
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T x = static_cast<T>(PyInt_AS_LONG(obj));
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#endif
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void* const storage = ((converter::rvalue_from_python_storage<T>*)data)->storage.bytes;
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new (storage) T(x);
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data->convertible = storage;
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}
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template <class T>
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inline enum_<T>& enum_<T>::value(char const* name, T x)
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{
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this->add_value(name, static_cast<long>(x));
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return *this;
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}
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template <class T>
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inline enum_<T>& enum_<T>::export_values()
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{
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this->base::export_values();
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return *this;
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}
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}} // namespace boost::python
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#endif // ENUM_DWA200298_HPP
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