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if_else.hpp
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81 lines (69 loc) · 1.36 KB
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// 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 IF_ELSE_DWA2002322_HPP
# define IF_ELSE_DWA2002322_HPP
# include <boost/config.hpp>
namespace boost { namespace python { namespace detail {
template <class T> struct elif_selected;
template <class T>
struct if_selected
{
template <bool b>
struct elif : elif_selected<T>
{
};
template <class U>
struct else_
{
typedef T type;
};
};
template <class T>
struct elif_selected
{
# if !(defined(__MWERKS__) && __MWERKS__ <= 0x2407)
template <class U> class then;
# else
template <class U>
struct then : if_selected<T>
{
};
# endif
};
# if !(defined(__MWERKS__) && __MWERKS__ <= 0x2407)
template <class T>
template <class U>
class elif_selected<T>::then : public if_selected<T>
{
};
# endif
template <bool b> struct if_
{
template <class T>
struct then : if_selected<T>
{
};
};
struct if_unselected
{
template <bool b> struct elif : if_<b>
{
};
template <class U>
struct else_
{
typedef U type;
};
};
template <>
struct if_<false>
{
template <class T>
struct then : if_unselected
{
};
};
}}} // namespace boost::python::detail
#endif // IF_ELSE_DWA2002322_HPP