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[SVN r8992]
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Dave Abrahams
2001-02-07 04:51:12 +00:00
parent 8b60ca8d0a
commit 8ffb174556
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include/boost/detail/select_type.hpp Normal file
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// (C) Copyright David Abrahams 2001. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
//
// See http://www.boost.org for most recent version including documentation.
// Revision History
// 06 Feb 2001 - Created (David Abrahams)
#ifndef SELECT_TYPE_DWA20010206_HPP
# define SELECT_TYPE_DWA20010206_HPP
namespace boost { namespace detail {
// Template class if_true -- select among 2 types based on a bool constant expression
// Usage:
// typename if_true<(bool_const_expression)>::template then<true_type, false_type>::type
template <bool> struct if_true;
template <>
struct if_true<true>
{
template <class T, class F>
struct then { typedef T type; };
};
template <>
struct if_true<false>
{
template <class T, class F>
struct then { typedef F type; };
};
}}
#endif // SELECT_TYPE_DWA20010206_HPP