conditional.hpp
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/*
CLAW - a C++ Library Absolutely Wonderful
CLAW is a free library without any particular aim but being useful to
anyone.
Copyright (C) 2005-2011 Julien Jorge
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
contact: julien.jorge@gamned.org
*/
#ifndef __CLAW_CONDITIONAL_HPP__
#define __CLAW_CONDITIONAL_HPP__
namespace claw
{
namespace meta
{
template<bool Cond, typename ThenPart, typename ElsePart>
struct if_then_else;
template<typename ThenPart, typename ElsePart>
struct if_then_else<true, ThenPart, ElsePart>
{
typedef ThenPart result;
}; // struct if_then_else [true]
template<typename ThenPart, typename ElsePart>
struct if_then_else<false, ThenPart, ElsePart>
{
typedef ElsePart result;
}; // struct if_then_else [false]
} // namespace meta
} // namespace claw
#endif // __CLAW_CONDITIONAL_HPP__
claw::meta
Structures for meta-programmation.
Definition claw.hpp:81
claw
This is the main namespace.
Definition algorithm.hpp:34
claw::meta::if_then_else< false, ThenPart, ElsePart >::result
ElsePart result
When the condition evaluates to false, the result is the "else" part.
Definition conditional.hpp:74
claw::meta::if_then_else< true, ThenPart, ElsePart >::result
ThenPart result
When the condition evaluates to true, the result is the "else" part.
Definition conditional.hpp:61
claw::meta::if_then_else
This structure allows to do conditional typing.
Definition conditional.hpp:50