claw 1.9.0
 
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conditional.hpp
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1/*
2 CLAW - a C++ Library Absolutely Wonderful
3
4 CLAW is a free library without any particular aim but being useful to
5 anyone.
6
7 Copyright (C) 2005-2011 Julien Jorge
8
9 This library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
13
14 This library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public
20 License along with this library; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22
23 contact: julien.jorge@stuff-o-matic.com
24*/
30#ifndef __CLAW_CONDITIONAL_HPP__
31#define __CLAW_CONDITIONAL_HPP__
32
33namespace claw
34{
35 namespace meta
36 {
49 template <bool Cond, typename ThenPart, typename ElsePart>
51
56 template <typename ThenPart, typename ElsePart>
57 struct if_then_else<true, ThenPart, ElsePart>
58 {
61 typedef ThenPart result;
62
63 }; // struct if_then_else [true]
64
69 template <typename ThenPart, typename ElsePart>
70 struct if_then_else<false, ThenPart, ElsePart>
71 {
74 typedef ElsePart result;
75
76 }; // struct if_then_else [false]
77
78 }
79}
80
81#endif // __CLAW_CONDITIONAL_HPP__
Structures for meta-programmation.
Definition claw.hpp:76
This is the main namespace.
ElsePart result
When the condition evaluates to false, the result is the "else" part.
ThenPart result
When the condition evaluates to true, the result is the "else" part.
This structure allows to do conditional typing.