select_type.hpp
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00001 // (C) Copyright David Abrahams 2001.
00002 // Distributed under the Boost Software License, Version 1.0. (See
00003 // accompanying file LICENSE_1_0.txt or copy at
00004 // http://www.boost.org/LICENSE_1_0.txt)
00005 //
00006 // See http://www.boost.org for most recent version including documentation.
00007 
00008 // Revision History
00009 // 09 Feb 01  Applied John Maddock's Borland patch Moving <true>
00010 //            specialization to unspecialized template (David Abrahams)
00011 // 06 Feb 01  Created (David Abrahams)
00012 
00013 #ifndef SELECT_TYPE_DWA20010206_HPP
00014 # define SELECT_TYPE_DWA20010206_HPP
00015 
00016 namespace boost { namespace detail {
00017 
00018   // Template class if_true -- select among 2 types based on a bool constant expression
00019   // Usage:
00020   //   typename if_true<(bool_const_expression)>::template then<true_type, false_type>::type
00021 
00022   // HP aCC cannot deal with missing names for template value parameters
00023   template <bool b> struct if_true
00024   {
00025       template <class T, class F>
00026       struct then { typedef T type; };
00027   };
00028 
00029   template <>
00030   struct if_true<false>
00031   {
00032       template <class T, class F>
00033       struct then { typedef F type; };
00034   };
00035 }}
00036 #endif // SELECT_TYPE_DWA20010206_HPP


appl
Author(s): petercai
autogenerated on Tue Jan 7 2014 11:02:29