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include/boost/detail/select_type.hpp
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include/boost/detail/select_type.hpp
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// (C) Copyright David Abrahams 2001. Permission to copy, use, modify,
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// sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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//
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// See http://www.boost.org for most recent version including documentation.
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// Revision History
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// 09 Feb 01 Applied John Maddock's Borland patch Moving <true>
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// specialization to unspecialized template (David Abrahams)
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// 06 Feb 01 Created (David Abrahams)
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#ifndef SELECT_TYPE_DWA20010206_HPP
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# define SELECT_TYPE_DWA20010206_HPP
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namespace boost { namespace detail {
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// Template class if_true -- select among 2 types based on a bool constant expression
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// Usage:
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// typename if_true<(bool_const_expression)>::template then<true_type, false_type>::type
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template <bool> struct if_true
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{
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template <class T, class F>
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struct then { typedef T type; };
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};
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template <>
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struct if_true<false>
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{
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template <class T, class F>
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struct then { typedef F type; };
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};
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}}
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#endif // SELECT_TYPE_DWA20010206_HPP
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