43 lines
1.0 KiB
C++
43 lines
1.0 KiB
C++
/* -*- C++ -*- ------------------------------------------------------------
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Copyright (c) 2007 Jesse Anders and Demian Nave http://cmldev.net/
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The Configurable Math Library (CML) is distributed under the terms of the
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Boost Software License, v1.0 (see cml/LICENSE for details).
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*-----------------------------------------------------------------------*/
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/** @file
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* @brief
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*/
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#ifndef meta_if_h
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#define meta_if_h
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#include <cml/core/meta/common.h>
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namespace cml {
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/** Select argument type based upon truth value. */
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template<bool yn, typename TrueT, typename FalseT> struct select_if;
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/** Result is TrueT if true. */
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template<typename TrueT, typename FalseT>
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struct select_if<true,TrueT,FalseT> {
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typedef TrueT result;
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enum { is_true = true };
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};
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/** Result is FalseT if false. */
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template<typename TrueT, typename FalseT>
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struct select_if<false,TrueT,FalseT> {
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typedef FalseT result;
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enum { is_true = false };
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};
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} // namespace cml
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#endif
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// -------------------------------------------------------------------------
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// vim:ft=cpp
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