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/*
* Copyright (c) 2010, Michael Lehn * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1) Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2) Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3) Neither the name of the FLENS development group nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef FLENS_AUXILIARY_PROMOTION_H #define FLENS_AUXILIARY_PROMOTION_H 1 #include <flens/auxiliary/ifelseif.h> #include <flens/auxiliary/isconvertible.h> namespace flens { template <typename... Args> struct Promotion { }; template <typename T> struct Promotion<T> { typedef T Type; }; template <typename T> struct Promotion<T, T> { typedef T Type; }; template <typename T, typename... Args> struct Promotion<T, Args...> { typedef typename Promotion<Args... >::Type ArgsT; typedef typename Promotion<T, ArgsT>::Type Type; }; template <typename T1, typename T2> struct Promotion<T1, T2> { typedef typename IfElseIf<sizeof(T2)<=sizeof(T1), T1, sizeof(T1)<=sizeof(T2), T2>::Type Type; }; //-- int, float ---------------------------------------------------------------- template <> struct Promotion<int, float> { typedef float Type; }; template <> struct Promotion<float, int> { typedef float Type; }; //-- long, float --------------------------------------------------------------- template <> struct Promotion<long, float> { typedef float Type; }; template <> struct Promotion<float, long> { typedef float Type; }; //-- int, double --------------------------------------------------------------- template <> struct Promotion<int, double> { typedef double Type; }; template <> struct Promotion<double, int> { typedef double Type; }; //-- long, double -------------------------------------------------------------- template <> struct Promotion<long, double> { typedef double Type; }; template <> struct Promotion<double, long> { typedef double Type; }; } // namespace flens #endif // FLENS_AUXILIARY_PROMOTION_H |