dune-common  2.9.0
promotiontraits.hh
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1 // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 // vi: set et ts=4 sw=2 sts=2:
3 // SPDX-FileCopyrightInfo: Copyright (C) DUNE Project contributors, see file LICENSE.md in module root
4 // SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
5 #ifndef DUNE_PROMOTIONTRAITS_HH
6 #define DUNE_PROMOTIONTRAITS_HH
7 
8 #include <utility>
9 
10 namespace Dune {
25  template <typename T1, typename T2>
27  {
28  typedef decltype(std::declval<T1>()+std::declval<T2>()) PromotedType;
29  };
30 
31  // Specialization for the case of two equal types
32  // One should think that the generic template should handle this case as well.
33  // However, the fvectortest.cc unit test fails without it if ENABLE_GMP is set.
34  template <typename T1>
35  struct PromotionTraits<T1,T1> { typedef T1 PromotedType; };
36 
38 } // end namespace
39 
40 
41 #endif // DUNE_PROMOTIONTRAITS_HH
Dune namespace.
Definition: alignedallocator.hh:13
Compute type of the result of an arithmetic operation involving two different number types.
Definition: promotiontraits.hh:27
decltype(std::declval< T1 >()+std::declval< T2 >()) typedef PromotedType
Definition: promotiontraits.hh:28
T1 PromotedType
Definition: promotiontraits.hh:35