/usr/include/dune/common/promotiontraits.hh is in libdune-common-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_PROMOTIONTRAITS_HH
#define DUNE_PROMOTIONTRAITS_HH
#include <utility>
namespace Dune {
/**
* @file
* @brief Compute type of the result of an arithmetic operation involving two different number types.
*
* @author Matthias Wohlmuth
*/
/** @addtogroup Common
*
* @{
*/
/** \brief Compute type of the result of an arithmetic operation involving two different number types.
*/
template <typename T1, typename T2>
struct PromotionTraits
{
typedef decltype(std::declval<T1>()+std::declval<T2>()) PromotedType;
};
// Specialization for the case of two equal types
// One should think that the generic template should handle this case as well.
// However, the fvectortest.cc unit test fails without it if ENABLE_GMP is set.
template <typename T1>
struct PromotionTraits<T1,T1> { typedef T1 PromotedType; };
/** @} */
} // end namespace
#endif // DUNE_PROMOTIONTRAITS_HH
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