DUNE
Distributed and Unified Numerics Environment
DUNE-FEM (unstable)
dune
common
concepts
hashable.hh
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// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file LICENSE.md in module root
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// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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// vi: set et ts=4 sw=2 sts=2:
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#ifndef DUNE_COMMON_CONCEPTS_HASHABLE_HH
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#define DUNE_COMMON_CONCEPTS_HASHABLE_HH
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// check whether c++20 concept can be used
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#if __has_include(<version>) && __has_include(<concepts>)
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#include <version>
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#if __cpp_concepts >= 201907L && __cpp_lib_concepts >= 202002L
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#ifndef DUNE_ENABLE_CONCEPTS
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#define DUNE_ENABLE_CONCEPTS 1
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#endif
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#endif
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#endif
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#if DUNE_ENABLE_CONCEPTS
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#include <concepts>
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#include <cstddef>
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#include <functional>
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namespace
Dune::Concept
{
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template
<
class
T>
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concept
Hashable =
requires
(T a)
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{
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{ std::hash<T>{}(a) } -> std::convertible_to<std::size_t>;
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};
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}
// end namespace Dune::Concept
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#endif
// DUNE_ENABLE_CONCEPTS
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#endif
// DUNE_COMMON_CONCEPTS_HASHABLE_HH
Dune::Concept
Namespace for concepts.
Definition:
concept.hh:34
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