DUNE
Distributed and Unified Numerics Environment
DUNE-FEM (unstable)
dune
common
concepts
hashable.hh
1
// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file LICENSE.md in module root
2
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
3
// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
4
// vi: set et ts=4 sw=2 sts=2:
5
#ifndef DUNE_COMMON_CONCEPTS_HASHABLE_HH
6
#define DUNE_COMMON_CONCEPTS_HASHABLE_HH
7
8
// check whether c++20 concept can be used
9
#if __has_include(<version>) && __has_include(<concepts>)
10
#include <version>
11
#if __cpp_concepts >= 201907L && __cpp_lib_concepts >= 202002L
12
#ifndef DUNE_ENABLE_CONCEPTS
13
#define DUNE_ENABLE_CONCEPTS 1
14
#endif
15
#endif
16
#endif
17
18
#if DUNE_ENABLE_CONCEPTS
19
20
#include <concepts>
21
#include <cstddef>
22
#include <functional>
23
24
namespace
Dune::Concept
{
25
47
template
<
class
T>
48
concept
Hashable =
requires
(T a)
49
{
50
{ std::hash<T>{}(a) } -> std::convertible_to<std::size_t>;
51
};
52
53
}
// end namespace Dune::Concept
54
55
#endif
// DUNE_ENABLE_CONCEPTS
56
57
#endif
// DUNE_COMMON_CONCEPTS_HASHABLE_HH
Dune::Concept
Namespace for concepts.
Definition:
concept.hh:34
|
Legal Statements / Impressum
| Hosted by
TU Dresden
| generated with Hugo v0.111.3 (Nov 12, 23:30, 2024)