GCC Code Coverage Report

Line	Branch	Exec	Source
1			// SPDX-FileCopyrightText: 2022-2023 Dennis Gläser <dennis.glaeser@iws.uni-stuttgart.de>
2			// SPDX-License-Identifier: MIT
3			/*!
4			* \file
5			* \ingroup Common
6			* \copydoc GridFormat::LValueReferenceOf
7			*/
8			#ifndef GRIDFORMAT_COMMON_LVALUE_REFERENCE_HPP_
9			#define GRIDFORMAT_COMMON_LVALUE_REFERENCE_HPP_
10
11			#include <type_traits>
12			#include <concepts>
13
14			namespace GridFormat {
15
16			/*!
17			* \ingroup Common
18			* \brief Helper class that can be used in interfaces that require lvalue references.
19			* \details Since temporaries of T also bind to const T&, interfaces (e.g. constructors)
20			* that take a reference and store it can lead to dangling references when called
21			* with temporaries. In those places, using this helper type yields compile-time
22			* errors in such cases.
23			*/
24			template<typename T>
25			class LValueReferenceOf {
26			public:
27			template<typename _T>
28			requires(std::same_as<std::remove_const_t<T>, std::remove_cvref_t<_T>>)
29		83320	LValueReferenceOf(_T&& ref) : _ref{ref} {
30			static_assert(
31			std::is_lvalue_reference_v<_T>,
32			"Cannot bind a temporary to an lvalue reference."
33			);
34		83320	}
35
36		83312	T& get() { return _ref; }
37			std::add_const_t<T>& get() const { return _ref; }
38
39			private:
40			T& _ref;
41			};
42
43			template<typename T>
44			LValueReferenceOf(T&&) -> LValueReferenceOf<std::remove_reference_t<T>>;
45
46			} // namespace GridFormat
47
48			#endif // GRIDFORMAT_COMMON_LVALUE_REFERENCE_HPP_
49