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			* \brief GridFormat::OptionalReference
7			*/
8			#ifndef GRIDFORMAT_COMMON_OPTIONAL_REFERENCE_HPP_
9			#define GRIDFORMAT_COMMON_OPTIONAL_REFERENCE_HPP_
10
11			#include <type_traits>
12			#include <functional>
13			#include <optional>
14
15			namespace GridFormat {
16
17			/*!
18			* \ingroup Common
19			* \brief Contains an optional reference to T.
20			* Can be used e.g. in search algorithms that, if successful,
21			* return a reference to T and none if the search failed.
22			*/
23			template<typename T>
24			class OptionalReference {
25			public:
26		73738	OptionalReference() = default;
27		200086	OptionalReference(T& ref) : _ref{ref} {}
28
29		1	void release() { _ref.reset(); }
30
31		75812	T& unwrap() requires(!std::is_const_v<T>) { return _ref.value(); }
32		63173	const T& unwrap() const { return _ref.value(); }
33
34		4	bool has_value() const { return _ref.has_value(); }
35		273819	operator bool() const { return _ref.has_value(); }
36
37			private:
38			std::optional<std::reference_wrapper<T>> _ref;
39			};
40
41			template<typename T>
42			OptionalReference(T&) -> OptionalReference<T>;
43
44			} // namespace GridFormat
45
46			#endif // GRIDFORMAT_COMMON_OPTIONAL_REFERENCE_HPP_
47