FlagGuard.hpp
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1 /*
2  * Copyright (c) 2017 Louis Langholtz https://github.com/louis-langholtz/PlayRho
3  *
4  * This software is provided 'as-is', without any express or implied
5  * warranty. In no event will the authors be held liable for any damages
6  * arising from the use of this software.
7  *
8  * Permission is granted to anyone to use this software for any purpose,
9  * including commercial applications, and to alter it and redistribute it
10  * freely, subject to the following restrictions:
11  *
12  * 1. The origin of this software must not be misrepresented; you must not
13  * claim that you wrote the original software. If you use this software
14  * in a product, an acknowledgment in the product documentation would be
15  * appreciated but is not required.
16  * 2. Altered source versions must be plainly marked as such, and must not be
17  * misrepresented as being the original software.
18  * 3. This notice may not be removed or altered from any source distribution.
19  */
20 
21 #ifndef PLAYRHO_COMMON_FLAGGUARD_HPP
22 #define PLAYRHO_COMMON_FLAGGUARD_HPP
23 
24 #include <type_traits>
25 
26 namespace playrho {
27 
29  template <typename T>
30  class FlagGuard
31  {
32  public:
38  FlagGuard(T& flag, T value) : m_flag(flag), m_value(value)
39  {
40  static_assert(std::is_unsigned<T>::value, "Unsigned type required");
41  m_flag |= m_value;
42  }
43 
45  FlagGuard(const FlagGuard<T>& value) = default;
46 
48  FlagGuard(FlagGuard<T>&& value) noexcept = default;
49 
51  FlagGuard<T>& operator= (const FlagGuard<T>& value) = default;
52 
54  FlagGuard<T>& operator= (FlagGuard<T>&& value) noexcept = default;
55 
58  ~FlagGuard() noexcept
59  {
60  m_flag &= ~m_value;
61  }
62 
63  FlagGuard() = delete;
64 
65  private:
66  T& m_flag;
67  T m_value;
68  };
69 
70 } // namespace playrho
71 
72 #endif // PLAYRHO_COMMON_FLAGGUARD_HPP