Atomics

In addition to booleans, there are atomics for pointers, integrals and user defined types. The rules for user-defined types are special.

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The Atomic Boolean

The remaining atomics - in contrast to std::atomic_flag - are partial or full specialisations of the class template std::atomic. Let's start with std::atomic<bool>.

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The Atomic Flag

Atomics guarantee two characteristics. At one hand, they are atomic, at the other hand, they provide synchronisation and order constraints on the program execution.

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Sequential Consistency

The atomics are the base of the C++ memory model. Per default, sequential consistency is applied.

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C++ Memory Model

Since C++11, C++ has a memory model. It is the foundation for multithreading. Without it, multithreading is not well defined. 

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