constexpr explicit barrier( std::ptrdiff_t expected, CompletionFunction f = CompletionFunction()); | (1) | (since C++20) |
barrier( const barrier & ) = delete; | (2) | (since C++20) |
expected
, initializes the completion function object with std::move(f)
, and then starts the first phase. The behavior is undefined if expected
is negative or greater than max()
.barrier
is neither copyable nor movable.expected | - | initial value of the expected count |
f | - | completion function object to be called on phase completion step |
CompletionFunction
's move constructor.expected
is permitted to be zero. However, calling any non-static member function other than the destructor on such barrier
results in undefined behavior. In other words, such barrier
can only be destroyed.
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