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std::latch::latch

constexpr explicit latch( std::ptrdiff_t expected );
 (1) (since C++20) 
latch( const latch & ) = delete;
 (2) (since C++20)
1) Constructs a latch and initializes its internal counter. The behavior is undefined if expected is negative or greater than max().
2) Copy constructor is deleted. latch is neither copyable nor movable.

Parameters

expected - the initial value of the internal counter

Exceptions

Throws nothing.

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