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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../header/latch.html below:

Standard library header <latch>Â (C++20)

This header is part of the thread support library.

namespace std {
  class latch;
}

namespace std {
  class latch {
  public:
    static constexpr ptrdiff_t max() noexcept;
 
    constexpr explicit latch(ptrdiff_t expected);
    ~latch();
 
    latch(const latch&) = delete;
    latch& operator=(const latch&) = delete;
 
    void count_down(ptrdiff_t update = 1);
    bool try_wait() const noexcept;
    void wait() const;
    void arrive_and_wait(ptrdiff_t update = 1);
 
  private:
    ptrdiff_t counter;  // exposition only
  };
}

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