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std::latch:: latch

From cppreference.net
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std::latch
constexpr explicit latch ( std:: ptrdiff_t expected ) ;
(1) (C++20 起)
latch ( const latch & ) = delete ;
(2) (C++20 起)
1) 构造一个 latch 并初始化其内部计数器。若 expected 为负数或大于 max() ，则行为未定义。
2) 复制构造函数被删除。 latch 既不可复制也不可移动。

参数

expected - 内部计数器的初始值

异常

不抛出任何异常。