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std::barrier<CompletionFunction>:: barrier

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std::barrier
constexpr explicit barrier ( std:: ptrdiff_t expected,
CompletionFunction f = CompletionFunction ( ) ) ;
(1) (C++20 起)
barrier ( const barrier & ) = delete ;
(2) (C++20 起)
1) 将每个阶段的初始期望计数和第一阶段的当前期望计数均设置为 expected ，使用 std :: move ( f ) 初始化完成函数对象，随后启动第一阶段。若 expected 为负值或大于 max() ，则行为未定义。
2) 复制构造函数被删除。 barrier 既不可复制也不可移动。

参数

expected - 期望计数的初始值
f - 在阶段完成步骤中调用的完成函数对象

异常

1) 由 CompletionFunction 的移动构造函数抛出的任何异常。

注释

expected 允许为零。然而，对此类 barrier 调用析构函数以外的任何非静态成员函数将导致未定义行为。换言之，此类 barrier 仅可被销毁。