已析构\n"; } }; int main() { alignas(Tracer) unsigned char buffer[sizeof(Tracer) * 8]; for (int i = 0; i < 8; ++i) new(buffer + sizeof(Tracer) * i) Tracer{i}; // 手工构造对象 auto ptr = std::launder(reinterpret_cast<Tracer*>(buffer)); std::destroy_n(ptr, 8); ...
destructed\n"; } }; int main() { alignas(Tracer) unsigned char buffer[sizeof(Tracer) * 8]; for (int i = 0; i < 8; ++i) new(buffer + sizeof(Tracer) * i) Tracer{i}; // 手工构造对象 auto ptr = std::launder(reinterpret_cast<Tracer*>(buffer)); std::destroy_n(ptr, 8);...
template<class ForwardIt, class Size> constexpr // C++20 起 ForwardIt destroy_n( ForwardIt first, Size n ) { for (; n > 0; (void) ++first, --n) std::destroy_at(std::addressof(*first)); return first; } 示例 下列示例演示如何用 destroy_n 销毁元素的相接序列。运行...
std::destroy_n定义于头文件 <memory> (1) template< class ForwardIt, class Size > ForwardIt destroy_n( ForwardIt first, Size n ); (C++17 起) (C++20 前) template< class ForwardIt, class Size > constexpr ForwardIt destroy_n( ForwardIt first, Size n ); (C++20 起) template< ...