例外 noexcept规格: noexcept 例 二次 #include<iostream>#include<thread>intmain(){unsignedintn=std::thread::hardware_concurrency
保证至少alignof(std::max_align_t) 二次 structkeep_apart{alignas(std::hardware_destructive_interference_size
YCFsG6elYca568hBi2pZ0.3LDL5wjgxct1N8w/oLR/jfHsiQwCqTS';// The cost parameter can change over time as hardware
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