感觉有时候msdn上解释挺清楚的

Trivial, standard-layout, POD, and literal types
https://learn.microsoft.com/en-us/cpp/cpp/trivial-standard-layout-and-pod-types?view=msvc-170

不过这几个东西即使看明白了，过一阵可能也忘了，条款太多了，给人的心智负担太重
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