c++ - 为什么在 C++20 中不推荐使用 std::is_pod？

Question

std::is_pod 在 C++20 中可能会被弃用。
这个选择的原因是什么？我应该用什么来代替 std::is_pod 来知道一个类型是否真的是一个 POD？

Answer 1

POD 正在被两个类别所取代，这些类别提供更多细微差别。 c++ standard meeting in november 2017不得不说:

Deprecating the notion of “plain old data” (POD). It has been replaced with two more nuanced categories of types, “trivial” and “standard-layout”. “POD” is equivalent to “trivial and standard layout”, but for many code patterns, a narrower restriction to just “trivial” or just “standard layout” is appropriate; to encourage such precision, the notion of “POD” was therefore deprecated. The library trait is_pod has also been deprecated correspondingly.

对于简单的数据类型，使用 is_standard_layout函数，对于琐碎的数据类型(例如简单结构)，使用 is_trivial功能。