问题
I know the answer could be that they did not prioritize it, but it really feels like intentional omission, they already have plenty of C++20 core language/library features and this C++17 feature is still not implemented.
In fact according to this table it is the only C++17 library feature that both clang and gcc did not implement.
来源：https://stackoverflow.com/questions/62025586/what-is-the-reason-why-clang-and-gcc-do-not-implement-stdhardware-constructiv