Ptt 大爆卦 | Using namespace std - 前往 https://quuxplusone.github.io/blog/2020/12/21/using-directive/

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並前往https://quuxplusone.github.io/blog/2020/12/21/using-directive/

How do C++ using-directives work? – Arthur O'Dwyer

Recall that in C++ there's a difference between a ... using std::string; // using-declaration using namespace std; // using-directive ...

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