How to distinguish between "using declaration" and "using directive" in C++?

Question

How can I distinguish between "using-declaration" and "using directive" in C++? What are the main differences between "using-declaration" and "using directive"? Could somebody make it clear by giving some simple examples? I would be grateful to have some help with this question.

https://en.cppreference.com/w/cpp/keyword/using – Jesper Juhl Jun 03 '20 at 05:20 — Jesper Juhl, Jun 03 '20 at 05:20

score 2 · Accepted Answer · answered Jun 03 '20 at 06:43

2

As description in https://en.cppreference.com/w/cpp/keyword/using

using-directives for namespaces and using-declarations for namespace members

using namespace std; // using-directive   
using std::string;   // using-declaration

answered Jun 03 '20 at 06:43

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How to distinguish between "using declaration" and "using directive" in C++?

1 Answers1