C++ Standard Library including C++ 14 & C++ 17/

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Using Namespaces

Using Namespaces

Namespaces have to be written exactly as they are, however, the 'using' method allows us to make namespaces simpler.

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If you use qualified names, you have to use them exactly as defined. For each namespace you must put the scope resolution operator ::. More libraries of the C++ standard library use nested namespaces.

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#include <iostream>
#include <chrono>
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std::cout << "Hello world:" << std::endl;
auto timeNow= std::chrono::system_clock::now();

Unqualified Use of Names

You can use names in C++ with the using declaration and the using directive.

Using Declaration

A using declaration adds a name to the visibility scope, in which you applied the using ...