[Solved] c++ using stl vector [closed]

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Every #include directive including something from the C++ standard library “loads” the entities into the std namespace (or some other namespace like this).

The namespace helps preventing global namespace pollution – by keeping everything in a seperate namespace, identifier collisions are rendered impossible.

In the <vector> file, then there is something like

namespace std {
    template<typename T> class vector {
        ...
    };
}

As you see, the vector template is still in the std namespace.

In summary, you use an #include preprocessor directive to use some facility provided in a header file. The file’s contents textually replace the #include directive.
Still, these facilities are in a different namespace to prevent name clashing.

solved c++ using stl vector [closed]