C++ namespaces basic usage

Question

In the example below, is it necessary to use namespace A{} in the source file or is it redundant as it is already been done in the header file?

// header file Foo.h

namespace A
{
    class Foo
    {
        Foo();
    };
}

// source file Foo.cpp

#include "Foo.h"

namespace A
{
    Foo::Foo() {}
}

You may find that namespace A; is an easier way of doing this as it doesn't indent the entire rest of the file. — tadman
– tadman, Commented Nov 20, 2019 at 19:06
It's also much more readable as you get larger projects. Please continue this practice. — Kai
– Kai, Commented Nov 20, 2019 at 19:06
@tadman namespace A; is not proper syntax. What is it supposed to mean? — walnut
– walnut, Commented Nov 20, 2019 at 19:09
@raven Yeah using namespace A; would work as long as there are no name collisions with the global namespace. — walnut
– walnut, Commented Nov 20, 2019 at 19:17

walnut · Accepted Answer · 2019-11-20 19:15:04Z

7

It's necessary, but you can do the following instead:

// source file Foo.cpp

#include "Foo.h"

A::Foo::Foo() {}

edited Nov 20, 2019 at 19:15

walnut

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answered Nov 20, 2019 at 19:06

raven

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