Implement c++ function inside or outside of namespace? [closed]

Question

I am new to C++ and I want to know what is better/cleaner?

1. Implementing a function in a namespace
2. Use the fully qualified name to implement it

e.g:

//foo.h
namespace foo
{
    void bar();
}

1.)

//foo.cpp
namespace foo
{
    void bar()
    {
        //do something
    }
}

or 2.)

//foo.cpp
void foo::bar()
{
    //do something
}

Answer 1

There is no difference what-so-ever to the resulting compiled code. It is purely a matter of style.

Use what you like the most (or what is currently the style-in-use of the code base you are working on).