Re: namespace local/private variable and functions

Victor Bazarov <>
Tue, 06 Oct 2009 10:21:52 -0400
Simon wrote:


consider the following

// header.h
namespace mynamespace{
  void someFunction( ... );

// header.cpp
#include "someclass.h"

namespace mynamespace{
  static someclass mSomePrivateClass;

  void somePrivateFunction( ... )
    // use mSomePrivateClass to do some more work

  void someFunction( ... )
    somePrivateFunction( ... )

The above code is legal, (as far as I can tell), but it does not look
very 'clean' to me.

Is it bad practice to have a function in the namespace that is not
accessible to the rest of the code?

By no means. You make available whatever you deem as such. Namespace
or not, some functions and objects are going to be "private".

And is there a better solution than using a static variable, the problem
in my case is that the class constructor is not really slow and, as the
data never changes, it would be foolish to call it over and over simply
to be cosmetically correct.

You use what you have to.

So, can a namespace have a locally/(private?) declared function?
Is the use of a static variable advisable?

It's either a static (having internal linkage) or a class static or a
member of unnamed namespace... It doesn't really matter. There are
different ways to implement singletons (whether they are const or not)
and you just pick the one that's easy for you to maintain.

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