Namespace aliases

Namespace aliases allow the programmer to define an alternate name for a namespace.

They are commonly used as a convenient shortcut for long or deeply-nested namespaces.

Syntax

`namespace` alias_name = ns_name`;`	(1)
`namespace` alias_name = `::`ns_name`;`	(2)
`namespace` alias_name = nested_name`::`ns_name`;`	(3)

Explanation

The new alias alias_name provides an alternate method of accessing ns_name.

alias_name must be a name not previously used. alias_name is valid for the duration of the scope in which it is introduced.

Example

#include <iostream>
  
namespace foo {
    namespace bar {
         namespace baz {
             int qux = 42;
         }
    }
}
  
namespace fbz = foo::bar::baz;
  
int main()
{
    std::cout << fbz::qux << '\n';
}

Output:

Namespace aliases

Syntax

Explanation

Example

See also