Namespace aliases - cppreference.com (original) (raw)
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.
[edit] Syntax
| | | | | ------------------------------------------------------------ | --- | | | namespace alias_name = ns_name**;** | (1) | | | | | | | namespace alias_name = ::ns_name; | (2) | | | | | | | namespace alias_name = nested_name**::ns_name;** | (3) | | | | | |
[edit] 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.
[edit] Keywords
[edit] Example
#include namespace foo { namespace bar { namespace baz { int qux = 42; } } } namespace fbz = foo::bar::baz; int main() { std::cout << fbz::qux << '\n'; }
Output: