Namespace alias

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A namespace can be given an alias (i.e., another name for the same namespace) using the namespace identifier = syntax. Members of the aliased namespace can be accessed by qualifying them with the name of the alias. In the following example, the nested namespace AReallyLongName::AnotherReallyLongName is inconvenient to type, so the function qux locally declares an alias N. Members of that namespace can then be accessed simply using N::.

namespace AReallyLongName {
    namespace AnotherReallyLongName {
        int foo();
        int bar();
        void baz(int x, int y);
void qux() {
    namespace N = AReallyLongName::AnotherReallyLongName;
    N::baz(N::foo(), N::bar());

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