[namespace.unnamed] (original) (raw)

9 Declarations [dcl]

9.9 Namespaces [basic.namespace]

9.9.2 Namespace definition [namespace.def]

9.9.2.2 Unnamed namespaces [namespace.unnamed]

An unnamed-namespace-definition behaves as if it were replaced by

inline namespace unique { /* empty body */ }
using namespace unique ;
namespace unique { namespace-body }

whereinline appears if and only if it appears in theunnamed-namespace-definitionand all occurrences of unique in a translation unit are replaced by the same identifier, and this identifier differs from all other identifiers in the program.

[Example 1: namespace { int i; } // _unique_​::​i void f() { i++; } // _unique_​::​i++ namespace A { namespace { int i; // A​::​_unique_​::​i int j; // A​::​_unique_​::​j } void g() { i++; } // A​::​_unique_​::​i++ } using namespace A;void h() { i++; // error: _unique_​::​i or A​::​_unique_​::​i A::i++; // A​::​_unique_​::​i j++; // A​::​_unique_​::​j } — _end example_]