ns int int ns::operator""_op (unsigned long long) operator""_op unsigned long long An operator. int int ns::operator""_oq (unsigned long long) operator""_oq unsigned long long Another operator. void void ns::foo (std::initializer_list< int * >) foo std::initializer_list< int * > Function. A namespace. Link to an UDL w/o spaces: operator""_op Link to an UDL with spaces: operator""_oq Link to a function with spaces: foo(std::initializer_list< int* >) Link to a function w/o spaces: foo(std::initializer_list<int*>)