unqualified-id: identifier operator-function-id conversion-function-id literal-operator-id ~ class-name ~ decltype-specifier template-id
An identifier is an id-expression provided it has been suitably declared (Clause [dcl.dcl]). [ Note: For operator-function-ids, see [over.oper]; for conversion-function-ids, see [class.conv.fct]; for literal-operator-ids, see [over.literal]; for template-ids, see [temp.names]. A class-name or decltype-specifier prefixed by ~ denotes a destructor; see [class.dtor]. Within the definition of a non-static member function, an identifier that names a non-static member is transformed to a class member access expression ([class.mfct.non-static]). — end note ] The type of the expression is the type of the identifier. The result is the entity denoted by the identifier. The expression is an lvalue if the entity is a function, variable, or data member and a prvalue otherwise; it is a bit-field if the identifier designates a bit-field ([dcl.decomp]).