Jonathan Wakely
8be17e2ac7
For any typedef-name or template parameter, T, add_const_t<T> is equivalent to T const, so we can avoid instantiating the std::add_const class template and just say T const (or const T). This isn't true for a non-typedef like int&, where int& const would be ill-formed, but we shouldn't be using add_const_t<int&> anyway, because we know what that type is. The only place we need to continue using std::add_const is in the std::bind implementation where it's used as a template template parameter to be applied as a metafunction elsewhere. libstdc++-v3/ChangeLog: * include/bits/stl_iterator.h (__iter_to_alloc_t): Replace add_const_t with const-qualifier. * include/bits/utility.h (tuple_element<N, cv T>): Likewise for all cv-qualifiers. * include/std/type_traits (add_const, add_volatile): Replace typedef-declaration with using-declaration. (add_cv): Replace add_const and add_volatile with cv-qualifiers. * include/std/variant (variant_alternative<N, cv T>): Replace add_const_t, add_volatile_t and add_cv_t etc. with cv-qualifiers.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.