2016-03-25 2:03 GMT+03:00 Klemens Morgenstern <klemens.morgenstern@gmx.net>:
I found a way to get a type_name type at compile type, i.e. a template which has a sequence of chars representing the type. This could be added to boost.type_index and would allow constexpr sorting of types by names etc. E.g. making boost::variant<int, double> and boost::variant<double, int> the same, by ordering the arguments alphabetically. Has lot of compiler overhead though.
I've tried to use __PRETTY_FUNCTION__ directly a year or two ago. Some compilers allowed that, some not. Could you try to compile that code on Clang? If that works, try to mark detail::ctti<T>::n() with constexpr and use in your code: template<std::size_t Index> constexpr static char step() { return detail::ctti<T>::n()[Index]; } If that works, then it would be a really great addition to type_index! That might also be a workaround for the REGISTER_TYPE thing in you magic
get, though I have to admit: I don't really get how this approach works, so I don't know.
That won't help. I need a way to make conversion of T type to some non-templated class and back: T -> int -> T TypeIndex allows only the first part of that: T -> type_index, but does not allow type_index -> T -- Best regards, Antony Polukhin