Hi Peter, i implemented signature_of similar to the function_traits. This is more flexible, but requires C++20. #include <iostream> #include <cstdlib> #include <utility> #include <boost/type_traits/signature_of.hpp> int foo(bool, float&, const uint64_t, const double&); template <typename Type> void show_type() noexcept { std::cout << typeid(Type).name() << std::endl; } template <typename Tuple> void show_tuple_types() noexcept { auto show_elems = []<std::size_t... Idx>(const std::index_sequence<Idx...>&) noexcept { (show_type<std::tuple_element_t<Idx, Tuple>>(), ...); }; show_elems(std::make_index_sequence<std::tuple_size_v<Tuple>>{}); } int main(const int argc, const char** args) { using sig_foo = boost::signature_of<foo>; // or &foo std::cout << "foo\n"; std::cout << "result:\t\t\t" << typeid(sig_foo::result_type).name() << std::endl; std::cout << "tuple<arguments>:\t" << typeid(sig_foo::argument_type).name() << std::endl; std::cout << "argument size:\t\t" << boost::argument_size_v<foo> << std::endl; std::cout << "argument types are:\n"; show_tuple_types<typename sig_foo::argument_type>(); using sig_baz = boost::signature_of<&bar::baz>; std::cout << "\nbaz\n"; std::cout << "result:\t\t\t" << typeid(sig_baz::result_type).name() << std::endl; std::cout << "tuple<arguments>:\t" << typeid(sig_baz::argument_type).name() << std::endl; std::cout << "argument size:\t\t" << boost::argument_size_v<&bar::baz> << std::endl; std::cout << "argument types are:\n"; show_tuple_types<typename sig_baz::argument_type>(); return EXIT_SUCCESS; } (Hint: typeid ignore references) regards Gero Am 12.09.20 um 17:35 schrieb Peter Dimov via Boost:
Gero Peterhoff wrote:
Hello Developers, I would like to retrofit some type-traits in boost, but I have read https://pdimov.github.io/articles/phasing_out_cxx03.html. Now I don't know how to do it best, as the boost-type-traits may be removed.
Boost.TypeTraits is not made obsolete by C++11, so it won't be removed. It contains both non-standard traits and traits that have been added in a later standard (17, 20). F.ex.
https://www.boost.org/doc/libs/1_74_0/libs/type_traits/doc/html/boost_typetr... https://www.boost.org/doc/libs/1_74_0/libs/type_traits/doc/html/boost_typetr... https://www.boost.org/doc/libs/1_74_0/libs/type_traits/doc/html/boost_typetr... https://www.boost.org/doc/libs/1_74_0/libs/type_traits/doc/html/boost_typetr... https://www.boost.org/doc/libs/1_74_0/libs/type_traits/doc/html/boost_typetr... https://www.boost.org/doc/libs/1_74_0/libs/type_traits/doc/html/boost_typetr...
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