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jeremy-rifkin/typename.hpp

Created September 8, 2021 03:05
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  1. jeremy-rifkin created this gist Sep 8, 2021.
    22 changes: 22 additions & 0 deletions typename.hpp
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,22 @@
    template<class T> constexpr std::string_view type_name() {
    // clang: std::string_view ns::type_name() [T = int]
    // gcc: constexpr std::string_view ns::type_name() [with T = int; std::string_view = std::basic_string_view<char>]
    // msvc: const char *__cdecl ns::type_name<int>(void)
    auto substring_bounded_by = [](std::string_view sig, std::string_view l, std::string_view r) {
    assert(sig.find(l) != std::string_view::npos);
    assert(sig.rfind(r) != std::string_view::npos);
    assert(sig.find(l) < sig.rfind(r));
    auto i = sig.find(l) + l.length();
    return sig.substr(i, sig.rfind(r) - i);
    };
    #if defined(__clang__)
    return substring_bounded_by(__PRETTY_FUNCTION__, "[T = ", "]");
    #elif defined(__GNUC__) || defined(__GNUG__)
    return substring_bounded_by(__PRETTY_FUNCTION__, "[with T = ", "; std::string_view = ");
    #elif defined(_MSC_VER)
    return substring_bounded_by(__FUNCSIG__, "type_name<", ">(void)");
    #else
    // TODO: ?
    return __PRETTY_FUNCTION__;
    #endif
    }