Class false_type

test/doctest.h:954–954

        struct true_type { static DOCTEST_CONSTEXPR bool value = true; };
        struct false_type { static DOCTEST_CONSTEXPR bool value = false; };

        template <typename T> struct remove_reference { using type = T; };
        template <typename T> struct remove_reference<T&> { using type = T; };