Method invalid_utf8

external/utf8/checked.h:52–52

        utfchar8_t u8;
    public:
        invalid_utf8 (utfchar8_t u) : u8(u) {}
        invalid_utf8 (char c) : u8(static_cast<utfchar8_t>(c)) {}
        virtual const char* what() const UTF_CPP_NOEXCEPT UTF_CPP_OVERRIDE { return "Invalid UTF-8"; }
        utfchar8_t utf8_octet() const {return u8;}