Method invalid_code_point

external/utf8/checked.h:44–44

        utfchar32_t cp;
    public:
        invalid_code_point(utfchar32_t codepoint) : cp(codepoint) {}
        virtual const char* what() const UTF_CPP_NOEXCEPT UTF_CPP_OVERRIDE { return "Invalid code point"; }
        utfchar32_t code_point() const {return cp;}
    };