Method to_upper

core/string/ustring.cpp:1383–1400

}

String String::to_upper() const {
	if (is_empty()) {
		return *this;
	}

	String upper;
	upper.resize_uninitialized(size());
	const char32_t *old_ptr = ptr();
	char32_t *upper_ptrw = upper.ptrw();

	while (*old_ptr) {
		*upper_ptrw++ = _find_upper(*old_ptr++);
	}

	*upper_ptrw = 0;

	return upper;
}

String String::to_lower() const {
	if (is_empty()) {