do while 宏定义如何使用?

#define verification(lhs,rhs,str) do { \
        if (lhs == rhs) { \
            std::cout << rang::style::bold << rang::fg::green << "[Success]" << rang::style::reset << " " << str << std::endl; \
        }else { \
            std::cout << rang::style::bold << rang::fg::red << "[Fail]" << rang::style::reset << "    " << str << std::endl; \
        } \
    } while (0)