根据邮件长度打印自定义数量的标头分隔符

Question

说我要打印:

============
Some message
============

和:

=======================
Other Message long one
=======================

"="的数量根据消息长度而变化.打印这种东西最有效的方法是什么？

没有提升,请STL.

Answer 1

std::string line(msg.length(), '=');
cout << line << "\n" << msg << "\n" << line << endl;