const std::string s1 = "abc";
const std::string & s2 = "abc";
s2的定义合法吗？如果是这样，s1 和 s2 之间有什么区别？
谢谢。
最佳答案
是的，s2 是合法的。 s2 绑定(bind)到临时 std::string - 延长临时生命周期。 s1 不是临时变量，而是命名变量。
参见 12.2/5:
The second context is when a reference is bound to a temporary. The temporary to which the reference is bound or the temporary that is the complete object to a subobject of which the temporary is bound persists for the lifetime of the reference except as specified below.
关于C++ : const reference to local object，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5635568/