修剪 std: : string 的最佳方法是什么？

Question

I'm currently using the following code to right-trim all the std::strings in my programs:

std::string s;
s.erase(s.find_last_not_of(" \n\r\t")+1);

It works fine, but I wonder if there are some end-cases where it might fail?

Of course, answers with elegant alternatives and also left-trim solution are welcome.

转载于:https://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring

Answer 1

In the case of an empty string, your code assumes that adding 1 to string::npos gives 0. string::npos is of type string::size_type, which is unsigned. Thus, you are relying on the overflow behaviour of addition.