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

Using Boost's string algorithms would be easiest:

#include <boost/algorithm/string.hpp>

std::string str("hello world! ");
boost::trim_right(str);

str is now "hello world!". There's also trim_left and trim, which trims both sides.

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If you add _copy suffix to any of above function names e.g. trim_copy, the function will return a trimmed copy of the string instead of modifying it through a reference.

If you add _if suffix to any of above function names e.g. trim_copy_if, you can trim all characters satisfying your custom predicate, as opposed to just whitespaces.