What's the best way to trim std::string?

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\\         


        

Answer 1

Using Boost's string algorithms would be easiest:

#include 

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.

---

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.