Date: 2020may21 Language: C++ Q. C++: trim space characters from start and end of std::string A. Use erase() like this:

std::string& ltrim(std::string& str, const std::string& chars = "\t\n\v\f\r ") { str.erase(0, str.find_first_not_of(chars)); return str; } std::string& rtrim(std::string& str, const std::string& chars = "\t\n\v\f\r ") { str.erase(str.find_last_not_of(chars) + 1); return str; } std::string& trim(std::string& str, const std::string& chars = "\t\n\v\f\r ") { return ltrim(rtrim(str, chars), chars); }