Chop trailing characters from a string

chop_string.cpp

void chop( std::string& str, const std::string& whitespaces=" \t\f\v\n\r" )
{
  size_t found = str.find_last_not_of( whitespaces );
  if ( found!=std::string::npos )
    str.erase( found+1 );
  else
    str.clear();
}