std::string::trimExtensions for std::string to trim() whitespace.

stringtrim.hpp

// Extensions for std::string to trim whitespace
string& trimR( string& str )
{
  if( !str.size() ) return str;
  // find the last whitespace chr, then delete from there to end.
  string::iterator iter = --str.end() ;
  while( isspace( *iter ) ) --iter;
  str.erase( ++iter, str.end() ) ;
  return str ;
}
 
string& trimL( string& str )
{
  if( !str.size() ) return str;
  // find first non-whitespace, then delete from begin to there.
  string::iterator iter = str.begin() ;
  while( iter != str.end() && isspace( *iter ) ) ++iter;
  str.erase( str.begin(), iter ) ;
  return str ;
}
 
string& trim( string& str )
{
  return trimR( trimL( str ) ) ;
}