istringstream

istringstream    is ( " hello   world " );   
   string    s,str;   
  str    =     is .str()   ;    // str   =   hello   world   
   is     >>    s;                    // s   =   hello   
  str    =     is .str()   ;    // str   =   hello   world  

转载于:https://www.cnblogs.com/NeuqUstcIim/archive/2008/09/16/1292063.html