c++ - Returning char array as std:string -

Is the following safe, such as without a clear cast or call the std :: string constructor? If not safe, why not?

  std: string myfunc () {char buf [128] = ""; // Put some in the buff or not the basis on the logic. Return buff; }    
 
 
 Yes it's absolutely right, the caller will get a copy of the local buffer because  std :: string  will make a deep copy from this local buffer!  
 Edit: I  buff  is a redundant string!