C 语言最大难点揭秘[3]

 /********
  * ...
  * Note that f8() is documented to return a value
  * which needs to be returned to heap; as f7 thinly
  * wraps f8, any code which invokes f7() must be
  * careful to free() the return value.
  *
  ********/
 int *f7()
 {
     int *p;

     p = f8(...);
     ...
     return p;
 }

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