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Tip of the Day
Language: C++
Expertise: All
Nov 12, 1999

Limitations on the Location of a Default Arguments Declaration

Default arguments shall be specified only in the parameter-declaration-clause of a function declaration or in a template-parameter. This means that default arguments cannot appear in declarations of pointers to functions, references to functions, or typedef declarations:
         
  void f( int n = 0); //OK
  //the following declarations are all illegal
  void (&rf) (int n = 0) = f;  //reference to function
  void (*pf) (int n = 0) ;   //pointer to function
  typedef void (*pfi) (int n = 0);  //typedef
Danny Kalev
 
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