TITLE: Typedefs and const

PROBLEM: acube@eecg.toronto.edu (Aditya Aggarwal):, 17 Nov 93

I was  using the typedef in the following way 

typedef struct 
{
   ......
}  EMPLOYEE, *PEMPLOYEE;

where ever a pointer to EMPLOYEE was needed PEMPLOYEE was used
for example
{
    PEMPLOYEE newEmployee;
   ......
}

My problem is as follows [...]

void UpdateList ( const PEMPLOYEE pNewEmployee );

main ( )
{
  EMPLOYEE    employee;
  ...
  UpdateList ( &employee );

}

[...] But the compiler gives a undefined function call error 

Update ( EMPLOYEE* );  not defined

If I change the prototype as 

void UpdateList ( const EMPLOYEE *pNewEmployee );

then the compiler is able to compile properly.
I don't understand why compiler is able to understand that

const EMPLOYEE * is same as const PEMPLOYEE;


RESPONSE: grumpy@cbnewse.cb.att.com (Paul J Lucas), 
	                       AT&T Bell Laboratories

typedefs are *not* macro substitutions.  A const PEMPLOYEE is the
same as EMPLOYEE *const, i.e., a const pointer to an EMPLOYEE
and *not* a pointer to a const EMPLOYEE.