old_friend_lookup

Implements non-standard C++ friend declaration behavior that allows friend declarations to be visible in the enclosing scope.

  #pragma old_friend_lookup on | off | reset

Example

This example shows friend declarations that are invalid without #pragma old_friend_lookup.

Listing: Valid and invalid declarations without #pragma old_friend_lookup

class C2; 
void f2(); 
struct S { 
 friend class C1; 
 friend class C2; 
 friend void f1(); 
 friend void f2(); 
}; 
C1 *cp1; // error, C1 is not visible without namespace declaration 
C2 *cp2; // OK 
int main() 
{ 
 f1(); // error, f1() is not visible without namespace declaration 
 f2(); // OK 
}