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// Using declaration test: Shows overloading, overriding, and hiding.
// From an example in the ISO C++ standard.
// The effect of commenting out the various using declarations is to
// hide the inherited functions in all cases.
// (C) 2000 by Wayne Pollock, Tampa FL USA.  All Rights Reserved.

#include <iostream>
using namespace std;

struct B {
   void f(int)  { cout << "B::f(int)\n";  }
   void f(char) { cout << "B::f(char)\n"; }
   void g(int)  { cout << "B::g(int)\n";  }
   void h(int)  { cout << "B::h(int)\n";  }
};

struct D : B {
   using B::f;
   void f(int) {cout << "D::f(int)\n";}    // overrides B::f(int)

   using B::g;
   void g(char) {cout << "D::g(char)\n";}  // overloads B::g(int)

   using B::h;
   void h(int) {cout << "D::h(int)\n";}    // hides B::h(int)
};

int main () {
   D* p = new D;  // Quiz: what's the output if p is a B* pointer instead?
   cout << "calling p->f( 7 ): ";  p->f(7);
   cout << "calling p->f('a'): ";  p->f('a');
   cout << "calling p->g( 7 ): ";  p->g(7);
   cout << "calling p->g('a'): ";  p->g('a');
   cout << "calling p->h( 7 ): ";  p->h(7);
   return 0;
};


#ifdef COMMENTED_OUT

C:\Temp>make using.exe
MAKE Version 5.2  Copyright (c) 1987, 2000 Borland
        bcc32  using.cpp
Borland C++ 5.5 for Win32 Copyright (c) 1993, 2000 Borland
using.cpp:
Warning W8004 using.cpp 29: 'p' is assigned a value that is never used in function main()
Turbo Incremental Link 5.00 Copyright (c) 1997, 2000 Borland

C:\Temp>using
calling p->f( 7 ): D::f(int)
calling p->f('a'): B::f(char)
calling p->g( 7 ): B::g(int)
calling p->g('a'): D::g(char)
calling p->h( 7 ): D::h(int)

C:\Temp>

#endif