visibility4.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

// Build don't link: 
// GROUPS passed visibility
// visibility file
// From: [e-mail] (David Binderman 3841)
// Date:     Tue, 30 Mar 93 15:48:47 +0200
// Subject:  page 242 of the ARM
// Message-ID: <9303301348.AA20751@slsvitt>

class A {
public:
     int b; // ERROR - private
};

class C : private A {                   // NOTE WELL. private, not public
public:
        int d;
};

extern "C" int printf( const char *, ...);

class E : public C {
        void f() {
                printf( "%d\n", b);// ERROR - .*
        };
};