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C++: The Complete Reference
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void C1::set_status(int state) { status = state; } void C2::set_status(int state) { status = state; } int idle(C1 a, C2 b) { if(astatus || bstatus) return 0; else return 1; } int main() { C1 x; C2 y; xset_status(IDLE); yset_status(IDLE); if(idle(x, y)) cout << "Screen can be used\n"; else cout << "In use\n"; xset_status(INUSE); if(idle(x, y)) cout << "Screen can be used\n"; else cout << "In use\n"; return 0; }
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Notice that this program uses a forward declaration (also called a forward reference) for the class C2 This is necessary because the declaration of idle( ) inside C1 refers to C2 before it is declared To create a forward declaration to a class, simply use the form shown in this program A friend of one class may be a member of another For example, here is the preceding program rewritten so that idle( ) is a member of C1:
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#include <iostream> using namespace std; const int IDLE = 0; const int INUSE = 1; class C2; // forward declaration
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class C1 { int status; // IDLE if off, INUSE if on screen // public: void set_status(int state); int idle(C2 b); // now a member of C1 }; class C2 { int status; // IDLE if off, INUSE if on screen // public: void set_status(int state); friend int C1::idle(C2 b); }; void C1::set_status(int state) { status = state; } void C2::set_status(int state) { status = state; } // idle() is member of C1, but friend of C2 int C1::idle(C2 b) { if(status || bstatus) return 0; else return 1; } int main() {
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C++: The Complete Reference
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C1 x; C2 y; xset_status(IDLE); yset_status(IDLE); if(xidle(y)) cout << "Screen can be used\n"; else cout << "In use\n"; xset_status(INUSE); if(xidle(y)) cout << "Screen can be used\n"; else cout << "In use\n"; return 0; }
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Because idle( ) is a member of C1, it can access the status variable of objects of type C1 directly Thus, only objects of type C2 need be passed to idle( ) There are two important restrictions that apply to friend functions First, a derived class does not inherit friend functions Second, friend functions may not have a storage-class specifier That is, they may not be declared as static or extern
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Friend Classes
It is possible for one class to be a friend of another class When this is the case, the friend class and all of its member functions have access to the private members defined within the other class For example,
// Using a friend class #include <iostream> using namespace std; class TwoValues { int a; int b; public: TwoValues(int i, int j) { a = i; b = j; } friend class Min; }; class Min {
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Classes and Objects
public: int min(TwoValues x); }; int Min::min(TwoValues x) { return xa < xb xa : xb; } int main() { TwoValues ob(10, 20); Min m; cout << mmin(ob); return 0; }
In this example, class Min has access to the private variables a and b declared within the TwoValues class It is critical to understand that when one class is a friend of another, it only has access to names defined within the other class It does not inherit the other class Specifically, the members of the first class do not become members of the friend class Friend classes are seldom used They are supported to allow certain special case situations to be handled
Inline Functions
There is an important feature in C++, called an inline function, that is commonly used with classes Since the rest of this chapter (and the rest of the book) will make heavy use of it, inline functions are examined here In C++, you can create short functions that are not actually called; rather, their code is expanded in line at the point of each invocation This process is similar to using a function-like macro To cause a function to be expanded in line rather than called, precede its definition with the inline keyword For example, in this program, the function max( ) is expanded in line instead of called:
#include <iostream> using namespace std;
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