Class forward declaration : Class Basics « Class « C++

Home
C++
1.Bitset
2.Class
3.Console
4.Data Structure
5.Data Type
6.Deque
7.Development
8.File
9.Function
10.Generic
11.Language
12.List
13.Map Multimap
14.Overload
15.Pointer
16.Qt
17.Queue Stack
18.Set Multiset
19.STL Algorithms Binary search
20.STL Algorithms Heap
21.STL Algorithms Helper
22.STL Algorithms Iterator
23.STL Algorithms Merge
24.STL Algorithms Min Max
25.STL Algorithms Modifying sequence operations
26.STL Algorithms Non modifying sequence operations
27.STL Algorithms Sorting
28.STL Basics
29.String
30.Valarray
31.Vector
C++ » Class » Class BasicsScreenshots 
Class forward declaration
Class forward declaration


#include <iostream>
using namespace std;

class pr2;  // 

class pr1 {
  int printing;
  
public:
  pr1() { 
     printing = 0
  }
  void set_print(int status) { 
     printing = status; 
  }
  
  friend int inuse(pr1 object1, pr2 object2);
};

class pr2 {
  int printing;
  
public:
  pr2() { 
     printing = 0
  }
  void set_print(int status) { 
     printing = status; 
  }
  
  friend int inuse(pr1 object1, pr2 object2);
};

int inuse(pr1 object1, pr2 object2)
{
  if(object1.printing || object2.printingreturn 1;
  else return 0;
}

int main()
{
  pr1 p1;
  pr2 p2;

  if(!inuse(p1, p2)) 
     cout << "Printer idle\n";

  cout << "Setting p1 to printing...\n";
  p1.set_print(1);
  if(inuse(p1, p2)) 
     cout << "Now, printer in use.\n";

  cout << "Turn off p1...\n";
  p1.set_print(0);
  if(!inuse(p1, p2)) 
     cout << "Printer idle\n";

  cout << "Turn on p2...\n";
  p2.set_print(1);
  if(inuse(p1, p2)) 
     cout << "Now, printer in use.\n";

  return 0;
}


           
       
Related examples in the same category
1.Simplest class definitionSimplest class definition
2.A simple class with member variable, constructor, destructorA simple class with member variable, constructor, destructor
3.Address class: class definition and implementationAddress class: class definition and implementation
4.Declare class instanceDeclare class instance
5.Constructor: different parameter typeConstructor: different parameter type
6.Declare Class instance and use themDeclare Class instance and use them
7.Assign object1 to object2Assign object1 to object2
8.Init Object arrayInit Object array
java2s.com  | Contact Us | Privacy Policy
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.