Copy constructor invoked when passing an object to a function : object parameters « Function « C++ Tutorial

Home
C++ Tutorial
1.Language Basics
2.Data Types
3.Operators statements
4.Array
5.Development
6.Exceptions
7.Function
8.Structure
9.Class
10.Operator Overloading
11.Pointer
12.File Stream
13.template
14.STL Introduction
15.string
16.vector
17.list
18.bitset
19.set multiset
20.valarray
21.queue stack
22.deque
23.map multimap
24.STL Algorithms Modifying sequence operations
25.STL Algorithms Non modifying sequence operations
26.STL Algorithms Binary search
27.STL Algorithms Sorting
28.STL Algorithms Merge
29.STL Algorithms Min Max
30.STL Algorithms Iterator
31.STL Algorithms Heap
32.STL Algorithms Helper
C / ANSI-C
C Tutorial
C++
Visual C++ .NET
C++ Tutorial » Function » object parameters 
7.5.3.Copy constructor invoked when passing an object to a function
#include <iostream> 
using namespace std; 
 
class MyClass 
  int val; 
  int copynumber; 
public

  MyClass(int i) { 
    val = i; 
    copynumber = 0
    cout << "Inside normal constructor\n"
  
 
  // Copy constructor 
  MyClass(const MyClass &o) { 
    val = o.val; 
    copynumber = o.copynumber + 1
    cout << "Inside copy constructor.\n"
  
 
  ~MyClass() { 
     if(copynumber == 0
       cout << "Destructing original.\n"
     else 
       cout << "Destructing copy " << 
                copynumber << "\n"
  
 
  int getVal() { return val; 
}
 
void display(MyClass ob

  cout << ob.getVal() << '\n'

 
int main() 

  MyClass a(10)
 
  display(a)
 
  return 0
}
Inside normal constructor
Inside copy constructor.
10
Destructing copy 1
Destructing original.
7.5.object parameters
7.5.1.Pass an object to a function
7.5.2.Constructors, destructors, and passing objects
7.5.3.Copy constructor invoked when passing an object to a function
7.5.4.Passing pointers to objects
7.5.5.Data slicing with passing by value
7.5.6.Passing Objects to Functions
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.