Mega Code Archive
Demonstrating the order in which constructors and destructors are called
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#include <string>
#include <iostream>
using std::string;
using std::cout;
using std::endl;
class MyClass
{
public:
MyClass( int, string ); // constructor
~MyClass(); // destructor
private:
int objectID;
string message;
};
MyClass::MyClass( int ID, string s )
{
objectID = ID;
message = s;
cout << "Object " << objectID << " constructor runs " << message << endl;
}
MyClass::~MyClass()
{
cout << "Object " << objectID << " destructor runs " << message << endl;
}
void create( void );
MyClass first( 1, "(global before main)" );
int main()
{
MyClass second( 2, "(local automatic in main)" );
static MyClass third( 3, "(local static in main)" );
create(); // call function to create objects
MyClass fourth( 4, "(local automatic in main)" );
return 0;
}
void create( void )
{
cout << "\nCREATE FUNCTION: EXECUTION BEGINS" << endl;
MyClass fifth( 5, "(local automatic in create)" );
static MyClass sixth( 6, "(local static in create)" );
cout << "\nCREATE FUNCTION: EXECUTION ENDS" << endl;
}
Object 1 constructor runs (global before main)
Object 2 constructor runs (local automatic in main)
Object 3 constructor runs (local static in main)
CREATE FUNCTION: EXECUTION BEGINS
Object 5 constructor runs (local automatic in create)
Object 6 constructor runs (local static in create)
CREATE FUNCTION: EXECUTION ENDS
Object 5 destructor runs (local automatic in create)
Object 4 constructor runs (local automatic in main)
Object 4 destructor runs (local automatic in main)
Object 2 destructor runs (local automatic in main)
Object 6 destructor runs (local static in create)
Object 3 destructor runs (local static in main)
Object 1 destructor runs (global before main)
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