Exception Handling and Object Destruction in C++
About Exception handling and object destruction :
Exception handling and objection destruction are important features in c++ to handle properly for execution of the program. We will discuss about these below.
Exception Handling in C++ :
Object Destruction in C++:
Example 1 :
#include<iostream>
using namespace std;
class check {
public:
check()
{
cout << "Constructing an object of class check "<< endl;
}
~check()
{
cout << "Destructing the object of class check "<< endl;
}
};
int main()
{
try {
check t1;
throw 5;
}
catch (int i) {
cout << "Caught " << i << endl;
}
}
Output :
Constructing an object of class check Destructing the object of class check Caught 5
In the above program, when an exception is thrown, destructors of the objects (whose scope ends with the try block) are automatically called before the catch block gets executed.
Example 2:
#include<iostream>
using namespace std;
class check1 {
public:
check1()
{
cout << "Constructing an Object of class check1"<< endl;
}
~check1()
{
cout << "Destructing an Object the class check1"<< endl;
}
};
class check2 {
public:
check2()
{
cout << "Constructing an Object of class check2"<< endl;
throw 5;
}
~check2()
{
cout << "Destructing the Object of class check2"<< endl;
}
};
int main()
{
try {
check1 t1;
check2 t2;
check1 t3;
}
catch (int i) {
cout << "Caught " << i << endl;
}
}
Output :
Constructing an Object of class check1 Constructing an Object of class check2 Destructing an Object the class check1 Caught 5
In the above program,exception is thrown from the constructor. Here the destructor for that object is not called, When the constructor of an object throws an exception.
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