CareerCup

use a smart pointer.

use initializer list and smart ptrs

use auto_ptr<> for auto delete if there is exception.

class B {
int *p;
public:
B(){
auto_ptr<int> ap(new int);
// Do something with potential exception
p=ap.release();
}
};

What if I simply do this,


class A{
int* x;
int* y;
int* z;
public:
A(){

try{
x = new int(10);
y = new int(11);
z = new int(12);
}catch(...){
delete x;
delete y;
delete z;
}

}//end of A constructor

~A(){
delete x;
delete y;
delete z;
}
};

Guys, The only way to do this is by using the so called C++ construct of Function try blocks. Read the concept of function try blocks on the following page: www dot physics dot irfu dot se / aCCdoc / except.htm

duplicate Q. Ans: By using function try-blocks. The key word here is 'function'

Read this: gotw[dot]ca/gotw/066[dot]htm

They have explained why do you need function try blocks for constructors. Somewhere in that article.. it says if exception occurs in function try block then whatever objects that were successfully created will be destructed by calling their destructors.

// Example 1(a): Constructor function-try-block
//
C::C()
try
  : A ( /*...*/ ) // optional initialization list
  , b_( /*...*/ )
{
}
catch( ... )
{
  // We get here if either A::A() or B::B() throws.

  // If A::A() succeeds and then B::B() throws, the
  // language guarantees that A::~A() will be called
  // to destroy the already-created A base subobject
  // before control reaches this catch block.
}

through smart pointers