What is the purpose of a function try block?

Possible Duplicate:
When is a function try block useful?
Difference between try-catch syntax for function

This code throws an int exception while constructing the Dog object inside class UseResources. The int exception is caught by a normal try-catch block and the code outputs :

Cat()  
Dog()  
~Cat()  
Inside handler

#include <iostream>
using namespace std;

class Cat
{
    public:
    Cat() { cout << "Cat()" << endl; }
    ~Cat() { cout << "~Cat()" << endl; }
};

class Dog
{
    public:
    Dog() { cout << "Dog()" << endl; throw 1; }
    ~Dog() { cout << "~Dog()" << endl; }
};

class UseResources
{
    class Cat cat;
    class Dog dog;

    public:
    UseResources() : cat(), dog() { cout << "UseResources()" << endl; }
    ~UseResources() { cout << "~UseResources()" << endl; }
};

int main()
{
    try
    {
        UseResources ur;
    }
    catch( int )
    {
        cout << "Inside handler" << endl;
    }
}

Now, if we replace the definition of the UseResources() constructor, with one that uses a function try block, as below,

UseResources() try : cat(), dog() { cout << "UseResources()" << endl; } catch(int) {}

the output is the same

Cat()  
Dog()  
~Cat()  
Inside handler 

i.e., with exactly the same final result.

What is then, the purpose of a function try block ?