Re: Exception Destructor on new

From:
ricecake@gehennom.invalid (Marcus Kwok)
Newsgroups:
comp.lang.c++
Date:
Fri, 23 Mar 2007 14:53:48 +0000 (UTC)
Message-ID:
<eu0pls$jnd$2@news-int2.gatech.edu>
Subra <mailursubbu@gmail.com> wrote:

Hi,

 I am learning C++ and need export advice on the below program.
 I have read it that whenever a exception is genrated and control
enteres the catch block it will call destructors for all the
successfuly completed constructors. But in the below case
i am doing :-
       base *ptr=new base;
       throw 44;
 But the destructor for base is not called once it enters the catch
block. Please let me know why it is so and how to come out of it.

#include<iostream>
#include<exception>
using namespace std;
class base
{
   public:
       base() { cout<<"Constructor"<<endl; }
       ~base() { cout<<"Destructor"<<endl; }
};
int main()
{
   try {
       base *ptr=new base;
       throw 44;
   }catch(...) { // I am
expecting base destructor to be called here
       cout<<" Inside catch"<<endl; // But it is not
   }
}


Alf Steinbach has given you one suggestion. However, if you do not need
to allocate base dynamically, then observe this program:

#include <iostream>

class Base {
public:
    Base() { std::cout << "Constructor\n"; }
    ~Base() { std::cout << "Destructor\n"; }
};

int main()
{
    try {
        Base b;
        throw 44;
    }
    catch (...) {
        std::cout << "Inside catch\n";
    }
}

--
Marcus Kwok
Replace 'invalid' with 'net' to reply

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