CODEWITHSUNDEEP
c++new-operatorfreedynamic-memory-allocation
Jayesh
Jayesh

Reputation: 4903

What will happens if before freeing memory allocated by new operator, exception occurred?

I just curious to know, What will happens if before freeing memory allocated by new operator, exception occurred? Is it memory leak problem occurred?

#include <iostream>
#include<new>

using namespace std;

void func()
{
    try
    {
        int *p = new int[10];

        /*
            Number of lines code here
            .
            .
            .
            .
            .
            Suppose here I got exception then What heppens????
            .
            .
            .
            .
        */
        delete []p;
    }
    catch(const std::exception& e)
    {
        cout<<"Exception occured"<<endl;
    }
}

int main() {
    func();
    return 0;
}

Upvotes: 0

Views: 71

Answers (2)

Timmy_A
Timmy_A

Reputation: 1232

Memory leak occurs because operator delete has never been called. Use std::unique_ptr<T> instead of the raw C++ pointers. C++ standard library provides std::unique_ptr<T> that automatically de-allocates wrapped pointer when it's out of scope. C++ standard library also provides std::shared_ptr<T>, that uses reference counting and de-allocates memory only if the last reference to the pointer is released.

Upvotes: 2

StoryTeller - Unslander Monica
StoryTeller - Unslander Monica

Reputation: 170193

Is it memory leak problem occurred?

Yes. This is the whole reason smart pointers and the whole RAII idiom were devised. Destructors of block scoped variable are still called when a handler is found, so those can free the allocated resources. A raw pointer will just leak.

Upvotes: 6

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