CODEWITHSUNDEEP
c++
user3215228
user3215228

Reputation: 313

Destructor delete dynamic array declared in main

I have declared dynamic array inside int main so my question is that how to delete and release that array in the destructor?? or else I should release that inside main.
delte[] ptr ---
Please answer this simple question to me. Thanks in advance

I have also implement class but declared dynamic array inside main so whats the use of destructor? should I delete inside destructor?

Upvotes: 0

Views: 444

Answers (2)

Nikos Athanasiou
Nikos Athanasiou

Reputation: 31519

Every scope has exit points. You make use of this and destructors to implement the RAII idiom. Since you have no class to wrap your data in, you can use the boost library to define actions to be taken on scope exit. 

{ // some scope, maybe that of a main function
    double *new_ar = new double[15];
    BOOST_SCOPE_EXIT(new_ar) {
        delete[] new_ar;
    } BOOST_SCOPE_EXIT_END
} // end of scope

Upvotes: 0

Joseph Mansfield
Joseph Mansfield

Reputation: 110658

The program itself doesn't have a destructor. It starts at the beginning of main and ends at the end of main. If you need to deallocate some memory you allocated at the beginning of main, you should do it before main ends:

int main() {
  int* arr = new int[10];

  // Do lots of work

  delete[] arr;
}

Of course, it would be much better if you encapsulated this memory allocation inside a class using RAII, so that you don't have to deal with it manually. In fact, types already exist for this - the standard library containers (such as std::vector or std::array).

Upvotes: 1

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