CODEWITHSUNDEEP
c++memory-managementmemory-leaks
Pheu Verg
Pheu Verg

Reputation: 230

objective c++ operator delete

I have the following code in Xcode command line app:

#import <Foundation/Foundation.h>

#include <string>
#include <vector>
#include <iostream>

using namespace std;

int main(int argc, const char * argv[])
{
    vector<string> *pv = new vector<string>;
    vector<string> &v = *pv;


    v.push_back("juy");
    v.push_back("zxc");

    cout << v[0] << endl << v[1] << endl;

    delete pv;

    cout << v[0] << endl << v[1] << endl;

    cout << pv->operator[](0) << endl << pv->operator[](1) << endl;
    return 0;
}

When I run it, this is the output:

juy  
zxc  
juy  
zxc  
juy  
zxc

The question is: does operator delete work in objective-c++? Does it cause memory leak?

There are no errors, no exceptions, nor warnings!

Upvotes: 1

Views: 341

Answers (1)

NPE
NPE

Reputation: 500367

Your code has no memory leaks. However, it has undefined behaviour on the following two lines that come after the delete:

cout << v[0] << endl << v[1] << endl;

cout << pv->operator[](0) << endl << pv->operator[](1) << endl;

In other words, after you delete pv, you are not allowed dereference pv. If your program doesn't crash when you do, and if the memory still contains the old data, that means nothing. The behaviour is still undefined.

Upvotes: 1

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