memory leak from vector

Question

I'm seeing I'm getting a memory leak from my vector I have, I've tried deleting the contents then clearing the vector, erasing the vector as well. My Crtdb is still informing me of memory leaks, I know it involves the vector because when i comment all vector related things i get no leaks. Here is all my code is doing.

#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#include <vector>
#include "MyClass.h"

int main(void){
    Obj *a = new Obj();
    std::vector<Obj> vec;
    vec.push_back(*a);

    Obj b = vec[0];

    vec.erase(vec.begin(),vec.end());
    delete a;
    _CrtDumpMemoryLeaks();
    return 0;
}

and `Obj` would be? A possible source of the leak is faulty memory management of `Obj`. — Csq, Jun 27 '14 at 21:02
Your vector hasn't gone out of scope yet when you call the leak checker. — Carl Norum, Jun 27 '14 at 21:02
I'm pretty sure it's `Obj` that leaks, rather than `std::vector`, also ensure that `class Obj` does everything right about the [rule-of-three](http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three). — πάντα ῥεῖ, Jun 27 '14 at 21:03
`std::vector::erase()` does not promise to return memory. Destroying the vector does. — Drew Dormann, Jun 27 '14 at 21:04

score 6 · Accepted Answer · answered Jun 27 '14 at 21:09

6

Your vector hasn't gone out of scope yet when you call the leak checker.

answered Jun 27 '14 at 21:09

Carl Norum

219,201
40
422
469

And @Drew Dormann said in a comment, std::vector::erase() does not promise to release memory. You don't really want it to, either because if you reuse the vector which is normal behavior after an erase(), it would have to allocate more memory to replace what it had just deallocated. – Dale Wilson Jun 27 '14 at 21:15

memory leak from vector

1 Answers1