C++ new and delete operator overloading

Question

void operator delete(void *p)
{
    printf("\nDELETE");

    // code to actually delete/free object
}


int _tmain(int argc, _TCHAR* argv[])
{

    int *p = new int(10);

    delete p;

    getchar();
    return 0;
}

I am getting error operator delete already defined

I want to override new and delete operator globally.

ideone.com also does not complain. Are you sure this is real code? — Kiril Kirov, Mar 22 '13 at 09:58
`#include ` [similar question](http://stackoverflow.com/questions/3683740/overloading-operator-new-in-c-fails-with-visual-c) — msam, Mar 22 '13 at 10:10
does [this](http://stackoverflow.com/questions/2773168/lnk2005-delete-already-defined-error-in-vc) help? — default, Mar 22 '13 at 10:11

score 0 · Answer 1 · answered Mar 22 '13 at 09:55

0

Did you only implement it or also declare it? Afaik, you only need to implement it.

answered Mar 22 '13 at 09:55

Nils Werner

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Is it defined in a `.h` file or only implemented in a `.cpp` file? – Nils Werner Mar 22 '13 at 09:56
I guess you mean _declared_, not _defined_? And I don't believe this has anything to do with this error. – Kiril Kirov Mar 22 '13 at 09:58
Sorry, you were right, I edited my answer. I thought I read about that somewhere... – Nils Werner Mar 22 '13 at 09:59

score 0 · Answer 2 · answered Mar 22 '13 at 10:09

The deallocation function can be replaced/overloaded in two ways:

in the global scope: in order to call it, the signature of the overloaded allocation functions must be visible at the place of deallocation, except for implicitly declared default deallocation functions. This allocation function will be used for all deallocations with corresponding parameters in the current program in the local scope: the overloaded operator delete must be static public member function of the class. This deallocation function will be used only for deallocations of that particular class.

C++ new and delete operator overloading

2 Answers2