07
Dec
What are the two steps that happen when I say delete p?
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delete p is a two-step process: it calls the destructor, then releases the memory. The code generated for delete p is functionally similar to this (assuming p is of type Fred*):
// Original code: delete p;
if (p != NULL) {
p->~Fred();
operator delete(p);
}
if (p != NULL) {
p->~Fred();
operator delete(p);
}
The statement p->~Fred() calls the destructor for the Fred object pointed to by p.
The statement operator delete(p) calls the memory deallocation primitive, void operator delete(void* p). This primitive is similar in spirit to free(void* p). (Note, however, that these two are not interchangeable; e.g., there is no guarantee that the two memory deallocation primitives even use the same heap!)
source:usenet
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Related Blog Items - Does delete delete the pointer, or the pointed-to-data?
- Do I need to check for NULL before delete?
- Differences between new, malloc; delete, free
- C/C++ Questions asked in various job interviews
- Binary Search Trees
Related Blog Items
- Does delete delete the pointer, or the pointed-to-data?
- Do I need to check for NULL before delete?
- Differences between new, malloc; delete, free
- C/C++ Questions asked in various job interviews
- Binary Search Trees
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