c++ - Size of a class increases if destructor is included -

class myclass {         int data;         public:         myclass() : data(0) { /*cout << "ctor" << endl;*/}         void* operator new(size_t sz) { cout << "size in new: " << sz << endl; void* s = malloc(sz); return s; }         void* operator new[] (size_t sz) { cout << "size: " << sz << endl; void* s = malloc(sz); return s; }          void operator delete(void* p) { free(p); }         void operator delete[](void* p) { free(p); }         ~myclass() {} }; int main() {         // code goes here         myclass* p = new myclass[1];         delete[] p;         cout << "size of class: " << sizeof(myclass) << endl;           return 0; } 

here overloading new , delete operator. strange behaviour observe here if include destructor size passed new operator increased 4 , size of myclass still 4 obvious.

the output getting destructor:
size: 8
size of class: 4

the output getting without destructor:
size: 4
size of class: 4

why inclusion of destructor increases size?

think how delete[] works. if there's no destructor, needs pass address free. if there destructor, has know how many elements in array knows how many times invoke destructor. space needed hold size of array.