#include <iostream>
#include <cstdint>
#include <cstddef>
using std::size_t;
 
struct head_t { size_t size; int data[]; };
 
int main() {
	head_t* h = static_cast<head_t*>(::operator new(sizeof(head_t) + 10 * sizeof(int)));
	h->size = 10;
	int* my_10_ints = h->data;
	// Oh noez! I forgot 10!
	size_t what_was_10_again = static_cast<head_t*>(static_cast<void*>(my_10_ints) - offsetof(head_t, data))->size;
	::std::cout << what_was_10_again << "\n";
	::operator delete(static_cast<void*>(my_10_ints) - offsetof(head_t, data));
}

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