#include <iostream>
#include <cstdlib>
#include "cookie.h"
using namespace std;

char cookie::buffer[n * sizeof (cookie)];
bool cookie::b[n];

void *cookie::operator new(size_t)
{
	for (size_t i = 0; i < n; ++i) {
		if (!b[i]) {
			b[i] = true;
			cout << "cookie::operator new allocates subscript "
				<< i << ".\n";
			return reinterpret_cast<cookie *>(buffer) + i;
		}
	}

	cerr << "cookie::operator new out of store\n";
	exit(EXIT_FAILURE);
}

void cookie::operator delete(void *p)
{
	const ptrdiff_t d = static_cast<char *>(p) - buffer;

	if (d < 0 || d % sizeof (cookie) != 0) {
		cerr << "cookie::operator delete argument " << p
			<< " didn't come from cookie::operator new.\n";
		exit(EXIT_FAILURE);
	}

	const size_t i =
		static_cast<cookie *>(p) - reinterpret_cast<cookie *>(buffer);

	if (i >= n) {
		cerr << "cookie::operator delete argument " << p
			<< " didn't come from cookie::operator new.\n";
		exit(EXIT_FAILURE);
	}

	cout << "cookie::operator delete deallocates subscript " << i << ".\n";
	b[i] = false;
}