C++ 内存池

#include <iostream>
#include <algorithm>
using namespace std;


class A
{
public:
	static void* operator new(size_t size);
	static void operator delete(void* phead);
	static int m_iCount;
	static int m_iMalloocCount;
private:
	A* next;
	static A* m_FreePosi;
	static int m_sTrunkCount;
};

void* A::operator new(size_t size)
{
	A* tmplink;
	if (m_FreePosi == nullptr)
	{
		size_t realsize = m_sTrunkCount * size;
		m_FreePosi = reinterpret_cast<A*>(new char[realsize]);

		tmplink = m_FreePosi;
		for (; tmplink != &m_FreePosi[m_sTrunkCount - 1]; ++tmplink)
		{
			tmplink->next = tmplink + 1;
		}

		tmplink->next = nullptr;
		++m_iMalloocCount;
	}

	tmplink = m_FreePosi;
	m_FreePosi = m_FreePosi->next;
	++m_iCount;
	return tmplink;
}

void A::operator delete(void* phead)
{
	(static_cast<A*>(phead))->next = m_FreePosi;
	m_FreePosi = static_cast<A*>(phead);
}

int A::m_iCount = 0;
int A::m_iMalloocCount = 0;
int A::m_sTrunkCount = 3;
A* A::m_FreePosi = nullptr;


int main()
{

	return 0;
}