嵌入式指针实现代码

// ConsoleApplication7.cpp : 定义控制台应用程序的入口点。
#include "stdafx.h"
#include<iostream>
using namespace std;
class myallocator
{
public:
    void* allocate(size_t size)
    {
        obj *tmplink;
        if (free_allocator == nullptr)
        {
            size_t realsize = count*size;
            free_allocator = (obj*)malloc(realsize);
            tmplink = free_allocator;
            for (int i = 0; i < count - 1; ++i)
            {
                tmplink->next = (obj*)(tmplink+size);
                tmplink = tmplink->next;
            }
            tmplink->next = nullptr;
        }
        tmplink = free_allocator;
        free_allocator = free_allocator->next;
        return tmplink;
    }
    void deallocate(void* phead)
    {
        ((obj*)phead)->next = free_allocator;
        free_allocator =(obj*)phead;
    }
    struct obj
    {
        struct obj* next;
    };
private:
    int count=10;
    obj* free_allocator = nullptr;
};

class A
{
public:
    static myallocator my;
    void* operator new(size_t size)
    {
        return my.allocate(size);
    }
    void operator delete(void * phead)
    {
        return my.deallocate(phead);
    }
private:
    int x;
    int y;
};

myallocator A::my;

int main()
{
    A * a[100];
    for (int i = 0; i < 15; i++)
    {
        a[i] = new A();
        cout << a[i] << endl;
    }
    for (int i = 0; i < 15; i++)
    {
        delete a[i];
    }




    return 0;
}