获取被调用函数内部的内存

一 通过返回动态内存的指针

#include <iostream>

using namespace std;

int* test(int count)
{
    int* p = (int*)malloc(sizeof(int) * count);
    if (p)
    {
        *(p + 0) = 5;
    }
    return p;
}

int main()
{
    int* p = test(3);
    *(p + 1) = 6;
    *(p + 2) = 7;

    for (int i = 0; i < 3; i++)
    {
        cout << *(p + i) << endl;
    }

    free(p);
    return 0;
}

二 通过二级指针来保存

#include <iostream>

using namespace std;

void test(int** p, int count)
{
    *p = new int[count];

    if (*p)
    {
        *(*p + 0) = 5;

    }
}

int main()
{
    int* p = NULL;
    test(&p, 3);
    *(p + 1) = 6;
    *(p + 2) = 7;

    for (int i = 0; i < 3; i++)
    {
        cout << *(p + i) << endl;
    }

    delete[] p;
    return 0;
}