c++ - 所有指针都是放在栈中吗

Question

所有指针都是放在栈中吗，比如函数内局部指针变量、指向动态申请的对象的局部指针变量？

Answer 1

What you said函数内局部指针变量、指向动态申请的对象的局部指针变量

int test = 0; //全局静态存储区
int* ptrTest = &test; // 这个指针自己也是在全局静态存储区上，指向的内存地址也是。

int main()
{
    int a = 2;//栈上
    int* ptr = &a;//ptr是在栈上，然后它指向的内存地址也是栈上的

    int* ptrHeap = new int(2);
    // new是在堆上申请的内存，返回的是这个申请的内存的地址
    // 然后ptrHeap是指向这个地址的，但是ptrHeap它自己是占的栈上的地址。
    delete ptrHeap;

    return 0;
}

The pointer itself occupies memory space, and then it points to other memory spaces.

Answer 2

Yes, pointing to the heap address

Answer 3

Function pointer variables themselves are not all stack variables.

Example:

int ** p = new int*;

For this example, p is a pointer to a pointer, p is also a pointer, and p points to a memory block that stores an int value. However, the memory that stores the pointer variable *p itself is the heap.

It can be seen that pointer variables are the same as ordinary variables, they can be stack variables or heap variables.

Answer 4

Definitely not. Pointers are also variables, no different from other variables. Think about vector<int*>