Is the sizeof(some pointer) always equal to four?

Question

For example: sizeof(char*) returns 4. As does int*, long long*, everything that I\'ve tried. Are there any exceptions to this?

Answer 1

In Win64 (Cygwin GCC 5.4), let's see the below example:

First, test the following struct:

struct list_node{
    int a;
    list_node* prev;
    list_node* next;
};

struct test_struc{
    char a, b;
};

The test code is below:

std::cout<<"sizeof(int):            "<

The output is below:

sizeof(int):            4
sizeof(int*):           8

sizeof(double):         8
sizeof(double*):        8

sizeof(list_node):      24
sizeof(list_node*):     8

sizeof(test_struc):     2
sizeof(test_struc*):    8

You can see that in 64-bit, sizeof(pointer) is 8.