__ptr32, __ptr64

Microsoft Specific

__ptr32 represents a native pointer on a 32-bit system, while __ptr64 represents a native pointer on a 64-bit system.

The following example shows how to declare each of these pointer types:

int * __ptr32 p32;
int * __ptr64 p64;

On a 32-bit system, a pointer declared with __ptr64 is truncated to a 32-bit pointer. On a 64-bit system, a pointer declared with __ptr32 is coerced to a 64-bit pointer.

备注

You cannot use __ptr32 or __ptr64 when compiling with /clr:pure. Otherwise, Compiler Error C2472 will be generated.

Example

The following example shows how to declare and allocate pointers with the __ptr32 and __ptr64 keywords.

#include <cstdlib>
#include <iostream>

int main()
{
    using namespace std;

    int * __ptr32 p32;
    int * __ptr64 p64;

    p32 = (int * __ptr32)malloc(4);
    *p32 = 32;
    cout << *p32 << endl;

    p64 = (int * __ptr64)malloc(4);
    *p64 = 64;
    cout << *p64 << endl;
}

32
64

See Also

Reference

Fundamental Types