__ptr32, __ptr64
The latest version of this topic can be found at __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.
Note
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