INT_PTR_MAX - NtDoc

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
#ifdef _WIN64

#define INT_PTR_MAX     9223372036854775807i64

#endif
#endif
#endif
View code on GitHub

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
#ifdef _WIN64
// ...
#else

#define INT_PTR_MAX     2147483647 

#endif
#endif
#endif
View code on GitHub