HEAP_MEMORY_INFO_CLASS - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H

typedef enum _HEAP_MEMORY_INFO_CLASS
{
    HeapMemoryBasicInformation
} HEAP_MEMORY_INFO_CLASS;

#endif

View code on GitHub

This enumeration is documented in Windows Driver Kit.