#include <windows.h>

extern "C" BOOL WINAPI CheckTokenMembership(HANDLE,PSID,PBOOL);
#define export extern "C" __declspec (dllexport) __stdcall

export double user_is_admin() {
    BOOL b = false;
    SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
    PSID AdministratorsGroup;
    if(!AllocateAndInitializeSid(&NtAuthority,2,SECURITY_BUILTIN_DOMAIN_RID,DOMAIN_ALIAS_RID_ADMINS,0,0,0,0,0,0,&AdministratorsGroup)) {
        return -1;
    }
    if (!CheckTokenMembership(NULL,AdministratorsGroup,&b)) {
        FreeSid(AdministratorsGroup);
        return -1;
    }
    FreeSid(AdministratorsGroup);
    if(b) return 1;
    else return 0;
}