문법에 맞지 않는 learn.microsoft.com의 C++ 소스 코드

C#에서 Win32 API 연동을 위해 Interop 구조체를 docs 문서에서 참고했는데,

IORING_HANDLE_REF structure (ioringapi.h)
; https://learn.microsoft.com/en-us/windows/win32/api/ioringapi/ns-ioringapi-ioring_handle_ref

typedef struct IORING_HANDLE_REF {
  void            IORING_HANDLE_REF(
    HANDLE h
  );
  void            IORING_HANDLE_REF(
    UINT32 index
  );
  IORING_REF_KIND Kind;
  union {
    HANDLE Handle;
    UINT32 Index;
  } HandleUnion;
  HandleUnion     Handle;
} IORING_HANDLE_REF;

typedef struct IORING_HANDLE_REF
{
    explicit IORING_HANDLE_REF(HANDLE h)
        : Kind(IORING_REF_KIND::IORING_REF_RAW)
        , Handle(h)
    {}

    explicit IORING_HANDLE_REF(UINT32 index)
        : Kind(IORING_REF_KIND::IORING_REF_REGISTERED)
        , Handle(index)
    {}

    IORING_REF_KIND Kind;
    union HandleUnion
    {
        HandleUnion(HANDLE h)
            : Handle(h)
        {}

        HandleUnion(UINT32 index)
            : Index(index)
        {}

        // Handle to the file object if Kind == IORING_REF_RAW
        HANDLE Handle;

        // Index of registered file handle if Kind == IORING_REF_REGISTERED
        UINT32 Index;
    } Handle;
} IORING_HANDLE_REF;