qf

#pragma intrinsic (_InterlockedIncrement)
#pragma intrinsic (_InterlockedDecrement)
#pragma intrinsic (memcpy)

The intrinsic pragma tells the compiler that a function has known behavior. The compiler may call the function and not replace the function call with inline instructions, if it will result in better performance. Link

For Windows

__declspec(align(8)) volatile long m_lRefCount;

For Linux

__attribute__((aligned(8))) volatile long m_lRefCount;

This usage make the align for variable and require the value from variable, not from register.

保证申请的代码是在这个类对象之后，+1相当于+sizeof(class)，因为指针的+-是根据左操作数来决定的。

                inline unsigned char *GetBuffer()
                {
                  // the buffer follows immediately after this class
                  return (unsigned char *)(this + 1);
                };