C (type)-1?

A long-plagued problem has finally been solved. Thanks to the omnipotent network ~

When looking at the project code, I saw a lot of macro definitions "type-1". Why can I subtract types ??

Typedef unsignedInt Uint;# DefineA (uint)-1

I thought it was a subtraction.

(Uint)-1 is actually a forced type conversion, converting-1 to the unsigned integer number.

I have encountered a similar situation before. I did not understand the "->" operator.

Okay ~ Eat a grain, grow wisdom ~

 

Appendix: http://zhidao.baidu.com/question/462582782.html

C (type)-1?