Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you what are the traps for the use of macro functions. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

In embedded software design, some engineers often define some macro functions, although the use of macro functions can reduce overhead, but the use of macro functions must be careful. For example, we define a macro function to find the larger of the two numbers to do experiments. Break the point observation value where it is called.

Through the simulation, we can see that the value of a has been added twice, and if an is used for other purposes, then accumulating twice is obviously not what we want.

Through the simulation, we can see that it has been added up once.

For macro functions, it can be replaced by inline functions. So remind everyone to be careful when using macro functions. In the program design, we can try to consider using const,enum,inline instead of # define. Of course, it does not mean that we do not use # define. It is still necessary to use it in the pre-compilation control. When we encounter any problems, it is best to do experiments and analysis on our own. Don't just stay in the imitation of others, it is possible that what other people say wrong will misunderstand you. Any problems you have encountered in the course of use are also welcome to contribute to us for discussion.

These are the traps used in the macro functions shared by the editor. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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