Use of inline functions in code optimization

Let's talk about the advantages of inline functions:
Rewrite a function to an inline function to avoid stack operations when the function is called. This naturally improves code execution efficiency.

Generally, the inline function is written in the header file, and it is recommended to write it outside the class structure, that is, the class structure definition, rather than writing it in the class structure.
Of course, nothing can be written in it, but if it is written outside, the code looks more neat and will naturally increase the ease of coding.

1. the inline function should be used:
When the function body is small, for example, there are only two or three rows, you can consider rewriting it into an inline function.
When a function needs to be called multiple times in a loop or in other locations, you can consider using

2. the inline function is not recommended:
When the function body is large, such as 20 or more rows, we do not recommend using the inline function.
We do not recommend that you use the inline function for functions that require recursive operations.

Use of inline functions in code optimization