Inline functions

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1. Inline function In C++ we usually define the following function to find the maximum value of two integers: Copy code The code is as follows: int max(int a, int b) { return a > b ? a : b; } The benefits of defining a function for such a small operation are: ① It is much easier to read and understand the call to the function max than to read an equivalent conditional expression and interpret its meaning ② If any modifications need to be made, it is much easier to modify the function than to find and modify each equivalent expression ③ Using functions can ensure uniform behavior, and each test is guaranteed to be implemented in the same way ④ Functions can be reused without having to rewrite code for other applications Although there are so many benefits, there is a potential disadvantage of writing it as a function: calling a function is much slower than solving an equivalent expression. On most machines, calling a function requires a lot of work: registers must be saved before the call and restored when returning, actual parameters must be copied, and the program must also switch to a new location to execute. C++ supports inline functions, whose purpose is to improve the execution efficiency of functions. You can specify a function as an inline function by putting the keyword in front of the function definition (note that it is a definition rather than a declaration, which will be discussed below). An inline function is usually expanded "inline" at each call point in the program. Suppose we define max as an inline function: Copy code The code is as follows: inline int max(int a, int b) { return a > b ? a : b; } Then call: cout< b ? a : b)<b ? a : b; } Main.cpp : Copy the code The code is as follows: #include
#include "A.h"
using namespace std;

inline int A::max()
{
return a > b ? a : b;
}

int main()
{
A a(3, 5);
cout<

Inline functions are rarely used in MCU programming. Generally, they are used in some short functions on ARM, and others don’t pay much attention to them. Thanks for sharing. I have studied them in depth. Thank you!

Inline functions

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Inline functions are rarely used in MCU programming. Generally, they are used in some short functions on ARM, and others don’t pay much attention to them. Thanks for sharing. I have studied them in depth. Thank you!