In C language, inline functions are an optimization technique used to improve program execution efficiency. Inline functions allow the definition of a function to be inserted at the call site, rather than being executed through a function call. This can reduce the overhead of function calls and improve the running speed of the program. This article will introduce in detail why inline function programming is used in C language and provide corresponding source code examples.
- Reduce function calling overhead:
In C language, function calling involves a series of operations, such as saving the context of the current function, jumping to the address of the called function, passing parameters, returning values, etc. These operations introduce additional overhead, especially in small functions that are called frequently, and this overhead can significantly affect the performance of your program.
By using inline functions, the definition of the function can be inserted at the call site, avoiding the overhead of function calls. The compiler will insert the code of the inline function directly into the calling point during compilation, making the execution path of the program more compact. This can reduce the overhead of function calls and improve program execution efficiency.
Here is a simple example code showing the use of inline functions:
#include <stdio.h>
// 定义一个内联函数
inline int add(int a