How to use inline in c language

The inline keyword is used to declare a C language function as an inline function. By directly inserting the function code into the calling point, the function call overhead is eliminated, thereby improving execution efficiency. However, it should be noted that inline functions may lead to code bloat and difficulty in debugging, so they are suitable for scenarios where the function body is small, frequently called, and expensive.

Usage of inline in C language

The inline keyword is used in C language to declare a function as Inline functions. Inline functions are inserted directly into the function call at compile time, rather than having the compiler generate function call instructions.

Function:

The main function of inline functions is to improve code execution efficiency. By avoiding the overhead of function calls, inline functions can bring significant performance improvements in some cases.

Usage:

To declare a function as an inline function, you can add the inline keyword before the function declaration, for example:

<code class="c">inline int sum(int a, int b) {
    return a + b;
}</code>

Advantages:

• Improve execution efficiency
• Eliminate function call overhead
• Improve code readability and maintainability

Disadvantages:

• Code bloat: Inline functions will be copied to each call, causing the code file to become larger.
• Debugging Difficulty: Because inline functions are embedded at the call site, the debugger may have difficulty setting breakpoints and tracing code execution.

Applicable scenarios:

Inline functions are usually suitable for the following scenarios:

• The function body is small and the amount of calculation is large Light
• The function is called frequently
• The overhead of the function is much greater than its execution time

Note:

• Whether an inline function will be inlined depends on the compiler's optimization settings.
• For large or complex functions, using inline functions may be counterproductive.

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