When to use inline functions in C/C++ and when not to use it?

In C, there is a very good feature called inline functions. This function is similar to a C or C macro. To use inline functions, we must specify the inline keyword. We can use this type of function anywhere, but we should follow some guidelines.

When can I use inline functions?

• Inline functions can be used in the position of macros (#define)

• For small functions, we can use inline functions. It creates faster code and smaller executable files.

• We can use inline functions when the function is small and called frequently.

When should you avoid using inline functions?

• We should not use I/O bound functions as inline functions.

• When a large amount of code is used in a function, we should avoid using inline functions.

• Inline functions may not work properly when using recursion.

One thing we must remember is that inlining is not a command, but a request. So we ask the compiler to use inline functions. If the compiler decides that the current function should not be an inline function, it can convert it to a normal function.

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