If a function contains a loop like for, while, do-while loop.We cannot provide the inlining to the functions in the following circumstances: When the function is encountered inside the main() method, it is expanded with its definition thus saving time. In the case of function calling, the time for calling such small functions is huge, so to overcome such a problem, a new concept was introduced known as an inline function. The preprocessor macros are widely used in C, but the major drawback with the macros is that these are not normal functions which means the error checking process will not be done during the compilation.Ĭ++ has provided one solution to this problem. The solution to this problem is to use macro definitions known as macros. If the length of the function is small, then the substantial amount of execution time is spent in such overheads, and sometimes time taken required for moving to the calling function will be greater than the time taken required to execute that function. Whenever the function is called, then it takes a lot of time to execute the tasks, such as moving to the calling function. The main use of the inline function in C++ is to save memory space. Why do we need an inline function in C++?
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