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Why Inline Functions Are Better Than Macros?

James H. Sterling • • 7 min read
Why Inline Functions Are Better Than Macros?
The major difference between inline functions and macros is the way they are handled. Inline functions are parsed by the compiler, whereas macros are expanded by the C++ preprocessor. The reason C++ has inline functions and macros is to eliminate the overhead incurred by function calls.

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Correspondingly, is macro or inline function better?

The basic difference between inline and macro is that an inline functions are parsed by the compiler whereas, the macros in a program are expanded by preprocessor. The compiler may not inline and expand all the functions defined inside a class. On the other hand, macros are always expanded.

Secondly, why macros are faster than function? Macro execution is faster than function execution because in function, much of time is used to take control from function call to called function and much of time is spent in this process. Whereas in macro expression are directly replaced in the source code.

Similarly, it is asked, what is the advantage of inline functions over macros?

Answer: Advantage: Macros and Inline functions are efficient than calling a normal function. The times spend in calling the function is saved in case of macros and inline functions as these are included directly into the code. Macro is expanded by preprocessor and inline function are expanded by compiler.

Why inline functions are faster?

Inline functions are faster because you don't need to push and pop things on/off the stack like parameters and the return address; however, it does make your binary slightly larger. Marking something inline does not give you a guarantee that it will be inline. It's just a suggestion to the compiler.

Related Question Answers

What is the purpose of macro?

A macro is an automated input sequence that imitates keystrokes or mouse actions. A macro is typically used to replace a repetitive series of keyboard and mouse actions and are common in spreadsheet and word processing applications like MS Excel and MS Word. The file extension of a macro is commonly .

What is macro explain with example?

A macro (which stands for "macroinstruction") is a programmable pattern which translates a certain sequence of input into a preset sequence of output. When the code is preprocessed before compilation, the macro will be expanded each time it occurs. For instance, using our macro like this: int num = square(5);
James H. Sterling
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James H. Sterling

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.