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What is the difference between In line Function and Preprocessed in c plus plus?
Wiki User
∙ 14y ago
An inline function is one where the compiler substitutes the body of the function for its invocation. By doing this, the compiler avoids the cost of setting up and tearing down a function call. This is most effective when dealing with small, one or two line, functions.
A preprocessor macro does the same thing, except that the main compiler never "sees" the original invocation. Again, this is most effective when dealing with small functions.
Is there a difference? Yes and no. The two methods can result in the exact same object code, but (with macros) you lose type checking and other checking of various "problems", such as side effects, that can cause your code to work in an unexpected fashion. THese side effects can be difficult to diagnose with macros, because you don't directly see what is actually being compiled. The down side of both methods is that you have duplicate code in each place. The up side is speed.
The inline attribute is a compiler "hint". The compiler can choose to ignore it. By letting the compiler choose, you can gain performance and/or code size benefits, so it is better to go with inlining - that way, the compiler can catch problems before they become difficult to solve.
Wiki User
∙ 14y ago
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