Force inline functions in C++

[Pikkolamakkia]

Hi, is possible force the inline functions when I compile a source with gcc?

Ps. Sorry for my bad English.... I'm not English

[neonek]

Maybe -finline-functions ?

[overburn]

erm sorry for the possible noob question , but can't you just declare them "inline" and that's it?

[Pikkolamakkia]

So the compiler decides if he want expand them or use them as functions.... I want force the expanding

[Martijn]

You can force it with a gcc attribute:
static void inline __attribute__((always_inline)) yourFunction() ...

[Pikkolamakkia]

I must declare it as static?

[Troy Martin]

Well, no, static just tells the compiler/linker that that function can only be used in the file that it is defined and written in.

[JohnnyTheDon]

Its a good idea to prevent clashes if you're puting the function inside of a header file. Otherwise each object file could export this function, leading to multiple definition errors when you link.

[Solar]

In some cases, forcing the inlining isn't a good idea, so make sure you are aware of the implications, e.g. when using virtual functions. (Read Scott Meyers' "Effective C++"?)

[Pikkolamakkia]

In some cases, forcing the inlining isn't a good idea, so make sure you are aware of the implications, e.g. when using virtual functions.

Yes but if I had to write a for cycle, I'd prefare write it as inline function that a real function (isn't faster???)

[Solar]

Simply declare the function 'inline' (and define it in the header file) and let the compiler decide whether to actually inline it or not. That's why 'inline' is merely a suggestion: The compiler knows more about the generated code than you do. (Usually.)

"Forcing" something is almost never a good idea.