Re: [Boost-users] Inline functions in boost/utility

Ovanes Markarian escribió:

On Tue, Feb 10, 2009 at 5:59 PM, Niels Dekker - mail address until 2010-10-10 mailto:niels_address_until_2010-10-10@xs4all.nl> wrote:

Timenkov Yuri wrote:

Looking through assembly code of simple test produced by gcc with optimization, I've noticed that free functions in utility/value_init.hpp (get and set) are not declared as inline, though its body consist only of prologue and epilogue.

Is there any reason for this or just a bug?

Sorry, I don't really get it. First of all, utility/value_init.hpp doesn't have a "set". Do you mean "swap"? But secondly it's really up to the compiler whether or not those functions are inlined. An "inline" keyword would only be a hint to the compiler to do so, in this case. But as value_init.hpp provides the complete definitions of the function templates, it shouldn't be hard for the compiler to apply inlining. Are you saying that gcc would /only/ inline those functions, when they are declared as inline?

Yuri, Niels is right. This article might be of interest for you.

http://www.gotw.ca/gotw/033.htm

There are cases where you must declare a function as inline, otherwise a linker will have ambiguity of more than one identical symbols and fail to link:

Yep, but this does not apply to function templates, which can be defined in different translation units, with the only requirement that the definition coincides in each unit. See http://tinyurl.com/crkyl3 , and in particular the answer from Daveed Vandevoorde. AFAICS the get's in utility/value_init.hpp are all function templates. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo