Ah, ok that makes sense to me. Although for other languages reason 1 is usually decided by the compiler, but then again most of the modern languages don't interface directly with C.
-- Paulo "Jonathan M Davis" <jmdavisp...@gmx.com> wrote in message news:mailman.641.1287221213.858.digitalmar...@puremagic.com... > On Saturday 16 October 2010 01:40:55 Paulo Pinto wrote: >> Hi, >> >> while reading TDPL I start wondering what is the background between >> function and delegate. >> >> They seem to provide more or less the same funcionality, except delegate >> allows the capture >> of the function declaration environment. >> >> Most of the programming languages with support for closures only have one >> way of doing it. >> >> Why is D providing two ways of doing it? For me sounds like a feature >> similar to register, or >> inline for doing what should be the compilers work. Deciding the best >> implementation for the >> closure. >> >> Thanks, >> Paulo > > I believe that the two main reasons are > > 1. function pointers have less overhead. > > 2. If you want to use function pointers when calling C functions, you need > function pointers rather than delegates. > > but there are probably others. > > - Jonathan M Davis
