On Thursday, 19 April 2012 at 11:46:59 UTC, Steven Schveighoffer
wrote:
On Wed, 18 Apr 2012 17:07:07 -0400, Xan <xancor...@gmail.com>
wrote:
Hi,
I want to know what is most interesting for me: delegates or
functions. I consulted sources but none say the practical
consequences of such election.
What can I do and what can't I do with functions and delegates?
Please, be didactics, I'm a newbee
In my experience, delegates are the more useful type to
*store*. I've implemented this in some places:
int delegate(int) stored_dg;
void setDelegate(int delegate(int) dg) { stored_dg = dg; }
void setDelegate(int function(int) fn) { stored_dg =
std.functional.toDelegate(fn); }
On the whole, delegates are slightly more expensive to call,
but not by much. However, a function converted to a delegate
pays the penalty of a double call, because it takes a call to
strip out the context pointer. I wish there was a more
straightforward way to do this...
But I've not seen this be a huge factor -- yet.
-Steve
Thank you very much all of you for the information. Now I have an
idea of practical benefits and contra-benefits of these.
By the other hand, is there toFunction for passing delegate to
function (theorically it's possible, isn't?)
Thanks,
Xan.
