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Re: Event handler in c++

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在 2012年2月15日星期三UTC+8上午2时17分43秒，Ian Collins写道：
> On 02/14/12 11:14 PM, 88888 Dihedral wrote:
> > 在 2012年2月13日星期一UTC+8下午7时52分44秒，Robin Tucker写道：
> >> I'm using a templated method to describe, dispatch and handle events
> >> in an intuitive manner. For example, describing an event can be done
> >> with something like this:
> >>
> >>      Event<void(std::shared_ptr<Observable>, double, double, double)>
> >> MyEvent;
> >>
> >> , for an event that takes 4 parameters (the "sender" and three
> >> doubles). The handler looks like this:
> >>
> >>      void OnEventHandler(std::shared_ptr<Observable>  sender, double x,
> >> double y, double z)
> >>      {
> >>          // Handle the event.
> >>      }
> >>
> >> And the event is dispatched in the following intuitive way:
> >>
> >>      MyEvent(shared_from_this(), 3, 2, 1);
> >>
> >> It's type-safe and you can dispatch any number of parameters (up to 9
> >> actually, in the absence of variadic templates in VS2010!). Anyway the
> >> code and blog about it can be found here:
> >>
> >>      http://drrobsjournal.blogspot.com/
> >>
> >> I hope this is useful to someone.
> >
> > C++ is not very good to be usd as a language to
> > write device drives to be called by the OS.
> 
> Yes it is, you just have to provide the OS hooks as extern "C" functions.
> 
> > People working on the linux kernal talked about this
> > problem for so long.
> 
> They are somewhat bigoted.
> 
> > Unless functions in the C++ container and template libraries are incorporated into the OS kernal library
> > or system shared  linked libraries,  otherwise  C++ compiled  programs are too fat in the heap, too.
> 
> "too fat in the heap" ?
> 
> In kernel space you have two choices:
> 
> 1) Use C++ as a better C and avoid the parts that require runtime support.
> 
> 2) Use a statically linked run time library.
> 
> I use one where resources are tight and 2 where they are not.
> 
> -- 
> Ian Collins



在 2012年2月15日星期三UTC+8上午2时17分43秒，Ian Collins写道：
> On 02/14/12 11:14 PM, 88888 Dihedral wrote:
> > 在 2012年2月13日星期一UTC+8下午7时52分44秒，Robin Tucker写道：
> >> I'm using a templated method to describe, dispatch and handle events
> >> in an intuitive manner. For example, describing an event can be done
> >> with something like this:
> >>
> >>      Event<void(std::shared_ptr<Observable>, double, double, double)>
> >> MyEvent;
> >>
> >> , for an event that takes 4 parameters (the "sender" and three
> >> doubles). The handler looks like this:
> >>
> >>      void OnEventHandler(std::shared_ptr<Observable>  sender, double x,
> >> double y, double z)
> >>      {
> >>          // Handle the event.
> >>      }
> >>
> >> And the event is dispatched in the following intuitive way:
> >>
> >>      MyEvent(shared_from_this(), 3, 2, 1);
> >>
> >> It's type-safe and you can dispatch any number of parameters (up to 9
> >> actually, in the absence of variadic templates in VS2010!). Anyway the
> >> code and blog about it can be found here:
> >>
> >>      http://drrobsjournal.blogspot.com/
> >>
> >> I hope this is useful to someone.
> >
> > C++ is not very good to be usd as a language to
> > write device drives to be called by the OS.
> 
> Yes it is, you just have to provide the OS hooks as extern "C" functions.
> 
> > People working on the linux kernal talked about this
> > problem for so long.
> 
> They are somewhat bigoted.
> 

In the kernal space, the hardware supports and assembler
supports are required. 

> > Unless functions in the C++ container and template libraries are incorporated into the OS kernal library
> > or system shared  linked libraries,  otherwise  C++ compiled  programs are too fat in the heap, too.
> 
> "too fat in the heap" ?
> 
For example, the hash or map library in C++
are unreasably large and some are just faking
to be a hash table not of O(1) when there is  no hash collision at all.

A hash  can be frozen at the compile time 
is not well-distinguished from a map that can 
be modified in the run time very often.
 
This took so long for C++ to implement 
a true hash table.

> In kernel space you have two choices:
> 
> 1) Use C++ as a better C and avoid the parts that require runtime support.
> 
> 2) Use a statically linked run time library.
> 
> I use one where resources are tight and 2 where they are not.
> 
> -- 
> Ian Collins

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Thread

Event handler in c++ pratik lala <pratik3558@gmail.com> - 2012-01-22 06:42 -0800
  Re: Event handler in c++ "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-01-22 16:11 +0100
    Re: Event handler in c++ "osmium" <r124c4u102@comcast.net> - 2012-01-22 10:56 -0600
      Re: Event handler in c++ Robert Wessel <robertwessel2@yahoo.com> - 2012-01-22 21:32 -0600
      Re: Event handler in c++ Christopher <cpisz@austin.rr.com> - 2012-01-24 08:25 -0800
        Re: Event handler in c++ Robin Tucker <robinmjtucker@gmail.com> - 2012-02-13 03:52 -0800
          Re: Event handler in c++ 88888 Dihedral <dihedral88888@googlemail.com> - 2012-02-14 02:14 -0800
            Re: Event handler in c++ Ian Collins <ian-news@hotmail.com> - 2012-02-15 07:17 +1300
              Re: Event handler in c++ 88888 Dihedral <dihedral88888@googlemail.com> - 2012-02-14 11:51 -0800
                Re: Event handler in c++ Ian Collins <ian-news@hotmail.com> - 2012-02-15 16:59 +1300
                Re: Event handler in c++ MiB <michael.boehnisch@gmail.com> - 2012-02-15 02:11 -0800
                Re: Event handler in c++ Ian Collins <ian-news@hotmail.com> - 2012-02-16 07:46 +1300
                Re: Event handler in c++ Robert Wessel <robertwessel2@yahoo.com> - 2012-02-15 15:32 -0600
                Re: Event handler in c++ MiB <michael.boehnisch@gmail.com> - 2012-02-16 17:56 -0800
          Re: Event handler in c++ Rui Maciel <rui.maciel@gmail.com> - 2012-02-15 23:11 +0000
    Re: Event handler in c++ pratik lala <pratik3558@gmail.com> - 2012-01-22 16:14 -0800
      Re: Event handler in c++ "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-01-23 03:54 +0100

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