[gameprogrammer] Re: Any C++ macro champions out there?
- From: Alan Wolfe <alan.wolfe@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Thu, 3 Jan 2013 17:33:26 -0800
Normally that would work great Stephane, but if you look at my macro list,
it's a list of lists.
I agree, if it was a single list i could do multiple passes and do:
// 1 - define class header and member vars and getters / setters
// 2 - define constructor parameters
// 3 - define constructor body and then end class declaration
But the problem is that i have multiple classes represented in my list,
which means i can only do a single pass since i can't do the header for
each class, then the constructor header for each class, and then end each
class.
In the below, 3 classes need to be generated from the single macro list:
#define TRIGGEREVENTLIST \
\
TRIGGEREVENT_BEGIN(PokeEvent, Base) \
TRIGGEREVENT_ITEM(int, PokeCount, true, 0) \
TRIGGEREVENT_ITEM(bool, PokeHard, false, false) \
TRIGGEREVENT_END() \
\
TRIGGEREVENT_BEGIN(AnotherEvent, Base) \
TRIGGEREVENT_ITEM(float, Something, true, 0.5f) \
TRIGGEREVENT_END() \
\
TRIGGEREVENT_BEGIN(UberPokeEvent, PokeEvent) \
TRIGGEREVENT_ITEM(float, UberPokeMultiplier, true, 2.0f) \
TRIGGEREVENT_END()
On Thu, Jan 3, 2013 at 5:26 PM, Stéphane Marchesin <
stephane.marchesin@xxxxxxxxx> wrote:
> On Wed, Jan 2, 2013 at 10:29 PM, Alan Wolfe <alan.wolfe@xxxxxxxxx> wrote:
> > Any C++ macro champions out there? I'm Trying to figure out how to do
> > something and hoping i don't have to fall back on code generation or
> manual
> > maintenance :P
> >
> > I have a macro list defined like this:
> >
> > #define TRIGGEREVENTLIST \
> > \
> > TRIGGEREVENT_BEGIN(PokeEvent, Base) \
> > TRIGGEREVENT_ITEM(int, PokeCount, true, 0) \
> > TRIGGEREVENT_ITEM(bool, PokeHard, false, false) \
> > TRIGGEREVENT_END() \
> > \
> > TRIGGEREVENT_BEGIN(AnotherEvent, Base) \
> > TRIGGEREVENT_ITEM(float, Something, true, 0.5f) \
> > TRIGGEREVENT_END() \
> > \
> > TRIGGEREVENT_BEGIN(UberPokeEvent, Base) \
> > TRIGGEREVENT_ITEM(float, UberPokeMultiplier, true, 2.0f) \
> > TRIGGEREVENT_END()
> >
> > And I want to create a class per trigger event that contains each item
> as a
> > member and also a const & getter and setter for each item within it. I
> have
> > that part working, but I'm stuck on the next part...
> >
> > What i need to do next is make a constructor or some kind of construction
> > mechanism which contains all the items as parameters to the function, and
> > then sets the members to the passed in values.
> >
> > The problem I'm hitting is that to do that, I essentially need to loop
> > through an events item list twice (once for params, once for setting the
> > members to the param values) before moving onto the next event, but not
> sure
> > how to do that (or even if there is a way).
>
> You put all your things in one header, let's call that header
> listofthings.h:
>
> DO_SOMETHING(0, "A")
> DO_SOMETHING(2, "B")
> ...
>
> then you can include that header multiple times, redefining
> DO_SOMETHING differently every time:
>
> #define DO_SOMETHING(A,B) printf("%d %s\n", A, B);
> #include "listofthings.h"
> #undef DO_SOMETHING
>
> #define DO_SOMETHING(A,B) table[A] = B;
> #include "listofthings.h"
> #undef DO_SOMETHING
>
> Stéphane
>
> >
> > Unfortunately, a potential added nail to the coffin is that the
> constructor
> > (or construction mechanism) also needs to include as parameters all of
> the
> > inherited items.
> >
> > I really want compile time assurance that when these are constructed,
> that
> > they have all the necessary data supplied to them (so when you add or
> remove
> > items, you get compile time errors about the places in the code you need
> to
> > update).
> >
> > Thanks for any insight anyone can provide!
> >
> > PS if anyone is interested, I can share the code i have right now to
> > generate classes with private members and getters and setters, as well
> as a
> > COMPILE TIME calculation of the size of the largest class (so you could
> use
> > it as a parameter to an object pool allocator or something).
>
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