John Labenski wrote:
> On Sat, Oct 25, 2008 at 1:05 PM, klaas.holwerda <[EMAIL PROTECTED]>
> wrote:
>> Hi John,
>>
>> %operator a2dCanvasObjectListIter& operator--(int)
>>
>> If you change it to generate this, down here, it will work:
>>
>> *returns = ((*self).operator++(arg1));
>
> I don't think that post-incrementing makes much sense for Lua.
I would be very happy if you could still change it to become like the
above, since else i can't get it compiled for STL lists. Its iterator
does not accept the pre-incr only, or the other way around.
I try to explain how i do it now, and it works, if i do the needed
modification to the generated C++ wrapping, in order to fit the STL
operators, which i can not change.
First i already have a subclassed list based on STL and smart pointers.
The members lbegin and lend i had to add to satisfy lua, it does not
like function called end(). All the rest of the STL list functions and
iterator functions, i do add in lua.
class A2DCANVASDLLEXP a2dCanvasObjectList: public
a2dSmrtPtrList<a2dCanvasObject>
{
public:
a2dCanvasObjectList();
~a2dCanvasObjectList();
iterator lbegin();
iterator lend();
.... all other members ...
}
Next i make a typedef for this list its iterator in order to have a non
template iterator for wxLua. Understand that i do not subclass the
iterator, and that this would make the trick impossible. The iterator
above is a fixed subclass of the STL template list class, and i can not
modify it or use another subclass of this iterator. That is why i need
to use the operators of the base STL iterator, and i need to use them
from wxLua directly also, or at least the code generated in C++ by the
wrapper, must fit the STL iterator class directly.
typedef a2dCanvasObjectList::iterator a2dCanvasObjectListIter;
Now this is how the list is wrapped, notice the extra functions, which
are not part of a2dCanvasObjectList directly, only of the lowest STL
list base class.
%include "canvas/include/objlist.h"
%class %noclassinfo a2dCanvasObjectList, a2dSmrtPtrList
a2dCanvasObjectList()
a2dCanvasObjectListIter lbegin()
a2dCanvasObjectListIter lend()
bool empty()
size_t size()
a2dCanvasObject* front()
a2dCanvasObject* back()
void push_front( a2dCanvasObject* obj )
void pop_front()
void push_back( a2dCanvasObject* obj )
void pop_back()
%operator a2dCanvasObjectList& operator=( const a2dCanvasObjectList&
other )
// REST here
%endclass
And now the wrapping code for the iterator. In principle i just add all
function of STL list it's iterator. But first only the operator ones,
because the are the key factor to succeed.
%class %encapsulate %noclassinfo a2dCanvasObjectListIter
a2dCanvasObjectListIter()
%operator a2dCanvasObjectPtr operator*() const
%operator a2dCanvasObjectListIter& operator=(const
a2dCanvasObjectListIter& other)
%operator bool operator ==( const a2dCanvasObjectListIter& iter
) const
%operator bool operator !=( const a2dCanvasObjectListIter& iter
) const
%operator a2dCanvasObjectListIter& operator++()
%operator a2dCanvasObjectListIter& operator++( int )
%operator a2dCanvasObjectListIter& operator--()
%operator a2dCanvasObjectListIter& operator--(int)
%endclass
And at last a working wxLua script with the above.
iter3 = childs:lbegin()
iter4 = childs:lend()
if iter3:op_eq(iter4) then
cmdh:Message("list is empty"..tostring(iter3)..tostring(iter4) )
else
cmdh:Message("list has "..childs:size().." elements" )
end
nameOfobj = ""
iter3 = childs:lbegin()
for i=1,childs:size() do
obj = iter3:op_mul()
nameOfobj = nameOfobj.."\n"..obj:Get():GetName()
iter3:op_inc()
end
cmdh:Message("names are:\n"..nameOfobj)
The only thing i do not like in this script is the name op_mul() to get
a reference to the object in the list. A name like op_deref() would be
much better.
If we can get the operators to work (generate working code) for STL, in
think that it is a nice way to use STL lists in lua. And the effort is
very reasonable.
But i need you to make it happen, because i can't make bananas of
genwxbind.lua :-)
Thanks,
Klaas
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