C++/ D C struct2 D inner classes, C++ templates/D templates

[BLS]

Bill Baxter schrieb:
> BLS wrote:
>> Hi Chris,
>> MANY THANKS.
>> Your help is kicking me into the right direction.
>>
> 
>> In case that you have time enough:  Here the /templated/ B+Tree Cpp 
>> implementation. 
>> http://idlebox.net/2007/stx-btree/stx-btree-0.8/include/stx/btree.h.html
>>
>> Read it ? Do you see something not doable in D ?
>> again, thanks for beeing so gentle and patient
>> Bjoern
> 
> 
> The tricky thing, as with all STL-type C++, is translating the 
> iterators.  The STL standard technique for iterators is to overload 
> operator* and operator->, which you can't do in D.  So you need to use 
> methods or something for those instead.  Something like iter.value or 
> iter.deref or iter.data, etc.  Also there's a lot of passing of 
> references here and there in STL code like that.  That's always kinda 
> tricky to figure out what to do with.  Are you doing this with D2 or D 
> classic?


D classic because TANGO.


> 
> One issue I ran into trying to translate std::map was the use of the 
> idiom   T(val) or T x(val)  to construct objects.  In C++ that works 
> fine whether T is an 'int', a class, or a struct.  But in D (AFAIK) 
> there's no single expression that can be used to construct either a 
> plain value type or a class type with the given initializer.  I didn't 
> really think about it too hard though.  I decided it was easier to grab 
> ArcLib's RedBlackTree implementation and use that.
> 
> --bb

Hi Bill, thanks for taking the time to answere.
first - OFF Topic
interesting that you name ArcLibs RB Tree. My Interest in B+Trees are, 
beside learning,  piece tables ... a (unknown?) data-structure which 
uses trees to hold text information often used in 
Text-processors/Management-Tools. /The workhorse in ABIWORD/. The funny 
part is that people behind ABI WORD  are switching from RB Trees to 
guess what : B+Trees, because of speed.  Further ArcLib has builtin 
support for FreeType .... So I wonder why not build something better 
than Scintilla using ArcLib ? [my never ending IDE proj.]

Some piece table info :

Both *NOT that good* :
http://www.cs.unm.edu/~crowley/papers/sds/node15.html#SECTION00064000000000000000
http://e98cuenc.free.fr/wordprocessor/piecetable.html


next :
perheps it is not nessesary to use std::map; 2 weeks ago I read in 
Dr.Dobs about Lisp like lists in C.
Hmmm difficult to say "Okay thats it" : because it is more a feeling but 
LISP Lists (implemented in C)  do not use _classic_ nodes just void* 
probabely this is a workaround. As said, more a feeling;

And prob. using D AAs as key/value pairs (thanks to Chris) like :
class X(_Key, _Val)
{
bla, bla

	_Key[_Val[]] key_val_pair;

is a workaround??? It is late now, I am afraid I produce too much 
bullshi* Next try tommorow

Bjoern