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D - dmd alpha 3

reply "Walter" <walter digitalmars.com> writes:
ftp://www.digitalmars.com/dmdalpha3.zip

Fixed a lot of bugs regarding arrays and strings.

Check out strings.d, the D string runtime library functions. It makes much
use of array slicing and unit tests.

-Walter
Dec 19 2001
next sibling parent reply "Pavel Minayev" <evilone omen.ru> writes:
"Walter" <walter digitalmars.com> wrote in message
news:9vrg2r$2q8m$1 digitaldaemon.com...

 ftp://www.digitalmars.com/dmdalpha3.zip

 Fixed a lot of bugs regarding arrays and strings.

 Check out strings.d, the D string runtime library functions. It makes much
 use of array slicing and unit tests.


I might be mistaken... but isn't it supposed to be alpha 4
(since alpha 3 was released several days ago already)? =)
Dec 19 2001
parent "Walter" <walter digitalmars.com> writes:
"Pavel Minayev" <evilone omen.ru> wrote in message
news:9vrsog$4c1$1 digitaldaemon.com...

 "Walter" <walter digitalmars.com> wrote in message
 news:9vrg2r$2q8m$1 digitaldaemon.com...

 ftp://www.digitalmars.com/dmdalpha3.zip

 Fixed a lot of bugs regarding arrays and strings.

 Check out strings.d, the D string runtime library functions. It makes




much

 use of array slicing and unit tests.


 I might be mistaken... but isn't it supposed to be alpha 4
 (since alpha 3 was released several days ago already)? =)


Oh well <g>
Dec 20 2001
prev sibling parent reply "Pavel Minayev" <evilone omen.ru> writes:
Heh,

Seems like you've forgot to include the new phobos.lib
into the archive: it's dated 12/16 and has all the new
stuff like string functions missing.

By the way, a question about strings. Is cmp() just a
"temporary" solution, or you are going to drop support
for == and friends on strings completely?
Dec 20 2001
parent reply "Walter" <walter digitalmars.com> writes:
"Pavel Minayev" <evilone omen.ru> wrote in message
news:9vs88g$g4j$1 digitaldaemon.com...

 Seems like you've forgot to include the new phobos.lib
 into the archive: it's dated 12/16 and has all the new
 stuff like string functions missing.


Fixed. Oops.


 By the way, a question about strings. Is cmp() just a
 "temporary" solution, or you are going to drop support
 for == and friends on strings completely?


I don't think == is going to work for strings. It is more for detecting if
the string references are the same.
Dec 20 2001
parent reply "Pavel Minayev" <evilone omen.ru> writes:
"Walter" <walter digitalmars.com> wrote in message
news:9vscf4$jm6$2 digitaldaemon.com...


 "Pavel Minayev" <evilone omen.ru> wrote in message
 news:9vs88g$g4j$1 digitaldaemon.com...

 Seems like you've forgot to include the new phobos.lib
 into the archive: it's dated 12/16 and has all the new
 stuff like string functions missing.


 Fixed. Oops.


 By the way, a question about strings. Is cmp() just a
 "temporary" solution, or you are going to drop support
 for == and friends on strings completely?


 I don't think == is going to work for strings. It is more for detecting if
 the string references are the same.


Not a good idea IMHO. One thing that made me move to C++ from
C was better string handling (std::string). I'm not quite sure
I'd move from C++ to D if it doesn't have decent string
support. Why not just overload comparison operators for char[]
anyhow?
Dec 20 2001
parent reply "Walter" <walter digitalmars.com> writes:
"Pavel Minayev" <evilone omen.ru> wrote in message
news:9vsnho$tjq$1 digitaldaemon.com...

 Not a good idea IMHO. One thing that made me move to C++ from
 C was better string handling (std::string). I'm not quite sure
 I'd move from C++ to D if it doesn't have decent string
 support.
 Why not just overload comparison operators for char[]
 anyhow?


Because with == the way it is, I can determine if s[] and t[] share storage.
I have thought about using:
    s.cmp(t)
Dec 20 2001
next sibling parent reply Russell Borogove <kaleja estarcion.com> writes:
Walter wrote:

 
 "Pavel Minayev" <evilone omen.ru> wrote in message
 news:9vsnho$tjq$1 digitaldaemon.com...

 Not a good idea IMHO. One thing that made me move to C++ from
 C was better string handling (std::string). I'm not quite sure
 I'd move from C++ to D if it doesn't have decent string
 support.
 Why not just overload comparison operators for char[]
 anyhow?


 
 Because with == the way it is, I can determine if s[] and t[] share storage.
 I have thought about using:
     s.cmp(t)


I'm really with Pavel on this one.

I'd guess that it's about 10 times more likely that a programmer 
will want to know if two strings contain the same sequence of 
characters than want to know if they share storage. The operator
used for the former should be as short, intuitive, and readable 
as possible. 

How about:
   char [] s;
   char [] t;
    ... 
   if (s == t)         { ... }   // value equivalence
   if (&s[0] == &t[0]) { ... }   // ref equivalence: literally, 
                                 // are the addresses of the first 
                                 // chars the same?

I'd like to see this apply to any array type, not just strings. 

Alternately, since we have the principle of array operations, with
[] referring to the whole array, I could accept:

   if (s == t)     { ... }   // reference equivalence
   if (s[] == t[]) { ... }   // value equivalence

...but that seems dangerously error-prone.

-RB
Dec 20 2001
parent "Pavel Minayev" <evilone omen.ru> writes:
"Russell Borogove" <kaleja estarcion.com> wrote in message
news:3C22286D.A3FCB77C estarcion.com...


 I'd guess that it's about 10 times more likely that a programmer
 will want to know if two strings contain the same sequence of
 characters than want to know if they share storage. The operator
 used for the former should be as short, intuitive, and readable
 as possible.


Yes, yes!


 How about:
    char [] s;
    char [] t;
     ...
    if (s == t)         { ... }   // value equivalence
    if (&s[0] == &t[0]) { ... }   // ref equivalence: literally,
                                  // are the addresses of the first
                                  // chars the same?


An interesting idea.


 I'd like to see this apply to any array type, not just strings.


I don't think it is a good idea to apply it to all arrays, since
D states them as "pointers which know size of memory block they
point to".


 Alternately, since we have the principle of array operations, with
 [] referring to the whole array, I could accept:

    if (s == t)     { ... }   // reference equivalence
    if (s[] == t[]) { ... }   // value equivalence

 ...but that seems dangerously error-prone.


I've thought of it as well. AFAIK, D states that for two array
slices to be used as operands of one operator, they must be
the same size. I don't understand why this should apply to ==
and other comparison operators - they could just return false
if array sizes are different. This way, we'd had full support
for string comparisons as well.

On other hand, as you've noticed, it's quite easy to make a
mistake, forgetting to put [] at the end...
Dec 20 2001
prev sibling parent "Pavel Minayev" <evilone omen.ru> writes:
"Walter" <walter digitalmars.com> wrote in message
news:9vt62e$1em4$1 digitaldaemon.com...


 Why not just overload comparison operators for char[]
 anyhow?


 Because with == the way it is, I can determine if s[] and t[] share


storage.

If you really need this (and I doubt that it's a frequent operation),
you can always cast pointers:

    char[] s, t;
    if (s == t) ...    // check if strings are equal
    if (cast(void*)s == cast(void*)t)    // check if they share storage
Dec 20 2001