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digitalmars.D - Reserved words in D and C

reply Arcane Jill <Arcane_member pathlink.com> writes:
Please read this post with a sense of humor. This isn't a serious problem, so
I'm just posting it for fun.








Just because something is a reserved word in D, doesn't necessarily make it a
reserved word in C. How may I call this C function, whose name happens to be
inout?

Jill
Jul 20 2004
next sibling parent Stewart Gordon <smjg_1998 yahoo.com> writes:
Arcane Jill wrote:

 Please read this post with a sense of humor. This isn't a serious problem, so
 I'm just posting it for fun.
 






 
 Just because something is a reserved word in D, doesn't necessarily make it a
 reserved word in C. How may I call this C function, whose name happens to be
 inout?


Either rename the C function (if it's within your control), or write a C 
wrapper to effectively rename it.

This reminds me of an idea I've had for a while: something like

	extern("_inout") int inOut(int x);

The idea is that the actual mangled name would be specified in 
extern(...), and it would be mapped to a function name of the 
programmer's in the D code.

This could be used to interface a wider range of foreign codes, e.g. the 
Sun F90 compiler puts dots in mangled function names, preventing them 
from being interfaced for the time being.

Calling convention for this syntax?  Well, I guess plain C would be 
sensible - I'm not sure if it's accurate to say that C is the simplest, 
and that other CCs can be expressed in terms of it.

Stewart.

-- 
My e-mail is valid but not my primary mailbox, aside from its being the 
unfortunate victim of intensive mail-bombing at the moment.  Please keep 
replies on the 'group where everyone may benefit.
Jul 20 2004
prev sibling next sibling parent reply Regan Heath <regan netwin.co.nz> writes:
On Tue, 20 Jul 2004 09:31:46 +0000 (UTC), Arcane Jill 
<Arcane_member pathlink.com> wrote:

 Please read this post with a sense of humor. This isn't a serious 
 problem, so
 I'm just posting it for fun.








 Just because something is a reserved word in D, doesn't necessarily make 
 it a
 reserved word in C. How may I call this C function, whose name happens 
 to be
 inout?


I came across this when looking to convert the openssl C structures to D.

struct {
   int version;
   .. etc ..
}

'version' is a D keyword.

What can be done in this case? Perhaps inside an extern (C) block certain 
keywords aren't necessary and could be disabled/ignored? I'm not sure 
'version' is one of them however.

Regan.

-- 
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
Jul 20 2004
parent reply Charlie <Charlie_member pathlink.com> writes:
You can rename it 'versionInt' or something, its name doesnt matter, however its
offset in the struct does :),i.e.

struct  f{ int x; int y; }

is not the same as 

struct f{ int y; int x; } 

Their positions will be swapped, im thinking its found by offset alone ?.


Charlie




In article <opsbgjeunl5a2sq9 digitalmars.com>, Regan Heath says...

On Tue, 20 Jul 2004 09:31:46 +0000 (UTC), Arcane Jill 
<Arcane_member pathlink.com> wrote:

 Please read this post with a sense of humor. This isn't a serious 
 problem, so
 I'm just posting it for fun.








 Just because something is a reserved word in D, doesn't necessarily make 
 it a
 reserved word in C. How may I call this C function, whose name happens 
 to be
 inout?


I came across this when looking to convert the openssl C structures to D.

struct {
   int version;
   .. etc ..
}

'version' is a D keyword.

What can be done in this case? Perhaps inside an extern (C) block certain 
keywords aren't necessary and could be disabled/ignored? I'm not sure 
'version' is one of them however.

Regan.

-- 
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
Jul 20 2004
parent Mike Parker <aldacron71 yahoo.com> writes:
Charlie wrote:


 You can rename it 'versionInt' or something, its name doesnt matter, however
its
 offset in the struct does :),i.e.
 
 struct  f{ int x; int y; }
 
 is not the same as 
 
 struct f{ int y; int x; } 
 
 Their positions will be swapped, im thinking its found by offset alone ?.
 


They aren't the same within D, nor are they the same within C, but they 
  *are* the same when you compare the D definition to the C definition. 
D sees an int followed by an int, C sees an int followed by an int.

So in D:

struct f{int x, int y};

f ff;

ff.x = 10;
ff.y = 11;

someCFunction(&ff);

When ff is passed to the C function, the first value will still be 10 
and the second value will still be 11 although the names are reversed. 
The name only refers to the memory offset, not the value. So ff.x in D 
is the same offset as ff.y in C.
Jul 21 2004
prev sibling next sibling parent J C Calvarese <jcc7 cox.net> writes:
Arcane Jill wrote:

 Please read this post with a sense of humor. This isn't a serious problem, so
 I'm just posting it for fun.


:)


 






 
 Just because something is a reserved word in D, doesn't necessarily make it a
 reserved word in C. How may I call this C function, whose name happens to be
 inout?
 
 Jill


Assuming a person didn't have access to the C source (which would take 
away all of the fun), I wonder if you could create a .def file to work 
around this. Maybe something like this?

mydll.def
---------
LIBRARY mydll
EXETYPE NT
SUBSYSTEM WINDOWS
EXPORTS
_InOut 4 = inout



Then use D code like this:

    extern(C) int InOut(int x);

    void main()
    {
        printf("%d\n", InOut(-1));
    }


I think it would work, but I haven't tested it.

-- 
Justin (a/k/a jcc7)
http://jcc_7.tripod.com/d/
Jul 20 2004
prev sibling next sibling parent teqDruid <me teqdruid.com> writes:
It'd be nice if a simple alias could be used to fix this, but somehow I
doubt dmd's parser would make this easy to do.

On Tue, 20 Jul 2004 09:31:46 +0000, Arcane Jill wrote:


 Please read this post with a sense of humor. This isn't a serious problem,
 so I'm just posting it for fun.
 






 
 Just because something is a reserved word in D, doesn't necessarily make
 it a reserved word in C. How may I call this C function, whose name
 happens to be inout?
 
 Jill
Jul 20 2004
prev sibling parent "Carlos Santander B." <carlos8294 msn.com> writes:
"Arcane Jill" <Arcane_member pathlink.com> escribió en el mensaje
news:cdioq2$1aid$1 digitaldaemon.com
| Please read this post with a sense of humor. This isn't a serious problem,
so
| I'm just posting it for fun.
|






|
| Just because something is a reserved word in D, doesn't necessarily make
it a
| reserved word in C. How may I call this C function, whose name happens to
be
| inout?
|
| Jill

My 2 cents:
I would write a C wrapper around it and use the wrapper in D.

/* wrapper.c */
int inout(int x);
int InOut(int x) { return inout(x); }

// AJ_module.d
extern (C) int InOut(int x);

void main ()
{
    printf("%d\n", InOut(-1));
}

-----------------------
Carlos Santander Bernal
Jul 21 2004