[Tfug] Developer question

[Bexley Hall]

Greetings!

--- Robert Hunter <hunter at tfug.org> wrote:

> On 7/2/07, Bexley Hall <bexley401 at yahoo.com> wrote:
> > Extra credit:  a scheme whereby the entries in
> > colornames[] can be assured to correspond to the
> > correct enumeration ordering WITHOUT PENALIZING
> > THE TEXT SIZE!   For example:
> 
> Another possiblity is to use a struct to hold your
> symbolic constants,
> and rely on a compiler warning to let you know when
> it is missing
> initializers.  The advantage would be that you could
> use arbitrary data
> types for your constants, whereas you would be
> limited to a single data
> type per array ( when using the "table" approach ).
> 
> <snip>
> struct symbolic_constants {
>     char *red;
>     int   green;
>     float blue;
> };
> 
> /* works fine */
> static const struct symbolic_constants SC1 = {
>     "Red",
>     42,
>     3.14
> };
> 
> /* compiler warning about missing initializer */
> static const struct symbolic_constants SC2 = {
>     "Red",
>      42,
> };
> </snip>
> 
> In C99 you can use "designated" initializers for
> structs.  This is very
> nice, because now you can specify your intializers
> in any order, and be
> sure that they are being assigned to the correct
> field.
> 
> <snip>
> /* C99 style "designated initializers" */
> static const struct symbolic_constants SC1 = {
>     .blue  = 3.14,
>     .green = 42,
>     .red = "Red",
> };
> </snip>

Hmmm... I'll have to stew on this.  I'm not sure it
will work "as is" but I might be able to coerce it
to doing what I want.  I will have to see what it 
imposes on the code...
 
> Unfortuantely, gcc does not seem to emit warnings
> about missing
> initializers when using the "designated" syntax.  Ah
> well, no extra
> credit. ;-)
> 
> PS.  You are talking about C and not C++, right?

Yes.  I mix C and C++ syntax freely (even using
what *appear* to be "class methods", etc.) but
always in ways that a strictly conforming C compiler
can accommodate.

Thx,
--don


       
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