C struct construct question

[John Vetterli]

On Tue, 18 Apr 2006, Peter wrote:
> I found an unusual C construct in Asterisk source code and I am looking for 
> an explanation. Of course I cannot find one online. Here is a quote:
> static const struct ast_channel_tech local_tech = {
>        .type = type,
>        .description = tdesc,
>        .capabilities = -1,
>        .requester = local_request,
>        .send_digit = local_digit,
> 	.call = local_call,
>        .hangup = local_hangup,
>        .answer = local_answer,
>        .read = local_read,
>        .write = local_write,
>        .exception = local_read,
>        .indicate = local_indicate,
>        .fixup = local_fixup,
>        .send_html = local_sendhtml, };
> how does this work ? References ?

This syntax specifies which field in struct ast_channel_tech receives 
which value, as opposed to having to list the the values in the same order 
as they were declared in. Have a look at:

   http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Designated-Inits.html

That web page is for gcc version 4.1.0, but that feature seems to have 
been in gcc since the first 3.x release.

HTH
JV
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