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Re: structures still confusing [message #49069]

Tue, 13 June 2006 09:33

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Tue, 13 Jun 2006 09:13:49 +0100, Allan Whiteford wrote:

> Martin,
>
> print,(s.m)[0]
>
> is probably less confusing.

But alas, way less efficient, since to access just that one element, it
creates an (arbitrarily large) temporary vector (s.m). I don't
specifically cover multi-dimensional struct slices, but some info on
precedence etc. can be found in:

http://www.dfanning.com/misc_tips/precedence.html

The basic hint here is that structure dereference and array dereference
are at the same level of precedence, and don't step on eachother's toes
(both left-right associative), so unless you have pointers mixed in, you
shouldn't need *any* parentheses to get to an arbitrarily deeply nested
array of structure of structure of array of ... and if you do have
pointers mixed in, you just need a *single* pair of parentheses around
each and every pointer expression (except a top level pointer). Though
they result in bizarre looking expressions, the rules are quite simple.

JD

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[Message index]

		Re: structures still confusing By: JD Smith on Tue, 13 June 2006 09:33
		Re: structures still confusing By: rother on Tue, 13 June 2006 08:45
		Re: structures still confusing By: btt on Tue, 13 June 2006 07:54
		Re: structures still confusing By: Allan Whiteford on Tue, 13 June 2006 01:13
		Re: structures still confusing By: Mark Hadfield on Mon, 12 June 2006 18:42

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