Re: Warning: The structure contains misaligned fields

jamesgiles@xxxxxxx wrote:
On Apr 28, 11:35 am, Craig Powers <eni...@xxxxxxxxxx> wrote:

The significance of SEQUENCE is that identically-declared types will be
treated as identical (i.e. if you were to repeat your declaration of
type(ccc) in a subroutine, it would be identical to the type(ccc)
declared in the module and one could be used as an actual argument
corresponding to the other as a dummy argument). The name implies that
the memory layout will be exactly as declared, but the standard does not
actually impose such a requirement.

It doesn't usually say anything about memory layout as such. However,
since SEQUENCE derived types may be used in COMMON and the components
be storage associated through that COMMON with non-derived-type
variables, it's hard to imagine how it would be implemented without
actually being in the order declared.

I thought that padding was allowed, though. COMMON in Fortran 66
was usually believed not to allow padding, creating alignment
problems fairly often. C struct definitely allows padding, which
is good because many current processors don't allow misaligned
access. (IA32 does, but it is often much slower.)
Doesn't COMMON now allow for padding?

If SEQUENCE types work with C interoperability they better
use the same padding that is used by the appropriate C compiler.

-- glen

.

Relevant Pages

 height after displaying (rendering)
... I declared is with height="100" but I see that sometimes it is larger than my declaration. ... Is it possible to get the height after rendering in JavaScript? ... If padding on the TD is 0, the clientHeight property will give the height of the content area. ...
(comp.lang.javascript)
  • Re: positioning & padding in DIV elements ...
    ... workaround/solution is to remove the width declaration from ... box padding totally disapper; I then added the padding to the outer box ... intro and bkg pages), but on the other site pages, the header graphic is now ...
    (alt.html)
  • Re: Common programming mistakes?
    ... I think of some kind of list that states the most common ... programming errors together with their frequency and the cost to find ... a declaration hides another declaration ... uninitialized memory (eg: using malloc and forgetting to use memset or such ...
    (comp.lang.misc)
    		•