From: Yuri Khan <yuri.v.khan@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
Subject: Re: Check for redundancy
Date: Fri, 3 Jul 2015 17:48:28 +0600 [thread overview]
Message-ID: <CAP_d_8UG1utU7Uh7R8JdVqfTasddGEu6KfvCDi7xXmT3Bjgqig@mail.gmail.com> (raw)
In-Reply-To: <83y4ixzqsd.fsf@gnu.org>
On Fri, Jul 3, 2015 at 12:41 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>> Nowadays (since ≈2002?) the SDK defines a strict mode, where different
>> kinds of handles become pointers to different tag structure types:
>>
>> struct tagWND; // declared but not defined
>> typedef struct tagWND* HWND;
>
> Perhaps in MSVC compiler, not in MinGW. With MinGW, something similar
> happens only if you compile with -DSTRICT (which is rarely, if ever,
> done). And even in MSVC headers I see something significantly
> different from what you show above, and it's also conditioned by
> STRICT being defined.
Yes. -DSTRICT has been the default setting for new projects created in
MSVC++ since version 7 or so. Is there some problem enabling STRICT on
MinGW, or a reason why it is done rarely?
How is it significantly different? Here’s what I see in some ancient copy:
// in winnt.h
#ifdef STRICT
typedef void *HANDLE;
#define DECLARE_HANDLE(name) struct name##__ { int unused; }; typedef
struct name##__ *name
#else
typedef PVOID HANDLE;
#define DECLARE_HANDLE(name) typedef HANDLE name
#endif
// in windef.h
DECLARE_HANDLE (HWND);
DECLARE_HANDLE (HHOOK);
OK, it’s not an undefined struct, it’s a struct with a unique type
name and a single unused int field. This does not affect the type
system, as neither C nor C++ have structural typing. Leaving the
struct undefined would probably be a bit safer.
next prev parent reply other threads:[~2015-07-03 11:48 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-24 9:29 Check for redundancy Andreas Röhler
2015-06-24 13:23 ` Drew Adams
2015-06-24 14:55 ` Andreas Röhler
[not found] ` <mailman.5580.1435157733.904.help-gnu-emacs@gnu.org>
2015-06-24 18:21 ` Stefan Monnier
2015-06-24 21:10 ` tomas
2015-06-25 3:23 ` Stefan Monnier
2015-06-25 7:47 ` tomas
2015-06-26 15:01 ` Emanuel Berg
2015-06-26 20:25 ` Marcin Borkowski
2015-06-26 22:48 ` Emanuel Berg
2015-06-27 12:11 ` Robert Thorpe
2015-06-27 13:12 ` tomas
2015-06-27 23:02 ` Emanuel Berg
2015-06-28 11:07 ` tomas
2015-06-28 15:50 ` Emanuel Berg
2015-06-28 16:35 ` Yuri Khan
2015-06-28 20:03 ` Emanuel Berg
2015-06-28 21:38 ` Robert Thorpe
2015-06-28 23:47 ` Emanuel Berg
2015-07-02 23:37 ` Robert Thorpe
2015-07-03 3:36 ` Yuri Khan
2015-07-03 6:41 ` Eli Zaretskii
2015-07-03 11:48 ` Yuri Khan [this message]
2015-07-03 12:16 ` Eli Zaretskii
2015-07-03 22:59 ` Robert Thorpe
2015-07-03 6:09 ` tomas
2015-07-03 19:56 ` Emanuel Berg
[not found] ` <mailman.6215.1435903802.904.help-gnu-emacs@gnu.org>
2015-07-03 6:38 ` Rusi
2015-07-03 7:54 ` tomas
2015-07-03 8:55 ` Loris Bennett
2015-06-24 23:31 ` Emanuel Berg
2015-06-25 2:03 ` Óscar Fuentes
2015-06-25 2:07 ` Emanuel Berg
2015-06-25 2:53 ` Óscar Fuentes
2015-06-25 3:21 ` Emanuel Berg
[not found] ` <mailman.5603.1435188769.904.help-gnu-emacs@gnu.org>
2015-06-25 7:43 ` Stefan Nobis
2015-06-25 8:52 ` Andreas Röhler
2015-06-26 14:51 ` Emanuel Berg
2015-06-26 14:39 ` Emanuel Berg
[not found] ` <mailman.5719.1435329683.904.help-gnu-emacs@gnu.org>
2015-06-27 7:40 ` Stefan Nobis
2015-06-28 2:02 ` Emanuel Berg
2015-06-28 2:40 ` Emanuel Berg
[not found] <mailman.6209.1435880273.904.help-gnu-emacs@gnu.org>
2015-07-03 8:40 ` Pascal J. Bourguignon
2015-07-03 20:04 ` Emanuel Berg
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