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From: Markus Armbruster <armbru@redhat.com>
To: Eduardo Habkost <ehabkost@redhat.com>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Daniel P. Berrangé" <berrange@redhat.com>,
	"Marc-André Lureau" <marcandre.lureau@gmail.com>,
	"Markus Armbruster" <armbru@redhat.com>,
	QEMU <qemu-devel@nongnu.org>
Subject: Re: [PATCH v2 3/8] qnum: QNumValue type for QNum value literals
Date: Mon, 23 Nov 2020 08:51:27 +0100	[thread overview]
Message-ID: <877dqcwlxc.fsf@dusky.pond.sub.org> (raw)
In-Reply-To: <20201120182720.GF2271382@habkost.net> (Eduardo Habkost's message of "Fri, 20 Nov 2020 13:27:20 -0500")

Eduardo Habkost <ehabkost@redhat.com> writes:

> On Fri, Nov 20, 2020 at 06:29:16AM +0100, Markus Armbruster wrote:
[...]
>> When the structure of a data type is to be kept away from its users, I
>> prefer to keep it out of the public header, so the compiler enforces the
>> encapsulation.
>
> I prefer that too, except that it is impossible when users of the
> API need the compiler to know the struct size.

There are cases where the structure of a data type should be
encapsulated, yet its size must be made known for performance (avoid
dynamic memory allocation and pointer chasing).

Need for encapsulation correlates with complex algorithms and data
structures.  The cost of dynamic allocation is often in the noise then.



  reply	other threads:[~2020-11-23  7:53 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-16 22:41 [PATCH v2 0/8] qom: Use qlit to represent property defaults Eduardo Habkost
2020-11-16 22:41 ` [PATCH v2 1/8] qobject: Include API docs in docs/devel/qobject.html Eduardo Habkost
2020-11-17  8:23   ` Marc-André Lureau
2020-11-19  9:37   ` Markus Armbruster
2020-11-19 18:03     ` Eduardo Habkost
2020-11-16 22:41 ` [PATCH v2 2/8] qnum: Make qnum_get_double() get const pointer Eduardo Habkost
2020-11-17  8:26   ` Marc-André Lureau
2020-11-16 22:41 ` [PATCH v2 3/8] qnum: QNumValue type for QNum value literals Eduardo Habkost
2020-11-17  8:37   ` Marc-André Lureau
2020-11-17 14:42     ` Eduardo Habkost
2020-11-17 14:58       ` Marc-André Lureau
2020-11-19 10:24         ` Markus Armbruster
2020-11-19 18:21           ` Eduardo Habkost
2020-11-19 20:55             ` Eduardo Habkost
2020-11-20  9:05               ` Markus Armbruster
2020-11-20  5:29             ` Markus Armbruster
2020-11-20 18:27               ` Eduardo Habkost
2020-11-23  7:51                 ` Markus Armbruster [this message]
2020-11-23 18:33                   ` Eduardo Habkost
2020-11-24  8:49                     ` Markus Armbruster
2020-11-24 14:41                       ` Eduardo Habkost
2020-11-24 15:20                         ` Markus Armbruster
2020-11-24 15:29                           ` Eduardo Habkost
2020-11-25  6:40                             ` Markus Armbruster
2020-11-25 15:01                               ` Eduardo Habkost
2020-11-16 22:41 ` [PATCH v2 4/8] qnum: qnum_value_is_equal() function Eduardo Habkost
2020-11-17  8:42   ` Marc-André Lureau
2020-11-17 15:49     ` Eduardo Habkost
2020-11-17 16:53       ` Marc-André Lureau
2020-11-17 17:21         ` Eduardo Habkost
2020-11-19 10:27   ` Markus Armbruster
2020-11-19 18:24     ` Eduardo Habkost
2020-11-20  6:52       ` Markus Armbruster
2020-11-20 18:22         ` Eduardo Habkost
2020-11-23  8:17           ` Markus Armbruster
2020-11-16 22:41 ` [PATCH v2 5/8] qlit: Support all types of QNums Eduardo Habkost
2020-11-17  8:52   ` Marc-André Lureau
2020-11-19 10:39     ` Markus Armbruster
2020-11-19 18:56       ` Eduardo Habkost
2020-11-20  6:55         ` Markus Armbruster
2020-11-16 22:41 ` [PATCH v2 6/8] qlit: qlit_type() function Eduardo Habkost
2020-11-17  8:53   ` Marc-André Lureau
2020-11-19 10:41   ` Markus Armbruster
2020-11-19 17:56     ` Eduardo Habkost
2020-11-16 22:41 ` [PATCH v2 7/8] qom: Make object_property_set_default() public Eduardo Habkost
2020-11-17  8:56   ` Marc-André Lureau
2020-11-16 22:41 ` [PATCH v2 8/8] qom: Use qlit to represent property defaults Eduardo Habkost
2020-11-17  9:02   ` Marc-André Lureau
2020-11-19 12:39 ` [PATCH v2 0/8] " Markus Armbruster
2020-11-19 17:13   ` Eduardo Habkost
2020-11-19 17:23     ` Paolo Bonzini
2020-11-19 17:55       ` Eduardo Habkost
2020-11-19 18:25         ` Paolo Bonzini
2020-11-19 19:05           ` Eduardo Habkost

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