Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:99759
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 74.125.82.49 as permitted sender)
Date: Wed, 05 Jul 2017 11:51:19 +0100
User-Agent: K-9 Mail for Android
In-Reply-To: <CAH0Uv3HsN6=QLufUBWNRG1hu4Fv4J41qQqXkDSr6hye_OGM-Ew@mail.gmail.com>
References: <CAH0Uv3Gx_OGBA4zwzE97mbK_VtwBtRCX3yn9JNv81VWtQbCYtA@mail.gmail.com> <1499095625.19635.52.camel@schlueters.de> <CAH0Uv3HsN6=QLufUBWNRG1hu4Fv4J41qQqXkDSr6hye_OGM-Ew@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain;
 charset=utf-8
Content-Transfer-Encoding: quoted-printable
To: internals@lists.php.net
Message-ID: <ACF92D26-9103-496B-B3BD-AC738CAF9884@gmail.com>
Subject: Re: [PHP-DEV] "Reader" as alternative to Iterator
From: rowan.collins@gmail.com (Rowan Collins)

On 3 July 2017 16:58:16 BST, Andreas Hennings <andreas@dqxtech=2Enet> wrote=
:
>My motivation was to be able to use iterators and readers
>interchangeably=2E
>Readers are easier to implement as classes=2E
>Iterators have the benefit of the generator syntax=2E
>The idea is to have a library where some stuff is implemented as
>reader classes, and some other things are implemented as iterator
>classes=2E
>
>Then for the actual operational code, I need to choose to use either
>iterator syntax or reader syntax=2E So either I need adapters for all
>iterators, or I need adapters for all readers=2E

An alternative to adapters in this case might be a Trait that allows you t=
o write the class as a Reader, but turn it into a fully-functioning Iterato=
r with one line of code=2E If you always call your read method read() you o=
nly need a single adapter which calls that at the appropriate times and buf=
fers the value to know if it's reached the end=2E That adapter could be "pa=
sted" by a Trait into each class where read() is defined, and read() could =
even be private=2E

Regards,

--=20
Rowan Collins
[IMSoP]