Newsgroup: comp.lang.c++
Subject: Follow-up Pimpl question
From: Rupert Swarbrick <rswarbrick@...>
Date: Mon, 21 Oct 2013 23:39:27 +0100
I'm coming back to writing some C++ after a few years in Lisp-land, and
was wondering about the "pimpl idiom". I understand how to write and use
it, and have done in the past. However, I don't really understand what
it gains you over having an abstract base class in the header, along
with a factory function.
Presumably there's a significant difference, since people put up with
the reams of boilerplate required for passing functions through to the
implementation object. Can anyone explain to me what it is?
Rupert
PS: I'm not sure whether there are strong feelings about whether to use
this idiom or not. To be clear, I'm not trying to hear them! I can
see obvious downsides to keeping a pointer to an implementation
object (verbosity; have to be careful about destructor +
exceptions...) and I'm interested to know what the upsides are.
Subject: Follow-up Pimpl question
From: Rupert Swarbrick <rswarbrick@...>
Date: Mon, 21 Oct 2013 23:39:27 +0100
I'm coming back to writing some C++ after a few years in Lisp-land, and
was wondering about the "pimpl idiom". I understand how to write and use
it, and have done in the past. However, I don't really understand what
it gains you over having an abstract base class in the header, along
with a factory function.
Presumably there's a significant difference, since people put up with
the reams of boilerplate required for passing functions through to the
implementation object. Can anyone explain to me what it is?
Rupert
PS: I'm not sure whether there are strong feelings about whether to use
this idiom or not. To be clear, I'm not trying to hear them! I can
see obvious downsides to keeping a pointer to an implementation
object (verbosity; have to be careful about destructor +
exceptions...) and I'm interested to know what the upsides are.
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