Comments on: An Implementation Helper For The Curiously Recurring Template Pattern

By: Jonathan Boccara

Jonathan Boccara — Wed, 01 Aug 2018 22:04:00 +0000

In reply to sephorusFR. Always welcome :)

By: sephorusFR

sephorusFR — Tue, 31 Jul 2018 18:25:00 +0000

In reply to Jonathan Boccara. FWIW, I usually call crtp as static_base and underlying() is self(). My 2cts

By: Panos KJ

Panos KJ — Fri, 20 Jul 2018 10:02:00 +0000

While writing a CRTP class I found an alternative to the private constructor + friend trick. First, define a static method in which you static_assert T is convertible to CRTP. Then call this method inside the constructor(s) of CRTP and you get very descriptive error messages.

By: Wei Ni

Wei Ni — Sun, 14 Jan 2018 04:46:00 +0000

Another way to avoid diamond inheritance :
template struct crtp{…}
template struct Square: crtp {…}
template struct Scale: crtp {…}
class Sensitivity : public Scale, public Square{…}

By: Mike D.

Mike D. — Wed, 06 Sep 2017 13:47:00 +0000

Thanks, Jonathan! An excellent little article.

By: Jonathan Boccara

Jonathan Boccara — Tue, 04 Jul 2017 09:50:00 +0000

In reply to Bryce Schober. Sorry this is not clear enough. Do you have something specific in mind that would help make it more obvious?

By: Jonathan Boccara

Jonathan Boccara — Tue, 04 Jul 2017 09:49:00 +0000

In reply to Bryce Schober. I count on the fact that CRTP is now a ubiquitous enough name for a design pattern, so that it's instantly recognizable in code. Don't you think it's the case?

By: Bryce Schober

Bryce Schober — Fri, 30 Jun 2017 22:01:00 +0000

Along your line of thought in making template names more expressive… what could be a more expressive name for crtp?

By: Bryce Schober

Bryce Schober — Fri, 30 Jun 2017 22:00:00 +0000

Hmm… as a early-learning reader, the usage of the two-template-parameter crtp is not obvious. You didn’t provide a refreshed example here, nor has your NamedType crtp.hpp (https://github.com/joboccara/NamedType/blob/master/crtp.hpp) been update to be exemplary.

By: Jonathan Boccara

Jonathan Boccara — Thu, 25 May 2017 15:58:00 +0000

In reply to Daniel Houck.

Hey Daniel,
1- I’ve tried your idea and it doesn’t solve the problem, unfortunately. I guess this is because there are still two paths from crtp down to Sensitivity.
2- I’ve tried all combinations, and the top layer only needs to declare the middle-layer friend. That’s a very good point, I’m going to amend the post with this. Thanks Daniel!