The pull request of the day: 3998

[eles via Digitalmars-d]

Hello everybody,

All D contributors are invited to have a look at this pull
request. It is fairly important for the D language, as it
implements the multiple alias this.

The pull request number: 333998

https://github.com/D-Programming-Language/dmd/pull/3998

Please focus attention on it today (well, the next 24 hours, it
depends when your day starts).

Let's bring'it to a state of: "to be merged" or "to be rejected".

Many thanks.

[H. S. Teoh via Digitalmars-d]

Post by eles via Digitalmars-d
Hello everybody,
All D contributors are invited to have a look at this pull request. It
is fairly important for the D language, as it implements the multiple
alias this.

[...]

PR of the *day*?? More like PR of the *year*. I've been waiting for
multiple alias this for a looong time, ever since I read about it in
TDPL.


T

[Jonathan via Digitalmars-d]

What are some "common uses" for multiple aliasing? I understand
the feature, but curious where it would be commonly employed.

To me, this allows structs to have something like inheritance.
You add a property for another struct that acts like an interface
and alias that struct to the current one. Thoughts?

[Jonathan via Digitalmars-d]

Btw, is the C++ equivalent (roughly) to this be the casting
operator?
http://en.cppreference.com/w/cpp/language/cast_operator

[ketmar via Digitalmars-d]

On Tue, 07 Oct 2014 17:36:22 +0000

Post by Jonathan via Digitalmars-d
What are some "common uses" for multiple aliasing? I understand
the feature, but curious where it would be commonly employed.

it was already discussed in this NG.
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[Dicebot via Digitalmars-d]

Post by Jonathan via Digitalmars-d
What are some "common uses" for multiple aliasing? I understand
the feature, but curious where it would be commonly employed.
To me, this allows structs to have something like inheritance.
You add a property for another struct that acts like an
interface and alias that struct to the current one. Thoughts?

Multiple inheritance of implementation for structs + implicit
casting in one basket

[H. S. Teoh via Digitalmars-d]

What are some "common uses" for multiple aliasing? I understand the
feature, but curious where it would be commonly employed.
To me, this allows structs to have something like inheritance. You
add a property for another struct that acts like an interface and
alias that struct to the current one. Thoughts?

Multiple inheritance of implementation for structs + implicit casting
in one basket

Also, transparent proxying of heterogenous interfaces. TDPL contains an
example (or two) of this.


T

[monarch_dodra via Digitalmars-d]

Post by Dicebot via Digitalmars-d

Post by Jonathan via Digitalmars-d
What are some "common uses" for multiple aliasing? I
understand the feature, but curious where it would be commonly
employed.
To me, this allows structs to have something like inheritance.
You add a property for another struct that acts like an
interface and alias that struct to the current one. Thoughts?

Multiple inheritance of implementation for structs + implicit
casting in one basket

I wish that's what we used it for. More often than not, it's used
to simulate implicit casting, sometimes with catastrophic results
in generic code...