Head Const

Dicebot via Digitalmars-d digitalmars-d at puremagic.com
Tue Feb 16 03:27:56 PST 2016


On 02/16/2016 12:48 AM, Walter Bright wrote:
> rears its head again :-)
> 
> Head Const is what C++ has for const, i.e. it is not transitive, applies
> to one level only. D has transitive const.
> 
> What head const will do for us:
> 
> 1. make it easy to interface to C++ code that uses const, as currently
> it is not very practical to do so, you have to resort to pragma(mangle)
> 
> 2. supports single assignment style of programming, even if the data is
> otherwise mutable
> 
> The downside is, of course, language complexity.

Moderately skeptical here. Adding features to the language for the sake
of C++ compatibility is good way to ensure C++ compatibility will be its
only domain of triumph. I'd expect more justification for users who
don't care about C++ but want language which doesn't collapse under own
weight.


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