back down on Earth [was: Re: Constructors...]

[Pelle]

On 01/21/2011 02:02 PM, spir wrote:
> On 01/21/2011 04:02 AM, Andrei Alexandrescu wrote:
>> That being said, it's not difficult to define a generic function that
>> copies fields over from one class object to another. Here's a start:
>>
>> import std.stdio;
>>
>> void copyMembers(A)(A src, A tgt) if (is(A == class)) {
>> foreach (e; __traits(allMembers, A)) {
>> static if (!is(typeof(__traits(getMember, src, e)) == function)
>> && e != "Monitor")
>> {
>> __traits(getMember, tgt, e) = __traits(getMember, src, e);
>> }
>> }
>> }
>
> <side-note>
> How many programmers in the world consider this kind of code "not
> difficult"? These few lines mix 3 features I personly find, say,
> 'special': generics using 'is' constraints, static if, __traits.
> <personal> From those 3, static if is not ugly. </personal>
>
> Is code like this supposed to be considered normal? Where is D2 speak
> going to? Merge into this a handful of range/algos, a pinch of happy
> qualifiers here & there, a specimen of... string-mixin ;-)
>
> How to welcome newcomers?
> </side-note>
>
> Denis
> _________________
> vita es estrany
> spir.wikidot.com
>

What you're saying doesn't make sense. :-)

You welcome them by saying they can copy a class object by using 
copyMembers. Newcomers may not write that code, but using it is dead simple.

I suspect most D users couldn't implement floating point formatting 
either, or a bunch of other hard stuff.