DIP 1019--Named Arguments Lite--Community Review Round 1

[12345swordy]

On Friday, 15 February 2019 at 21:05:38 UTC, Golden Rockefeller 
wrote:
> On Friday, 15 February 2019 at 12:56:45 UTC, Mike Parker wrote:
>> This is the feedback thread for the first round of Community 
>> Review for DIP 1019, "Named Arguments Lite":
>>
>> https://github.com/dlang/DIPs/blob/23ef47a94e0fdd5ddc4b2f6b2f4dcfd3c1f43aa6/DIPs/DIP1019.md
>>
>> All review-related feedback on and discussion of the DIP 
>> should occur in this thread. The review period will end at 
>> 11:59 PM ET on March 1, or when I make a post declaring it 
>> complete.
>>
>> At the end of Round 1, if further review is deemed necessary, 
>> the DIP will be scheduled for another round of Community 
>> Review. Otherwise, it will be queued for the Final Review and 
>> Formal Assessment by the language maintainers.
>>
>> Please familiarize yourself with the documentation for the 
>> Community Review before participating.
>>
>> https://github.com/dlang/DIPs/blob/master/PROCEDURE.md#community-review
>>
>> Thanks in advance to all who participate.
>
> As another alternative, named parameters can be implemented 
> using Tuple/tuple from the Phobos Library. This alternative 
> solution will prevent silent breakage. The caller can not 
> opt-out. This solution adds even more noise to function calls  
> but typedef can reduce the noise. This solution does not 
> address reordering but can be combined with other solutions 
> that allow for reordering. Here is an example:
>
>
> import std.typecons;
> double get_area(Tuple!(double, "radius") t_radius) {
>     double radius = t_radius.radius;
>     return 3.14 * radius * radius;
> }
>
> double get_area(Tuple!(double, "diameter") t_diameter) {
>     double radius = t_diameter.diameter / 2;
>     return 3.14 * radius * radius;
> }
>
> void main()
> {
>     import std.stdio;
>     auto area = get_area(tuple!"radius"(4.));
>     writeln("Area with radius: ", area);
>     area = get_area(tuple!"diameter"(8.));
>     writeln("Area with diameter: ", area);
> }

The downside to your solution is an increases in memory.