DIP 1018--The Copy Constructor--Formal Review

[Atila Neves]

On Tuesday, 26 February 2019 at 03:56:27 UTC, Walter Bright wrote:
> On 2/25/2019 7:45 AM, Atila Neves wrote:
>> I have no idea what people are talking about when they mention 
>> on this forum that D's const is useless. Nearly every function 
>> parameter in my code is `in`. Nearly every variable 
>> declaration uses `const` instead of `auto`, the main exception 
>> being when a function is constructing a value to return. Most 
>> member functions I write are const or inout. I use const in D 
>> as I do in C++: pretty much everywhere. Nearly every single 
>> time a function parameter in my code isn't const is when it's 
>> an input range.
>
> I'm going to make an educated guess that you're experienced at 
> FP programming!

Indeed.

Functional is my default in any language. The good thing about D 
is I can get my hands dirty when needed as opposed to jumping 
through hoops or forcing me to use recursion when it doesn't fit 
the problem (hello C++ metaprogramming).

I'd love it if functions were `@safe` and `pure` by default.