Why does intpromote spew warnings for ~ operator?

[Guillaume Piolat]

On Monday, 13 September 2021 at 22:27:11 UTC, Alexey wrote:
>
> It's also not exactly clear why:
> 1. D should be backward compatible with C, which is 50 years 
> old soon.

A lot of the current D ecosystem (that wants to be simple to 
build) relies on translated C: bindings, and stuff like codecs 
are especially hard to translate error-free.
So it is valuable to be backward compatible with C, in the sense 
that a copy-paster C expression should work or not build.

Note that this isn't still the case, for example:

     int fun(int[4] a)
     {
         // stuff
     }

     void foo()
     {
         int[4] b;
         fun(a); // passed by value in D, passed by pointer in C
     }

ImportC will help a lot here, for example if like me you'd like a 
WebP decoder in pure D there are none, it is just too big to 
translate.


> 2. why exactly somebody should copy / paste (how many? 
> thousands?) many lines of code without thinking and rechecking. 
> Probably D can't be and shouldn't be compatible with C / C++ to 
> that distinct.

It's very labor intensive to translate C to D, and a little 
mistake can bury the effort.


> 3. Is really backward comparability with C/C++ so important?

C and C++ are different languages, the one reason C++ has 
succeeded is "C/C++", being able to compile C code.