enum true, or 1

[Brian Tiffin]

On Thursday, 22 July 2021 at 03:58:38 UTC, Ali Çehreli wrote:
> On 7/21/21 8:44 PM, Brian Tiffin wrote:
>
> > What is the preferred syntax for simple on/off states?
>
> I use std.typecons.Flag. It feels very repetitive but that's 
> what we have:
>
> import std.typecons;
>
> void foo(Flag!"doFilter" doFilter) {
>   if (doFilter) {
>     // ...
>   }
> }
>
> bool someCondition;
>
> void main() {
>   // Literal values of Flag!"doFilter"
>   foo(Yes.doFilter);
>   foo(No.doFilter);
>
>   // Assuming we start with an existing 'bool'...
>   bool doFilter = someCondition;
>   // ... I like this helper (see below):
>   foo(flagFromBool!doFilter);
> }
>
> template flagFromBool(alias variable) {
>   enum flagName = variable.stringof;
>
>   auto flagFromBool() {
>     import std.format : format;
>
>     enum expr = format!q{
>       return variable ? Yes.%s : No.%s;
>     }(flagName, flagName);
>
>     mixin (expr);
>   }
> }
>
> > Did I read that
> > D was moving to strictly 1 and 0 literals instead of
> true/false on/off
> > yes/no?
>
> Walter sees 'bool' as a 1-bit integer type. I can't. :) I 
> cringe everytime I see assert(0). To me, it is assert(false); :/
>
> > If so, is there an idiom for yes/no/maybe  -1,0,1
> less/equal/greater?
>
> opCmp's return value has three states:
>
>  < 0
>  == 0
>  > 0
>
> Ali

So would there be any cringes seeing a skeleton D source file 
that always ended with

~~~d
/++
    Disclaimer

     This software is distributed in the hope that it will be 
useful, but
     WITHOUT ANY WARRANTY; direct or indirect, without even the 
implied
     warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
PURPOSE.
+/
enum INDEMNITY = true;
~~~ ??

The goal is attaching backmatter doc comments to a declaration 
that follows without being too intrusive.

Thanks for the wisdoms, Ali (and Mathias).