DIP1027 + Design by Introspection

12345swordy alexanderheistermann at gmail.com
Tue Feb 2 18:36:30 UTC 2021

On Tuesday, 2 February 2021 at 15:55:23 UTC, Daniel N wrote:
> DIP1027 + Design by Introspection
> Since DIP1027 is simpler than DIP1036 I wanted to take a step 
> back and see what could be done to fix DIP1027 to be even 
> better than DIP1036.
> 1) q{} is designed for code generation it needs to be supported 
> with Interpolation.
> 2) DbI
> IMHO both DIP1027 and DIP1036 suffers when trying to support 
> custom formatting...
> which makes the syntax as hard to read as the original manual 
> writefln format string.
> My DIP1027+ proposal is based on UDA and can support any 
> function with trivial syntax.
>   printf(i"I ate $apples and $bananas totalling $(apples + 
> bananas) fruit.");
> writefln(i"I ate $apples and $bananas totalling $(apples + 
> bananas) fruit.");
> Key insight, the function specifies what format it expects.
> printf(...)   @formatting!printf_style
> writefln(...) @formatting!writefln_style
> This way it doesn't have to be repeated in user-facing code 
> over and over.
> Basically the compiler will invoke "printf_style!int" and the 
> function will return "%d",
> the compiler doesn't know anything about printf, it will just 
> introspect/ask the function.

We don't need more built in attributes to an attribute filled 


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