DIP 1027---String Interpolation---Community Review Round 1

Alexandru Ermicioi alexandru.ermicioi at gmail.com
Wed Dec 11 14:30:17 UTC 2019

On Wednesday, 11 December 2019 at 11:01:58 UTC, MrSmith wrote:
> On Wednesday, 11 December 2019 at 10:57:13 UTC, Alexandru 
> Ermicioi wrote:
>> Why not just split interpolated string into just a tuple of 
>> args & strings. For example:
>> Given: (i"I ate %apples and %bananas totalling %(apples + 
>> bananas) fruit.")
>> Is lowered to a tuple: ("I ate ", apples, " and ", bananas," 
>> totalling ", apples + bananas," fruit.")
> That's an option, but one would also need to figure out 
> handling of format specifiers

Do we really need support for format specifiers which are mostly 
appliable for primitive numeric type? I doubt existing format 
specifiers could be used with structs, classes, or any aggregate 

An alternative to specifiers we could define free functions that 
would format numeric values as needed allowing us to write smth 

i"I ate %apples and %bananas totalling %(apples + 

then, accepting function wouldn't require to meddle with specific 
printf semantics, and will get properly pre-formatted data to 

if format specifiers are still desired they could be passed as 
separate arguments similar how it is done for getopts, and then 
accepting function would need to treat them in context of passed 

Best regards,

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