Discussion Thread: DIP 1036--String Interpolation Tuple Literals--Community Review Round 2

[Imperatorn]

On Thursday, 4 February 2021 at 12:56:14 UTC, Adam D. Ruppe wrote:
> On Thursday, 4 February 2021 at 12:27:49 UTC, Imperatorn wrote:
>> Or get rid of $ like in C# and have
>>
>> i"I ate {nrOfApples} apples today" and
>> i"I ate {nrOfApples + nrOfOranges} fruits today"
>>
>> Clean imo
>
> Note that we chose the sequence ${expr} to avoid duplicating 
> standard uses of symbols inside strings.
>
> This next bit isn't in the dip but Just using {} alone would 
> conflict with tons of D syntax.
>
> mixin(iq{ void foo() { is this a function body or an 
> interpolated section? } });

That would be like an interpolated verbatim string.

"iq" would be roughly equal to "$@" in that case.

In the example you provided, it depends on what character is 
used. If { and } are used (instead of $), you need to escape 
those by { and }.

Example in C# ("@" removed from "@$" because no escape characters 
are present, also, since 8.0 the order doesn't matter, ie @$ EQU 
$@):

1. string s = $"{ void foo() { is this a function body or an 
interpolated section? } }";
2. string s = $"{{ void foo() { is this a function body or an 
interpolated section? } }}";

In case 1 the entire expression is evaluated, in case 2 the 
beginning and end curly brackets are "escaped" and therefore the 
inner expression is evaluated.

More information can be found here:
https://docs.microsoft.com/en-us/dotnet/csharp/tutorials/string-interpolation
https://docs.microsoft.com/en-us/dotnet/standard/base-types/composite-formatting