write(f)ln style exception factory

[Element 126 via Digitalmars-d]

On 06/14/2014 09:04 PM, Dmitry Olshansky wrote:
> Recalling the previous discussion of throwing exception being costly, I
> thought the idiom of "pay as you go" is worth incorporating into the
> standard library.
>
> In brief:
>
> throw exception("CPU temperature is below", 2.5, "K");
> vs
> throw new Exception(text("CPU temperature is below", 2.5, "K"));
> or:
> enforce(false, text("CPU temperature is below", 2.5, "K"));
>
> The benefit that the latter will only construct string if printing is
> indeed requested.
>
> Proof of concept:
> https://gist.github.com/DmitryOlshansky/59ec5953874bc1985ac5
>
> The problem with it is that for some reason writeln of exception won't
> compile while thrown exception is printed just fine by the trace handler.
>
> Thoughts?
>

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writeln(myException.info);
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