Floating point types default to NaN?
Michael V. Franklin
slavo5150 at yahoo.com
Mon Nov 27 23:05:55 UTC 2017
On Saturday, 25 November 2017 at 22:13:43 UTC, Adam D. Ruppe
wrote:
> It technically did:
>
> https://dlang.org/spec/function.html#local-variables
>
> "It is an error to use a local variable without first assigning
> it a value. The implementation may not always be able to detect
> these cases. Other language compilers sometimes issue a warning
> for this, but since it is always a bug, it should be an error. "
>
>
> But that paragraph was never implemented (it is a bit easier
> said than done to actually detect given if conditions and stuff
> too, especially in the early days of D when the compiler didn't
> even make any effort to track such things, though it does
> now...). The compiler author took the easy way out of
> initializing them to invalid values instead.
WOW!! I am shocked to learn this. All this time, I though it was
a design oversight. I think I'm going to implement a feature
gate to require explicit initialization. It would be better to
be strict up front and relax it as flow control analysis becomes
more mature.
Mike
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