[Issue 4290] 'Fragile' opCmp/toHash signature errors

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4290


Kevin Bealer <kevinbealer at gmail.com> changed:

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                 CC|                            |kevinbealer at gmail.com


--- Comment #1 from Kevin Bealer <kevinbealer at gmail.com> 2010-09-15 21:26:18 PDT ---
Just ran into this as well; also, note that the page here gives the wrong
version of the signature; it omits the critical const, so anyone running into
this problem will be misguided.

http://www.digitalmars.com/d/2.0/operatoroverloading.html#compare

Also... it looks like some of the standard code such as in std.bitarray does
this without the "const", so I imagine the standard library is broken, though I
haven't tested whether bitarray's sort properly.

I agree with bearophile's recommendation -- there is no value in accepting a
signature for "standard" interfaces like opCmp that will not work.

One other detail: both of the opCmp signatures seem to work when "<" is used,
but for some reason, not with .sort. ??

I'm testing with 2.048.

Thanks,
Kevin Bealer

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