[Issue 7430] opCmp doesn't support unordered value comparison.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7430


Simen Kjaeraas <simen.kjaras at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |simen.kjaras at gmail.com


--- Comment #3 from Simen Kjaeraas <simen.kjaras at gmail.com> 2012-02-03 12:55:20 PST ---
"a @ b is rewritten as a.opCmp(B) @ 0"

And there you have it. What return type and value for opCmp fulfills this
requirement? I'll tell you: float and nan.

Example:

struct Foo {
    float opCmp(Foo other) {
        return float.nan;
    }
}

unittest {
    assert( !(Foo() < Foo() ));
    assert( !(Foo() <= Foo()) );
    assert( !(Foo() > Foo() ));
    assert( !(Foo() >= Foo() ));
}

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