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August 29, 2011 struct opEquals does not work with parameter of same type - bug or feature? | ||||
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I am trying to build a struct with equality testing, using this code: struct Foo { const bool opEquals(Foo f) { return true; } } This gives me the error that the parameter should be of type "ref const Foo". Fine. struct Foo { const bool opEquals(ref const Foo f) { return true; } } This, however, does not work with code like: Foo bar() { return Foo(); } assert(Foo() == bar()); "function Foo.opEquals(ref const const(Foo) f) const is not callable using argument types (Foo)" and "bar() is not an lvalue". How can I do this? |
August 30, 2011 Re: struct opEquals does not work with parameter of same type - bug or feature? | ||||
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Posted in reply to Sean Eskapp | On Monday, August 29, 2011 22:41:26 Sean Eskapp wrote: > I am trying to build a struct with equality testing, using this code: > > struct Foo > { > const bool opEquals(Foo f) > { > return true; > } > } > > This gives me the error that the parameter should be of type "ref const Foo". Fine. > > struct Foo > { > const bool opEquals(ref const Foo f) > { > return true; > } > } > > This, however, does not work with code like: > > Foo bar() > { > return Foo(); > } > > assert(Foo() == bar()); > > "function Foo.opEquals(ref const const(Foo) f) const is not callable using > argument types (Foo)" and "bar() is not an lvalue". > > How can I do this? http://d.puremagic.com/issues/show_bug.cgi?id=3659 http://stackoverflow.com/questions/6986175/const-ref-and-rvalue-in-d - Jonathan M Davis |
August 30, 2011 Re: struct opEquals does not work with parameter of same type - bug or feature? | ||||
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Posted in reply to Jonathan M Davis | == Quote from Jonathan M Davis (jmdavisProg@gmx.com)'s article
> On Monday, August 29, 2011 22:41:26 Sean Eskapp wrote:
> > I am trying to build a struct with equality testing, using this code:
> >
> > struct Foo
> > {
> > const bool opEquals(Foo f)
> > {
> > return true;
> > }
> > }
> >
> > This gives me the error that the parameter should be of type "ref const Foo". Fine.
> >
> > struct Foo
> > {
> > const bool opEquals(ref const Foo f)
> > {
> > return true;
> > }
> > }
> >
> > This, however, does not work with code like:
> >
> > Foo bar()
> > {
> > return Foo();
> > }
> >
> > assert(Foo() == bar());
> >
> > "function Foo.opEquals(ref const const(Foo) f) const is not callable using
> > argument types (Foo)" and "bar() is not an lvalue".
> >
> > How can I do this?
> http://d.puremagic.com/issues/show_bug.cgi?id=3659 http://stackoverflow.com/questions/6986175/const-ref-and-rvalue-in-d - Jonathan M Davis
Ah, thanks!
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