[erlang-questions] Extensions to comprehensions eeps
Thu Jul 31 11:35:50 CEST 2008
On Thu, 31 Jul 2008 05:59:27 pm Vlad Dumitrescu wrote:
> 2008/7/31 Hynek Vychodil <>
> > There is functional difference, between <- and <= is not functional
> > difference.
> > There is not reason why
> > [X || <<X>> <- <<"abc">> ].
> > should not return same result as
> > > [X || <<X>> <= <<"abc">> ].
> > "abc"
> I might be mistaken here, but I think the issue is that the compiler
> generates completely different code for each case and when the generator
> looks like X <- Y, i.e. the right side is not a constant, it has to know
> which one to produce. The compiler can't guess from the source code,
> because for example <<X>> <- L is a very normal list generator, one can't
> assume L is a binary.
> best regards,
Or they could define some virtual machine instructions for iterating over
collections so that the compiler's generated code is the same for all cases.
Anthony Shipman Mamas don't let your babies
grow up to be outsourced.
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