[Bug c++/95100] <ranges> xxx_view adaptors don't work with pipeline operator
ppalka at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Fri May 15 14:10:30 GMT 2020
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95100
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |ppalka at gcc dot gnu.org
--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to rhalbersma from comment #0)
> Combining the std::ranges::xxx_view adaptors with the pipeline operator does
> not compile, in contrast to the supposedly expression equivalent
> std::ranges:views::xxx
Hmm, I don't see anything in the spec that would imply views::xxx should be
expression-equivalent to xxx_view. What I see is that views::xxx(E) is, for
some values of E, expression-equivalent to xxx_view{E}.
For instance [range.reverse.overview] says:
Given a subexpression E, the expression views::reverse(E) is
expression-equivalent to:
[...]
- Otherwise, equivalent to reverse_view{E}.
Could you point me to the relevant bits of the spec that would imply this
stronger expression-equivalence?
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