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* [Bug c++/81157] If constexpr does not support Short-circuit evaluation
[not found] <bug-81157-4@http.gcc.gnu.org/bugzilla/>
@ 2021-09-20 21:19 ` arthur.j.odwyer at gmail dot com
2021-09-21 17:56 ` ppalka at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: arthur.j.odwyer at gmail dot com @ 2021-09-20 21:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81157
Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |arthur.j.odwyer at gmail dot com
--- Comment #1 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> ---
I'd say neither a bug nor a defect. In `if constexpr (X && Y)`, `X && Y` is an
expression and it must be well-formed, even if it's false -- just like if you
did `static_assert((X && Y) == false)`. GCC is behaving according to the C++
Standard in this case.
Recommend closing as INVALID.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/81157] If constexpr does not support Short-circuit evaluation
[not found] <bug-81157-4@http.gcc.gnu.org/bugzilla/>
2021-09-20 21:19 ` [Bug c++/81157] If constexpr does not support Short-circuit evaluation arthur.j.odwyer at gmail dot com
@ 2021-09-21 17:56 ` ppalka at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: ppalka at gcc dot gnu.org @ 2021-09-21 17:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81157
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |ppalka at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Agreed.
If you need short-circuiting evaluation inside a constexpr if, just encode the
condition as a nested-requirement:
if constexpr (requires { requires IsContainer<V> && Same<typename
V::innerType, int>; })
...
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <bug-81157-4@http.gcc.gnu.org/bugzilla/>
2021-09-20 21:19 ` [Bug c++/81157] If constexpr does not support Short-circuit evaluation arthur.j.odwyer at gmail dot com
2021-09-21 17:56 ` ppalka at gcc dot gnu.org
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