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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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