https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92580
Bug ID: 92580
Summary: "if constexpr" not discarding branch
Product: gcc
Version: 9.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: paultargosz86 at googlemail dot com
Target Milestone: ---
"if constexpr" uses std::is_same to check type. depending on the type its using
different if-branches, that can have or have not member variables. The
"discarded Branch" tries to use nonexistent membervariables and fails
therefore.
https://godbolt.org/z/jw_BAy
differentiation:
Bug 85689 is static_assert that is not proposed in "if constexpr" e.g.
wg21.link/p0292
