https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102104
Bug ID: 102104
Summary: parameter packs not expanded with '...' for operator
conversions
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Originally the second testcase from PR 79094 but the first one has since been
fixed.
Take -std=c++17:
template<typename A, typename B>
struct unvariadic: private A, private B {
// okay, provided A and B each declare appropriate
// target_type and operator target_type() members
using A::operator typename A::target_type,
B::operator typename B::target_type;
};
template<typename... Bases>
struct variadic: private Bases... {
// error: parameter packs not expanded with '...':
using Bases::operator typename Bases::target_type...;
};
This should compile just as ICC and clang do.
