https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68177
Bug ID: 68177
Summary: Lambda capture doesn't work correctly when lambda is
used in a pack expansion
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rs2740 at gmail dot com
Target Milestone: ---
Repro:
void swallow(...) {}
template<int... Is>
void foo() {
int t = 0;
swallow(
([&t]{return 0;}(), Is)...
);
}
int main()
{
foo<1, 2>();
return 0;
}
gcc HEAD 6.0.0 20151031 (experimental) reports:
prog.cc: In instantiation of 'void foo() [with int ...Is = 1, 2]':
prog.cc:13:13: required from here
prog.cc:6:5: error: member 'foo() [with int ...Is = 1, 2]::<lambda()>::<t
capture>' is uninitialized reference
([&t]{return 0;}(), Is)...
^
It appears that only the capture in the first element in the pack expansion
gets initialized correctly.
Clang accepts this code, as does MSVC.
