[Bug c++/67768] Second and subsequent captured variable in variadic template unpaking are default constructed
pinskia at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Aug 23 07:20:58 GMT 2021
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67768
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|UNCONFIRMED |RESOLVED
Target Milestone|--- |8.0
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed in GCC 8. Here is a self contained testcase (no libstdc++ involved):
template<int I,class T>T echo(T v) { return v; }
template<typename ...T> struct run1;
template<> struct run1<>{};
template<typename T> struct run1<T>{run1(T a){a();}};
template<typename T, typename ...T1>
struct run1<T, T1...>
: run1<T1...>{run1(T a, T1... b) : run1<T1...>(b...) {a();}};
template<typename ...T>
void run11(T... a)
{
run1<T...>(a...);
}
template<int... Is>void run(void)
{
int x = 10;
run11(echo<Is>([y=x](){if (y!=10) __builtin_abort();})...);
}
int main()
{
run<0,1,2>();
}
-------- CUT ----------
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