https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82308
Bug ID: 82308
Summary: [C++17] deduction of template arguments results in
internal compiler error
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sdalleig at mmci dot uni-saarland.de
Target Milestone: ---
Please consider the following code (gcc.godbolt.org link:
https://godbolt.org/g/EX9Fko)
#include <array>
template <size_t R>
class X {
public:
using T = std::array<int, R>;
enum class C : uint8_t { A, B };
X(T bounds, C c = C::B) : t(bounds) {}
private:
T t;
};
// fix;
// template <size_t R>
// X(std::array<int, R>, ...)->X<Rank>;
int main(void)
{
std::array<int, 2> a;
X d{a}; //cannot be deduced
X<2> e{a}; // works
}
output:
In constructor 'X<R>::X(X<R>::T, X<R>::C)':
22 : <source>:22:13: internal compiler error: unexpected expression 'R' of kind
template_parm_index
