| // Contributed by Dodji Seketeli <dodji@redhat.com> |
| // Origin PR debug/30161 |
| // { dg-do compile { target c++11 } } |
| // { dg-options "-gdwarf-2 -dA" } |
| // |
| // In theory the compiler instantiates count<int, char, long>, |
| // count<char, long> and count<long>. In practice, only |
| // count<int, char, long> is emitted, thanks to constant folding. |
| // So in theory, each of the 3 instances of count yields a |
| // DW_TAG_GNU_template_parameter_pack DIE, but in practise, there is only one |
| // DW_TAG_GNU_template_parameter_pack as there is only count<int, char, long> |
| // is emitted. |
| // { dg-final { scan-assembler-times "DIE \\(0x\[^\n\]*\\) DW_TAG_GNU_template_parameter_pack" 1} } |
| // { dg-final { scan-assembler-times "DIE \\(0x\[^\n\]*\\) DW_TAG_template_type_param" 3} } |
| |
| |
| template <typename... Args> struct count; |
| |
| template <> |
| struct count<> |
| { |
| static const int value = 0; |
| }; |
| |
| template <typename T, typename... Args> |
| struct count<T, Args...> |
| { |
| static const int value = 1 + count<Args...>::value; |
| }; |
| |
| template<typename... P> |
| int |
| do_count() |
| { |
| return count<P...>::value; |
| } |
| |
| int c = do_count<int, char, long>(); |
| |