diff options
Diffstat (limited to 'gcc/testsuite/g++.dg/cpp1z/decomp37.C')
-rw-r--r-- | gcc/testsuite/g++.dg/cpp1z/decomp37.C | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp1z/decomp37.C b/gcc/testsuite/g++.dg/cpp1z/decomp37.C new file mode 100644 index 00000000000..dc47908cddf --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1z/decomp37.C @@ -0,0 +1,62 @@ +// { dg-additional-options -std=c++17 } +// { dg-do compile } + +#include <memory> +#include <tuple> +#include <string> + +struct X : private std::shared_ptr<int> +{ + std::string fun_payload; +}; + +template<int N> std::string& get(X& x) +{ + if constexpr(N==0) return x.fun_payload; +} + +namespace std { + template<> class tuple_size<X> : public std::integral_constant<int, 1> {}; + template<> class tuple_element<0, X> {public: using type = std::string;}; +} + +struct X2 : private std::shared_ptr<int> +{ + int fun_payload; + template <class T> void get(); +}; + +template<int N> int& get(X2& x) +{ + if constexpr(N==0) return x.fun_payload; +} + +namespace std { + template<> class tuple_size<X2> : public std::integral_constant<int, 1> {}; + template<> class tuple_element<0, X2> {public: using type = int;}; +} + +class X3 +{ + double fun_payload; +public: + template <int N> double& get() + { + if constexpr(N==0) return fun_payload; + } +}; + +namespace std { + template<> class tuple_size<X3> : public std::integral_constant<int, 1> {}; + template<> class tuple_element<0, X3> {public: using type = double;}; +} + +int main() +{ + X x; + auto& [b1] = x; + X2 x2; + auto& [b2] = x2; + X3 x3; + auto& [b3] = x3; +} |