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view gcc/testsuite/g++.dg/cpp1z/class-deduction25.C @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 84e7813d76e9 |
children |
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// Testcase from P0512R0 for C++17 NB comment US 19 // { dg-do compile { target c++17 } } template<typename> struct remove_ref; template<typename _Tp> struct remove_ref { typedef _Tp type; }; template<typename _Tp> struct remove_ref<_Tp&> { typedef _Tp type; }; template<typename _Tp> struct remove_ref<_Tp&&> { typedef _Tp type; }; template<typename _Tp> using remove_ref_t = typename remove_ref<_Tp>::type; template<class T> struct A { A(T, int*); // #1 A(A<T>&, int*); // #2 enum { value }; }; template<class T, int N = remove_ref_t<T>::value> A(T&&, int*) -> A<T>; //#3 A a{1,0}; // uses #1 to deduce A<int> and initializes with #1 A b{a,0}; // uses #2 to deduce A<int> and initializes with #2 template <class,class> struct same; template <class T> struct same<T,T> {}; same<decltype(a),A<int>> s1; same<decltype(b),A<int>> s2;