Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp1z/class-deduction38.C @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
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date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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// { dg-do compile { target c++17 } } template <class T> struct A { using value_type = T; A(value_type); // #1 A(const A&); // #2 A(T, T, int); // #3 template<class U> A(int, T, U); // #4 }; // A(A); #5, the copy deduction candidate A x (1, 2, 3); // uses #3, generated from a non-template constructor template <class T> A(T) -> A<T>; // #6, less specialized than #5 A a (42); // uses #6 to deduce A<int> and #1 to initialize A b = a; // uses #5 to deduce A<int> and #2 to initialize template <class T> A(A<T>) -> A<A<T>>; // #7, as specialized as #5 A b2 = a; // uses #7 to deduce A<A<int>> and #1 to initialize template <class,class> struct same; template <class T> struct same<T,T> {}; same<decltype(a),A<int>> s1; same<decltype(b),A<int>> s2; same<decltype(b2),A<A<int>>> s3;