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comparison gcc/testsuite/g++.dg/cpp0x/variadic-tuple2.C @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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68:561a7518be6b 111:04ced10e8804
1 // PR c++/67164
2 // { dg-do compile { target c++11 } }
3
4 #include <type_traits>
5
6 namespace detail {
7 template <bool ...b>
8 struct fast_and
9 : std::is_same<fast_and<b...>, fast_and<(b, true)...>>
10 { };
11 }
12
13 template <typename ...Xn>
14 struct tuple {
15 tuple() { }
16
17 template <typename ...Yn, typename = typename std::enable_if<
18 detail::fast_and<std::is_constructible<Xn, Yn&&>::value...>::value
19 >::type>
20 tuple(Yn&& ...yn) { }
21
22 template <typename ...Yn, typename = typename std::enable_if<
23 detail::fast_and<std::is_constructible<Xn, Yn const&>::value...>::value
24 >::type>
25 tuple(tuple<Yn...> const& other) { }
26 };
27
28 tuple<tuple<>> t{};
29 tuple<tuple<>> copy = t;