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comparison gcc/testsuite/g++.dg/cpp1y/lambda-conv2.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++/71105
2 // { dg-do compile { target c++14 } }
3
4 template <typename T> T declval();
5 template <typename, typename> struct is_same
6 { static constexpr bool value = false; };
7 template <typename T> struct is_same<T, T>
8 { static constexpr bool value = true; };
9
10 template <class F>
11 struct indirected : F {
12 indirected(F f) : F(f) {}
13 template <class I>
14 auto operator()(I i) -> decltype(declval<F&>()(*i)) {
15 return static_cast<F&>(*this)(*i);
16 }
17 };
18
19 int main() {
20 auto f = [=](auto i) { return i + i; };
21 auto i = indirected<decltype(f)>{f};
22 static_assert(is_same<decltype(i(declval<int*>())), int>::value, "");
23 }