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comparison gcc/testsuite/g++.dg/cpp2a/concepts-pr80471.C @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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131:84e7813d76e9 145:1830386684a0
1 // PR c++/80471
2 // { dg-do compile { target c++14 } }
3 // { dg-additional-options "-fconcepts" }
4
5 template <class, class>
6 constexpr bool is_same = false;
7 template <class T>
8 constexpr bool is_same<T, T> = true;
9
10 template<class T>
11 decltype(auto) f(T&& a){return a;}
12
13 decltype(auto) g(auto&& a){return a;}
14
15 auto z = [](auto&& a) -> decltype(auto) { return a; };
16
17 int main()
18 {
19 int i;
20 static_assert(is_same< decltype(f(i)), int& >, "");
21 static_assert(is_same< decltype(g(i)), int& >, "");
22 static_assert(is_same< decltype(z(i)), int& >, "");
23 }