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annotate 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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145
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1 // PR c++/80471
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2 // { dg-do compile { target c++14 } }
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3 // { dg-additional-options "-fconcepts" }
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4
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5 template <class, class>
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6 constexpr bool is_same = false;
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7 template <class T>
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8 constexpr bool is_same<T, T> = true;
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9
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10 template<class T>
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11 decltype(auto) f(T&& a){return a;}
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12
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13 decltype(auto) g(auto&& a){return a;}
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14
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15 auto z = [](auto&& a) -> decltype(auto) { return a; };
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16
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17 int main()
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18 {
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19 int i;
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20 static_assert(is_same< decltype(f(i)), int& >, "");
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21 static_assert(is_same< decltype(g(i)), int& >, "");
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22 static_assert(is_same< decltype(z(i)), int& >, "");
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23 }