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annotate gcc/testsuite/g++.dg/concepts/req16.C @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children
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1 // PR c++/66988
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2 // { dg-do compile { target c++17 } }
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3 // { dg-options "-fconcepts" }
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5 #include <type_traits>
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6
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7 template <template <class> class T, class U>
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8 concept bool _Valid = requires { typename T<U>; };
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9
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10 template <class T>
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11 using __t = typename T::type;
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12
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13 template <class T>
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14 struct __has_type : std::false_type { };
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15
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16 template <class T>
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17 requires _Valid<__t, T>
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18 struct __has_type<T> : std::true_type { };
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19
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20 static_assert(!__has_type<int>(), "");