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131
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1 // { dg-do compile { target c++17 } }
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2 // { dg-options "-fconcepts" }
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111
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3
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4 template<typename T>
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5 concept bool Class() { return __is_class(T); }
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6
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7 template<typename T>
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8 concept bool Union() { return __is_union(T); }
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9
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10 // Check non-overlapping specializations
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11 template<typename T> struct S1 { static const int value = 0; };
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12 template<Class T> struct S1<T> { static const int value = 1; };
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13 template<Union T> struct S1<T> { static const int value = 2; };
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14
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15 struct S { };
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16 union U { };
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17
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18 static_assert(S1<int>::value == 0, "");
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19 static_assert(S1<S>::value == 1, "");
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20 static_assert(S1<U>::value == 2, "");
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21
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22 int main() { }
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