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145
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1 // { dg-do compile { target c++17_only } }
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131
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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 C1()
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6 {
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145
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7 return requires (T t) { t.f(); }; // { dg-message "in requirements" }
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111
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8 }
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9
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10 template<typename T>
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11 concept bool C2()
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12 {
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145
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13 return requires { typename T::type; }; // { dg-message "in requirements" }
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111
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14 }
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15
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16 template<typename T>
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17 requires C1<T>()
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18 void f1(T x) { }
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19
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20 template<typename T>
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21 requires C2<T>()
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22 void f2(T x) { }
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23
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24 // Note that these declarations are private and therefore
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145
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25 // cannot satisfy the constraints.
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111
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26 class S
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27 {
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28 using type = int;
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29 void f() { }
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30 } s;
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31
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32 int main()
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33 {
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145
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34 f1(s); // { dg-error "unsatisfied|private" }
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111
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35 f2(s); // { dg-error "" }
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36
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37 // When used in non-SFINAE contexts, make sure that we fail
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38 // the constraint check before emitting the access check
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145
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39 // failures. The context is being presented consistently
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111
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40 // in both cases.
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41 static_assert(C1<S>(), ""); // { dg-error "failed" }
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42 static_assert(C2<S>(), ""); // { dg-error "" }
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43 }
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