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131
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1 // { dg-do run { 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 #include <cassert>
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5
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6 template<typename T>
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7 concept bool C() { return __is_class(T); }
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8
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9 template<typename T>
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10 concept bool D() { return C<T>() && __is_empty(T); }
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11
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12 struct X { } x;
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13 struct Y { int n; } y;
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14
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15 int called = 0;
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16
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17 template<typename T>
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18 struct S {
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19 void f() { called = 0; } // #1
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20 void f() requires C<T>() { called = 0; } // #2
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21
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22 void g() requires C<T>() { } // #1
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23 void g() requires D<T>() { } // #2
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24 };
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25
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26 template<> void S<int>::f() { called = 1; } // Spec of #1
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27 template<> void S<X>::f() { called = 2; } // Spec of #2
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28
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29 template<> void S<X>::g() { called = 3; } // Spec of #2
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30 template<> void S<Y>::g() { called = 4; } // Spec of #1
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31
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32 int main() {
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33 S<double> sd;
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34 S<int> si;
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35 S<X> sx;
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36 S<Y> sy;
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37
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38 sd.f();
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39 assert(called == 0);
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40 si.f();
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41 assert(called == 1);
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42 sx.f();
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43 assert(called == 2);
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44 sy.f();
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45 assert(called == 0);
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46
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47 sx.g();
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48 assert(called == 3);
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49 sy.g();
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50 assert(called == 4);
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51 }
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