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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 #include <cassert>
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5
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6 template<typename T>
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7 concept bool Class() { return __is_class(T); }
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8
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9 template<typename T>
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10 concept bool Empty() { return Class<T>() and __is_empty(T); }
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11
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12 template<Class T> int f(T) { return 1; }
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13 template<Empty T> int f(T) { return 2; }
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14
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15 struct S {
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16 template<Class T> int f(T) { return 1; }
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17 template<Empty T> int f(T) { return 2; }
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18 } s;
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19
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20 struct X { } x;
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21 struct Y { X x; } y;
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22
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23 int main () {
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24 auto p1 = &f<X>; // Empty f
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25 assert(p1(x) == 2);
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26
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27 auto p2 = &f<Y>; // Class f
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28 assert(p2(y) == 1);
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29
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30 auto p3 = &S::template f<X>; // Empty f
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31 assert((s.*p3)(x) == 2);
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32
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33 auto p4 = &S::template f<Y>; // Empty f
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34 assert((s.*p4)(y) == 1);
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35 }
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