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1 // PR c++/44907
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2 // { dg-do compile { target c++11 } }
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3
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4 #include <utility>
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5
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6 struct A { };
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7
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8 struct B
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9 : public A { };
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10
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11 struct C
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12 : public A { };
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13
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14 struct D
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15 : public B, public C { };
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16
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17 template<typename From, typename To>
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18 class mini_is_convertible
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19 {
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20 typedef char one;
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21 typedef struct { char arr[2]; } two;
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22
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23 template<typename To1>
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24 static void test_aux(To1);
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25
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26 template<typename To1, typename From1>
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27 static decltype(test_aux<To1>(std::declval<From1>()), one())
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28 test(int);
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29
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30 template<typename, typename>
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31 static two test(...);
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32
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33 public:
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34 static const bool value = sizeof(test<To, From>(0)) == 1;
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35 };
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36
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37 template<typename From, typename To>
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38 const bool mini_is_convertible<From, To>::value;
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39
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40 static_assert (!mini_is_convertible<D*, A*>::value, "");
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41 static_assert (!mini_is_convertible<A*, D*>::value, "");
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42 static_assert (!mini_is_convertible<D&, A&>::value, "");
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43 static_assert (!mini_is_convertible<A&, D&>::value, "");
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44 static_assert (!mini_is_convertible<D, A>::value, "");
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45 static_assert (!mini_is_convertible<A, D>::value, "");
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