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111
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1 // { dg-do run { target c++11 } }
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2 // { dg-additional-options "-O2" }
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3
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4 #include <cassert>
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5
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6 void *
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7 operator new (decltype (sizeof (0)), void *p)
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8 {
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9 return p;
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10 }
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11
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12 namespace std
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13 {
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14 template <typename T>
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15 T *
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16 launder (T *p)
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17 {
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18 return __builtin_launder (p);
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19 }
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20 }
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21
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22 struct A
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23 {
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24 int& x;
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25 };
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26
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27 struct B
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28 {
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29 A a;
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30 };
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31
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32 int
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33 main ()
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34 {
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35 int x = 42;
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36 B b{{x}};
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37 int y = 666;
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38 new (&b.a) A{y};
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39 assert(std::launder(&b.a)->x == 666);
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40 }
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