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131
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1 // PR c++/86981
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2 // { dg-do compile { target c++11 } }
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3 // { dg-options "-Wpessimizing-move" }
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4
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5 // Define std::move.
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6 namespace std {
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7 template<typename _Tp>
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8 struct remove_reference
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9 { typedef _Tp type; };
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10
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11 template<typename _Tp>
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12 struct remove_reference<_Tp&>
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13 { typedef _Tp type; };
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14
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15 template<typename _Tp>
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16 struct remove_reference<_Tp&&>
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17 { typedef _Tp type; };
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18
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19 template<typename _Tp>
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20 constexpr typename std::remove_reference<_Tp>::type&&
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21 move(_Tp&& __t) noexcept
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22 { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); }
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23 }
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24
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25 struct T { };
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26 struct U { U(T); };
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27
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28 template<typename Tp>
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29 T
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30 fn1 ()
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31 {
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32 T t;
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33 // Non-dependent type.
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34 return std::move (t); // { dg-warning "moving a local object in a return statement prevents copy elision" }
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35 }
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36
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37 template<typename Tp1, typename Tp2>
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38 Tp1
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39 fn2 ()
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40 {
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41 Tp2 t;
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42 return std::move (t); // { dg-warning "moving a local object in a return statement prevents copy elision" }
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43 }
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44
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45 template<typename Tp1, typename Tp2>
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46 Tp1
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47 fn3 ()
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48 {
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49 Tp2 t;
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50 return std::move (t);
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51 }
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52
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53 int
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54 main ()
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55 {
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56 fn1<T>();
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57 fn2<T, T>();
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58 fn3<U, T>();
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59 }
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