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111
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1 // PR c++/49107
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2 // { dg-do compile { target c++11 } }
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3
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4 template<typename _Tp>
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5 _Tp declval() noexcept;
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6
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7 template<typename _Tp , typename = decltype(_Tp(declval<_Tp&&>()))>
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8 struct trait
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9 {
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10 static const bool value=true;
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11 };
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12
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13 template<class _T2>
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14 struct pair
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15 {
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16 _T2 second;
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17 void swap(pair& __p)
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18 noexcept(trait<_T2>::value);
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19 };
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20
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21 template < class R_ >
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22 struct Main
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23 {
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24 Main() {}
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25 Main(const typename R_::Sub1T& r) ;
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26 Main(const typename R_::Sub2T& l) ;
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27 };
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28
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29 template < class R_ >
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30 class Sub1
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31 {
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32 typedef pair<typename R_::MainT> Rep;
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33 Rep base;
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34 };
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35
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36 template < class R_ >
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37 struct Sub2
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38 {
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39 typedef pair<typename R_::MainT> Rep;
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40 Rep base;
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41 };
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42
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43 struct Kernel
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44 {
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45 typedef Main<Kernel> MainT;
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46 typedef Sub1<Kernel> Sub1T;
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47 typedef Sub2<Kernel> Sub2T;
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48 };
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49
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50 Main<Kernel> f()
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51 {
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52 return Main<Kernel> ();
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53 }
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