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111
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1 // { dg-do compile { target c++11 } }
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2
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3 #define ONE
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4 #define TWO
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5 #define THREE
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6
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7 struct Something {};
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8 Something ___;
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9
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10 template <class F>
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11 struct Trial
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12 {
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13 F f;
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14 public:
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15 Trial() : f() {}
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16 Trial( const F& ff ) : f(ff) { }
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17 template <typename... Args>
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18 struct Sig { typedef int ResultType; };
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19
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20 template <typename... Args>
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21 struct Sig<Something,Args...> { typedef int ResultType; };
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22
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23 #ifdef ONE
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24
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25 template <typename... Args>
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26 typename Sig<Something,Args...>::ResultType operator()(const Something& s, const Args&... args) const
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27 {
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28 return f(args...);
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29 }
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30 #endif
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31 #ifdef TWO
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32 template <typename... Args>
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33 typename Sig<Args...>::ResultType operator()(const Args&... args) const
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34 {
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35 return f(args...);
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36 }
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37 #endif
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38 };
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39
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40 struct Internal
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41 {
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42
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43 template <typename... Args>
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44 struct Sig { typedef int ResultType; };
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45
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46 template <typename... Args>
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47 struct Sig<Something,Args...> { typedef int ResultType; };
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48
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49 template <typename... Args>
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50 int operator()(const Args&... args) const
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51 {
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52 int n = sizeof...(Args);
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53 return n;
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54 }
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55
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56 static Trial<Internal>& full() { static Trial<Internal> f; return f; }
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57 };
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58
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59 static Trial<Internal>& internal = Internal::full();
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60
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61 int main()
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62 {
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63 int n = 0;
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64 #ifdef ONE
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65 n = internal(___,1,2);
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66 #endif
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67 #ifdef THREE
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68 n = internal(___,1,2,3);
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69 n = internal(___,1,2,3,4);
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70 #endif
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71 return 0;
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72 }
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