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1 // PR c++/44969
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2
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3 template<bool, typename T = void> struct enable_if { typedef T type; };
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4 template<typename T> struct enable_if<false, T> { };
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5
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6 template<typename Tp, typename Arg1, typename Arg2>
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7 class mini_is_constructible
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8 {
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9 typedef char one;
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10 typedef struct { char arr[2]; } two;
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11
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12 template<typename Tp1, typename Arg1_, typename Arg2_>
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13 static typename
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14 enable_if<(sizeof(Tp1(Arg1_(), Arg2_()), 1) > 0), one>::type
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15 test(int);
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16
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17 template<typename, typename, typename>
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18 static two test(...);
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19
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20 public:
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21 static const bool value = sizeof(test<Tp, Arg1, Arg2>(0)) == 1;
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22 };
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23
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24 class A { };
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25
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26 int Test[mini_is_constructible<int, A, A>::value ? -1 : 1];
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