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1 // PR c++/71105
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2 // { dg-do compile { target c++14 } }
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3
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4 template <typename T> T declval();
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5 template <typename, typename> struct is_same
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6 { static constexpr bool value = false; };
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7 template <typename T> struct is_same<T, T>
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8 { static constexpr bool value = true; };
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9
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10 template <class F>
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11 struct indirected : F {
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12 indirected(F f) : F(f) {}
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13 template <class I>
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14 auto operator()(I i) -> decltype(declval<F&>()(*i)) {
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15 return static_cast<F&>(*this)(*i);
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16 }
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17 };
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18
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19 int main() {
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20 auto f = [=](auto i) { return i + i; };
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21 auto i = indirected<decltype(f)>{f};
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22 static_assert(is_same<decltype(i(declval<int*>())), int>::value, "");
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23 }
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