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view gcc/testsuite/g++.dg/cpp1y/lambda-generic-conv2.C @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
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// PR c++/71117 // { dg-do compile { target c++14 } } template <class T> T&& declval() noexcept; template <class, class> constexpr bool is_same = false; template <class T> constexpr bool is_same<T, T> = true; template <class F> struct indirected : F { indirected(F f) : F(f) {} template <class I> auto operator()(I i) -> decltype(declval<F&>()(*i)) { return static_cast<F&>(*this)(*i); } }; int main() { auto f = [](auto rng) { static_assert(is_same<decltype(rng), int>, ""); return 42; }; indirected<decltype(f)> i(f); static_assert(is_same<decltype(i(declval<int*>())), int>, ""); }