Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp0x/initlist-explicit-sfinae.C @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
---|---|
date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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// { dg-do compile { target c++11 } } template<typename _Tp> _Tp&& declval() noexcept; template<bool b> struct bt { static constexpr bool value = b; }; template <typename To_, typename... From_> class my_is_convertible_many { private: template <typename To> struct indirector { indirector(To); }; template <typename To, typename... From> struct tag {}; template <typename To, typename... From> static auto test(tag<To, From...>) -> decltype(indirector<To>({declval<From>()...}), bt<true>()); static auto test(...) -> bt<false>; public: static constexpr bool value = decltype(test(tag<To_, From_...>()))::value; }; struct A {}; struct B {}; struct C {}; struct Test { Test(A, A); //Test(B, B); explicit Test(C, C); }; int main() { static_assert(my_is_convertible_many<Test, A, A>::value,""); // true, correct static_assert(!my_is_convertible_many<Test, B, B>::value,""); // false, correct static_assert(!my_is_convertible_many<Test, C, C>::value,""); // error return 0; }