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view gcc/testsuite/g++.dg/cpp0x/lambda/lambda-sfinae1.C @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
children |
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// PR c++/56039 // { dg-do compile { target c++11 } } template <bool> struct BoolSink { typedef void type; }; template <typename T, typename U> struct AddRvalueReferenceImpl { typedef T type; }; template <typename T> struct AddRvalueReferenceImpl<T, typename BoolSink<false && [] { // { dg-error "lambda" "" { target c++17_down } } extern T &&tref; }>::type> { typedef T &&type; }; template <typename T> struct AddRvalueReference : AddRvalueReferenceImpl<T, void> { }; namespace ImplHelpers { template <typename T> typename AddRvalueReference<T>::type create(void); } template <typename T, typename U, typename ...Args> struct IsConstructibleImpl { enum { value = 0 }; }; template <typename T, typename ...Args> struct IsConstructibleImpl<T, typename BoolSink<false && [] { T t( ::ImplHelpers::create<Args>() ...); } // { dg-error "" } >::type, Args ...> { enum { value = 1 }; }; template <typename T, typename ...Args> struct IsConstructible : IsConstructibleImpl<T, void, Args ...> { }; struct DestroyMe { ~DestroyMe() = delete; }; static_assert(+IsConstructible<int>::value, "error"); static_assert(!IsConstructible<void>::value, "error"); static_assert(+IsConstructible<int [1]>::value, "error"); static_assert(!IsConstructible<DestroyMe>::value, "error"); static_assert(!IsConstructible<int *, char *>::value, "error"); static_assert(+IsConstructible<int &&, int>::value, "error"); static_assert(!IsConstructible<int &&, int &>::value, "error"); static_assert(+IsConstructible<int &&, int &&>::value, "error"); // { dg-prune-output "expected" } // { dg-prune-output "does not name a class" } // { dg-prune-output "static assertion" } // { dg-prune-output "template argument . is invalid" }