| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // type_traits |
| |
| // is_assignable |
| |
| #include <type_traits> |
| |
| struct A |
| { |
| }; |
| |
| struct B |
| { |
| void operator=(A); |
| }; |
| |
| template <class T, class U> |
| void test_is_assignable() |
| { |
| static_assert(( std::is_assignable<T, U>::value), ""); |
| } |
| |
| template <class T, class U> |
| void test_is_not_assignable() |
| { |
| static_assert((!std::is_assignable<T, U>::value), ""); |
| } |
| |
| struct D; |
| |
| #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
| struct C |
| { |
| template <class U> |
| D operator,(U&&); |
| }; |
| |
| struct E |
| { |
| C operator=(int); |
| }; |
| #endif |
| |
| int main() |
| { |
| test_is_assignable<int&, int&> (); |
| test_is_assignable<int&, int> (); |
| test_is_assignable<int&, double> (); |
| test_is_assignable<B, A> (); |
| test_is_assignable<void*&, void*> (); |
| |
| #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES |
| test_is_assignable<E, int> (); |
| |
| test_is_not_assignable<int, int&> (); |
| test_is_not_assignable<int, int> (); |
| #endif |
| test_is_not_assignable<A, B> (); |
| test_is_not_assignable<void, const void> (); |
| test_is_not_assignable<const void, const void> (); |
| test_is_not_assignable<int(), int> (); |
| } |