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Correctly implement LWG 2049; std::is_destructible. 

llvm-svn: 213163
This commit is contained in:
Marshall Clow 2014-07-16 15:51:50 +00:00
parent 7f3e11e7c0
commit f52c88f015
5 changed files with 114 additions and 38 deletions
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64
libcxx/include/type_traits
View File

@ -1537,42 +1537,56 @@ template <class _Tp> struct _LIBCPP_TYPE_VIS_ONLY is_move_assignable
// is_destructible
template <class _Tp>
struct __destructible_test
{
_Tp __t;
};
// if it's a reference, return true
// if it's a function, return false
// if it's void, return false
// if it's an array of unknown bound, return false
// Otherwise, return "std::declval<_Up&>().~_Up()" is well-formed
// where _Up is remove_all_extents<_Tp>::type
template <typename _Tp>
struct __is_destructor_wellformed {
template <typename _Tp1, typename _Tp2 = decltype(_VSTD::declval<_Tp1&>().~_Tp1())>
static char __test (int);
template <typename _Tp1>
static __two __test (...);
static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char);
};
template <class _Tp, bool>
struct __destructible_imp;
template <class _Tp>
decltype((_VSTD::declval<__destructible_test<_Tp> >().~__destructible_test<_Tp>(), true_type()))
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
__is_destructible_test(_Tp&&);
#else
__is_destructible_test(_Tp&);
#endif
false_type
__is_destructible_test(__any);
template <class _Tp, bool = is_void<_Tp>::value || is_abstract<_Tp>::value
|| is_function<_Tp>::value>
struct __destructible_imp
: public common_type
<
decltype(__is_destructible_test(declval<_Tp>()))
>::type {};
struct __destructible_imp<_Tp, false>
: public _VSTD::integral_constant<bool,
__is_destructor_wellformed<typename _VSTD::remove_all_extents<_Tp>::type>::value> {};
template <class _Tp>
struct __destructible_imp<_Tp, true>
: public false_type {};
: public _VSTD::true_type {};
template <class _Tp, bool>
struct __destructible_false;
template <class _Tp>
struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, _VSTD::is_reference<_Tp>::value> {};
template <class _Tp>
struct __destructible_false<_Tp, true> : public _VSTD::false_type {};
template <class _Tp>
struct is_destructible
: public __destructible_imp<_Tp> {};
: public __destructible_false<_Tp, _VSTD::is_function<_Tp>::value> {};
template <class _Tp>
struct is_destructible<_Tp[]>
: public false_type {};
: public _VSTD::false_type {};
template <>
struct is_destructible<void>
: public _VSTD::false_type {};
// move

12
libcxx/test/utilities/meta/meta.unary/meta.unary.prop/is_constructible.pass.cpp
View File

@ -24,6 +24,16 @@ private:
A(char);
};
class Abstract
{
virtual void foo() = 0;
};
class AbstractDestructor
{
virtual ~AbstractDestructor() = 0;
};
template <class T>
void test_is_constructible()
{
@ -71,4 +81,6 @@ int main()
test_is_not_constructible<A, void> ();
test_is_not_constructible<void> ();
test_is_not_constructible<int&> ();
test_is_not_constructible<Abstract> ();
test_is_not_constructible<AbstractDestructor> ();
}

56
libcxx/test/utilities/meta/meta.unary/meta.unary.prop/is_destructible.pass.cpp
View File

@ -31,9 +31,7 @@ void test_is_not_destructible()
static_assert(!std::is_destructible<const volatile T>::value, "");
}
class Empty
{
};
class Empty {};
class NotEmpty
{
@ -47,11 +45,6 @@ struct bit_zero
int : 0;
};
class Abstract
{
virtual ~Abstract() = 0;
};
struct A
{
~A();
@ -59,6 +52,31 @@ struct A
typedef void (Function) ();
struct PublicAbstract { public: virtual void foo() = 0; };
struct ProtectedAbstract { protected: virtual void foo() = 0; };
struct PrivateAbstract { private: virtual void foo() = 0; };
struct PublicDestructor { public: ~PublicDestructor() {}};
struct ProtectedDestructor { protected: ~ProtectedDestructor() {}};
struct PrivateDestructor { private: ~PrivateDestructor() {}};
struct VirtualPublicDestructor { public: virtual ~VirtualPublicDestructor() {}};
struct VirtualProtectedDestructor { protected: virtual ~VirtualProtectedDestructor() {}};
struct VirtualPrivateDestructor { private: virtual ~VirtualPrivateDestructor() {}};
struct PurePublicDestructor { public: virtual ~PurePublicDestructor() = 0; };
struct PureProtectedDestructor { protected: virtual ~PureProtectedDestructor() = 0; };
struct PurePrivateDestructor { private: virtual ~PurePrivateDestructor() = 0; };
struct DeletedPublicDestructor { public: ~DeletedPublicDestructor() = delete; };
struct DeletedProtectedDestructor { protected: ~DeletedProtectedDestructor() = delete; };
struct DeletedPrivateDestructor { private: ~DeletedPrivateDestructor() = delete; };
struct DeletedVirtualPublicDestructor { public: virtual ~DeletedVirtualPublicDestructor() = delete; };
struct DeletedVirtualProtectedDestructor { protected: virtual ~DeletedVirtualProtectedDestructor() = delete; };
struct DeletedVirtualPrivateDestructor { private: virtual ~DeletedVirtualPrivateDestructor() = delete; };
int main()
{
test_is_destructible<A>();
@ -72,10 +90,30 @@ int main()
test_is_destructible<char[3]>();
test_is_destructible<bit_zero>();
test_is_destructible<int[3]>();
test_is_destructible<ProtectedAbstract>();
test_is_destructible<PublicAbstract>();
test_is_destructible<PrivateAbstract>();
test_is_destructible<PublicDestructor>();
test_is_destructible<VirtualPublicDestructor>();
test_is_destructible<PurePublicDestructor>();
test_is_not_destructible<int[]>();
test_is_not_destructible<void>();
test_is_not_destructible<Abstract>();
test_is_not_destructible<ProtectedDestructor>();
test_is_not_destructible<PrivateDestructor>();
test_is_not_destructible<VirtualProtectedDestructor>();
test_is_not_destructible<VirtualPrivateDestructor>();
test_is_not_destructible<PureProtectedDestructor>();
test_is_not_destructible<PurePrivateDestructor>();
test_is_not_destructible<DeletedPublicDestructor>();
test_is_not_destructible<DeletedProtectedDestructor>();
test_is_not_destructible<DeletedPrivateDestructor>();
// test_is_not_destructible<DeletedVirtualPublicDestructor>(); // currently fails due to clang bug #20268
test_is_not_destructible<DeletedVirtualProtectedDestructor>();
test_is_not_destructible<DeletedVirtualPrivateDestructor>();
#if __has_feature(cxx_access_control_sfinae)
test_is_not_destructible<NotEmpty>();
#endif

10
libcxx/test/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_destructible.pass.cpp
View File

@ -49,7 +49,12 @@ struct bit_zero
class Abstract
{
virtual ~Abstract() = 0;
virtual void foo() = 0;
};
class AbstractDestructor
{
virtual ~AbstractDestructor() = 0;
};
struct A
@ -60,7 +65,7 @@ struct A
int main()
{
test_has_not_nothrow_destructor<void>();
test_has_not_nothrow_destructor<Abstract>();
test_has_not_nothrow_destructor<AbstractDestructor>();
test_has_not_nothrow_destructor<NotEmpty>();
#if __has_feature(cxx_noexcept)
@ -79,6 +84,7 @@ int main()
test_is_nothrow_destructible<const int*>();
test_is_nothrow_destructible<char[3]>();
test_is_nothrow_destructible<char[3]>();
test_is_nothrow_destructible<Abstract>();
#if __has_feature(cxx_noexcept)
test_is_nothrow_destructible<bit_zero>();
#endif

10
libcxx/test/utilities/meta/meta.unary/meta.unary.prop/is_trivially_destructible.pass.cpp
View File

@ -49,7 +49,12 @@ struct bit_zero
class Abstract
{
virtual ~Abstract() = 0;
virtual void foo() = 0;
};
class AbstractDestructor
{
virtual ~AbstractDestructor() = 0;
};
struct A
@ -61,9 +66,10 @@ int main()
{
test_has_not_trivial_destructor<void>();
test_has_not_trivial_destructor<A>();
test_has_not_trivial_destructor<Abstract>();
test_has_not_trivial_destructor<AbstractDestructor>();
test_has_not_trivial_destructor<NotEmpty>();
test_is_trivially_destructible<Abstract>();
test_is_trivially_destructible<int&>();
test_is_trivially_destructible<Union>();
test_is_trivially_destructible<Empty>();