+2015-08-08 Ville Voutilainen <ville.voutilainen@gmail.com>
+
+ Implement N4089 Safe conversions in unique_ptr<T[]> (LWG 2118)
+ and N4366 LWG 2228: Missing SFINAE rule in unique_ptr
+ templated assignment
+ * include/bits/unique_ptr.h
+ (__remove_cv, __is_derived_Tp): Remove.
+ (default_delete::default_delete(const default_delete<_Up[]>)):
+ Constrain with array convertibility.
+ (default_delete::operator(_Up*)): Turn into a template,
+ constrain with array convertibility.
+ (__safe_conversion_up): New, single object version.
+ (unique_ptr(unique_ptr<_Up, _Ep>&&)): Constrain with deleter
+ convertibility.
+ (unique_ptr::operator=(unique_ptr<_Up, _Ep>&&)): Likewise, and add
+ is_assignable as a constraint.
+ (__safe_conversion_up): Array version, renamed from __safe_conversion,
+ updated to implement N4089.
+ (__safe_conversion_raw): New.
+ (unique_ptr(_Up)): Turn into a template, constrain with array
+ convertibility.
+ (unique_ptr(_Up,
+ typename conditional<is_reference<deleter_type>::value,
+ deleter_type, const deleter_type&>::type)): Likewise.
+ (unique_ptr(_Up, typename
+ remove_reference<deleter_type>::type&&)): Likewise.
+ (unique_ptr(unique_ptr<_Up, _Ep>&&)): Likewise.
+ (operator=(unique_ptr<_Up, _Ep>&&)): Likewise, and add
+ is_assignable as a constraint (array version).
+ (reset(_Up)): Turn into a template, constrain with array
+ convertibility.
+ (reset(nullptr_t)): New.
+ * testsuite/20_util/default_delete/48631_neg.cc: Adjust.
+ * testsuite/20_util/unique_ptr/assign/48635.cc: Likewise.
+ * testsuite/20_util/unique_ptr/assign/48635_neg.cc: Likewise.
+ * testsuite/20_util/unique_ptr/assign/cv_qual.cc: Likewise.
+ * testsuite/20_util/unique_ptr/cons/cv_qual.cc: Likewise.
+ * testsuite/20_util/unique_ptr/dr2228.cc: New.
+ * testsuite/20_util/unique_ptr/modifiers/cv_qual.cc: Adjust.
+
2015-08-05 Nikolai Bozhenov <n.bozhenov@samsung.com>
* testsuite/20_util/enable_shared_from_this/cons/constexpr.cc: Remove
template<typename _Tp>
struct default_delete<_Tp[]>
{
- private:
- template<typename _Up>
- using __remove_cv = typename remove_cv<_Up>::type;
-
- // Like is_base_of<_Tp, _Up> but false if unqualified types are the same
- template<typename _Up>
- using __is_derived_Tp
- = __and_< is_base_of<_Tp, _Up>,
- __not_<is_same<__remove_cv<_Tp>, __remove_cv<_Up>>> >;
-
public:
/// Default constructor
constexpr default_delete() noexcept = default;
* pointer to the base type.
*/
template<typename _Up, typename = typename
- enable_if<!__is_derived_Tp<_Up>::value>::type>
+ enable_if<is_convertible<_Up(*)[], _Tp(*)[]>::value>::type>
default_delete(const default_delete<_Up[]>&) noexcept { }
/// Calls @c delete[] @p __ptr
- void
- operator()(_Tp* __ptr) const
+ template<typename _Up>
+ typename enable_if<is_convertible<_Up(*)[], _Tp(*)[]>::value>::type
+ operator()(_Up* __ptr) const
{
static_assert(sizeof(_Tp)>0,
"can't delete pointer to incomplete type");
delete [] __ptr;
}
-
- template<typename _Up>
- typename enable_if<__is_derived_Tp<_Up>::value>::type
- operator()(_Up*) const = delete;
};
/// 20.7.1.2 unique_ptr for single objects.
typedef _Tp element_type;
typedef _Dp deleter_type;
+
+ // helper template for detecting a safe conversion from another
+ // unique_ptr
+ template<typename _Up, typename _Ep>
+ using __safe_conversion_up = __and_<
+ is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>,
+ __not_<is_array<_Up>>,
+ __or_<__and_<is_reference<deleter_type>,
+ is_same<deleter_type, _Ep>>,
+ __and_<__not_<is_reference<deleter_type>>,
+ is_convertible<_Ep, deleter_type>>
+ >
+ >;
+
// Constructors.
/// Default constructor, creates a unique_ptr that owns nothing.
* and @p __u has a compatible deleter type.
*/
template<typename _Up, typename _Ep, typename = _Require<
- is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>,
- __not_<is_array<_Up>>,
+ __safe_conversion_up<_Up, _Ep>,
typename conditional<is_reference<_Dp>::value,
is_same<_Ep, _Dp>,
is_convertible<_Ep, _Dp>>::type>>
* Invokes the deleter first if this object owns a pointer.
*/
template<typename _Up, typename _Ep>
- typename enable_if< __and_<
- is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>,
- __not_<is_array<_Up>>
- >::value,
- unique_ptr&>::type
+ typename enable_if< __and_<
+ __safe_conversion_up<_Up, _Ep>,
+ is_assignable<deleter_type&, _Ep&&>
+ >::value,
+ unique_ptr&>::type
operator=(unique_ptr<_Up, _Ep>&& __u) noexcept
{
reset(__u.release());
= __and_< is_base_of<_Tp, _Up>,
__not_<is_same<__remove_cv<_Tp>, __remove_cv<_Up>>> >;
- template<typename _Up, typename _Ep,
- typename _Tp_pointer = typename _Pointer::type,
- typename _Up_pointer = typename unique_ptr<_Up, _Ep>::pointer>
- using __safe_conversion = __and_<
- is_convertible<_Up_pointer, _Tp_pointer>,
- is_array<_Up>,
- __or_<__not_<is_pointer<_Up_pointer>>,
- __not_<is_pointer<_Tp_pointer>>,
- __not_<__is_derived_Tp<typename remove_extent<_Up>::type>>
- >
- >;
public:
typedef typename _Pointer::type pointer;
typedef _Tp element_type;
typedef _Dp deleter_type;
+ // helper template for detecting a safe conversion from another
+ // unique_ptr
+ template<typename _Up, typename _Ep,
+ typename _Up_up = unique_ptr<_Up, _Ep>,
+ typename _Up_element_type = typename _Up_up::element_type>
+ using __safe_conversion_up = __and_<
+ is_array<_Up>,
+ is_same<pointer, element_type*>,
+ is_same<typename _Up_up::pointer, _Up_element_type*>,
+ is_convertible<_Up_element_type(*)[], element_type(*)[]>,
+ __or_<__and_<is_reference<deleter_type>, is_same<deleter_type, _Ep>>,
+ __and_<__not_<is_reference<deleter_type>>,
+ is_convertible<_Ep, deleter_type>>>
+ >;
+
+ // helper template for detecting a safe conversion from a raw pointer
+ template<typename _Up>
+ using __safe_conversion_raw = __and_<
+ __or_<__or_<is_same<_Up, pointer>,
+ is_same<_Up, nullptr_t>>,
+ __and_<is_pointer<_Up>,
+ is_same<pointer, element_type*>,
+ is_convertible<
+ typename remove_pointer<_Up>::type(*)[],
+ element_type(*)[]>
+ >
+ >
+ >;
+
// Constructors.
/// Default constructor, creates a unique_ptr that owns nothing.
/** Takes ownership of a pointer.
*
- * @param __p A pointer to an array of @c element_type
+ * @param __p A pointer to an array of a type safely convertible
+ * to an array of @c element_type
*
* The deleter will be value-initialized.
*/
+ template<typename _Up,
+ typename = typename enable_if<
+ __safe_conversion_raw<_Up>::value, bool>::type>
explicit
- unique_ptr(pointer __p) noexcept
+ unique_ptr(_Up __p) noexcept
: _M_t(__p, deleter_type())
{ static_assert(!is_pointer<deleter_type>::value,
"constructed with null function pointer deleter"); }
- // Disable construction from convertible pointer types.
- template<typename _Up, typename = _Require<is_pointer<pointer>,
- is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>>
- explicit
- unique_ptr(_Up* __p) = delete;
-
/** Takes ownership of a pointer.
*
- * @param __p A pointer to an array of @c element_type
+ * @param __p A pointer to an array of a type safely convertible
+ * to an array of @c element_type
* @param __d A reference to a deleter.
*
* The deleter will be initialized with @p __d
*/
- unique_ptr(pointer __p,
- typename conditional<is_reference<deleter_type>::value,
- deleter_type, const deleter_type&>::type __d) noexcept
+ template<typename _Up,
+ typename = typename enable_if<
+ __safe_conversion_raw<_Up>::value, bool>::type>
+ unique_ptr(_Up __p,
+ typename conditional<is_reference<deleter_type>::value,
+ deleter_type, const deleter_type&>::type __d) noexcept
: _M_t(__p, __d) { }
/** Takes ownership of a pointer.
*
- * @param __p A pointer to an array of @c element_type
+ * @param __p A pointer to an array of a type safely convertible
+ * to an array of @c element_type
* @param __d A reference to a deleter.
*
* The deleter will be initialized with @p std::move(__d)
*/
- unique_ptr(pointer __p, typename
+ template<typename _Up,
+ typename = typename enable_if<
+ __safe_conversion_raw<_Up>::value, bool>::type>
+ unique_ptr(_Up __p, typename
remove_reference<deleter_type>::type&& __d) noexcept
: _M_t(std::move(__p), std::move(__d))
{ static_assert(!is_reference<deleter_type>::value,
constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
template<typename _Up, typename _Ep,
- typename = _Require<__safe_conversion<_Up, _Ep>,
- typename conditional<is_reference<_Dp>::value,
- is_same<_Ep, _Dp>,
- is_convertible<_Ep, _Dp>>::type
- >>
+ typename = _Require<__safe_conversion_up<_Up, _Ep>>>
unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept
: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
{ }
*/
template<typename _Up, typename _Ep>
typename
- enable_if<__safe_conversion<_Up, _Ep>::value, unique_ptr&>::type
+ enable_if<__and_<__safe_conversion_up<_Up, _Ep>,
+ is_assignable<deleter_type&, _Ep&&>
+ >::value,
+ unique_ptr&>::type
operator=(unique_ptr<_Up, _Ep>&& __u) noexcept
{
reset(__u.release());
*
* The deleter will be invoked if a pointer is already owned.
*/
+ template <typename _Up,
+ typename = _Require<
+ __or_<is_same<_Up, pointer>,
+ __and_<is_same<pointer, element_type*>,
+ is_pointer<_Up>,
+ is_convertible<
+ typename remove_pointer<_Up>::type(*)[],
+ element_type(*)[]
+ >
+ >
+ >
+ >>
void
- reset(pointer __p = pointer()) noexcept
+ reset(_Up __p) noexcept
{
using std::swap;
swap(std::get<0>(_M_t), __p);
get_deleter()(__p);
}
- // Disable resetting from convertible pointer types.
- template<typename _Up, typename = _Require<is_pointer<pointer>,
- is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>>
- void reset(_Up*) = delete;
+ void reset(nullptr_t = nullptr) noexcept
+ {
+ reset(pointer());
+ }
/// Exchange the pointer and deleter with another object.
void
// Disable copy from lvalue.
unique_ptr(const unique_ptr&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
-
- // Disable construction from convertible pointer types.
- template<typename _Up, typename = _Require<is_pointer<pointer>,
- is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>>
- unique_ptr(_Up*, typename
- conditional<is_reference<deleter_type>::value,
- deleter_type, const deleter_type&>::type) = delete;
-
- // Disable construction from convertible pointer types.
- template<typename _Up, typename = _Require<is_pointer<pointer>,
- is_convertible<_Up*, pointer>, __is_derived_Tp<_Up>>>
- unique_ptr(_Up*, typename
- remove_reference<deleter_type>::type&&) = delete;
};
template<typename _Tp, typename _Dp>
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