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author | Jonathan Wakely <jwakely@redhat.com> | 2016-10-19 10:35:03 +0100 |
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committer | Jonathan Wakely <redi@gcc.gnu.org> | 2016-10-19 10:35:03 +0100 |
commit | 84870b6bb2691cc4031b8408b41bbb6583526c0f (patch) | |
tree | dad6bafec631e0e2dc375fc508b4dd431b893529 /libstdc++-v3/include/experimental/bits | |
parent | e182393e31609b0d1474cea18c69bbb6c287ae6b (diff) | |
download | gcc-84870b6bb2691cc4031b8408b41bbb6583526c0f.tar.gz |
Fix std::experimental::shared_ptr SFINAE constraints
* include/experimental/bits/shared_ptr.h
(__shared_ptr<__libfund_v1<_Tp, false>, _Lp>::_Compatible): Just use
is_convertible for non-array specialization.
(__shared_ptr<__libfund_v1<_Tp, false>, _Lp>::_UniqCompatible): New
constraint for conversions from unique_ptr.
(__shared_ptr<__libfund_v1<_Tp, false>, _Lp>::__shared_ptr): Constrain.
(__shared_ptr<__libfund_v1<_Tp, false>, _Lp>::reset): Likewise.
(__sp_compatible_v): New variable template for trait.
(__sp_is_constructible): New trait to check shared_ptr constraints.
(__sp_is_constructible_v): New variable template for trait.
(__shared_ptr<__libfund_v1<_Tp, true>, _Lp>::_SafeConv): New
constraint for construction/reset, using __sp_is_constructible_v.
(__shared_ptr<__libfund_v1<_Tp, true>, _Lp>::_UniqCompatible): New
constraint for conversions from unique_ptr.
(__shared_ptr<__libfund_v1<_Tp, true>, _Lp>::__shared_ptr): Constrain.
(__shared_ptr<__libfund_v1<_Tp, true>, _Lp>::reset): Likewise.
(shared_ptr::_SafeConv): Constraint for checking constructors.
(shared_ptr(Tp1*), shared_ptr(_Tp1, _Deleter))
(shared_ptr(_Tp1, _Deleter, _Alloc)): Constrain with _SafeConv.
(shared_ptr(const weak_ptr<_Tp1>&)): Constrain with _Compatible.
(shared_ptr(auto_ptr<_Tp1>&&)): Fix, remove TODO.
* testsuite/experimental/memory/shared_ptr/cons/pointer_ctor.cc:
Remove tests using invalid conversions.
* testsuite/experimental/memory/shared_ptr/cons/pointer_ctor_neg.cc:
New test.
* testsuite/experimental/memory/shared_ptr/cons/torture.cc: New test.
* testsuite/experimental/memory/shared_ptr/modifiers/reset.cc: Remove
tests using invalid conversions.
* testsuite/experimental/memory/shared_ptr/modifiers/reset_neg.cc: New
test.
* testsuite/experimental/memory/shared_ptr/observers/use_count.cc:
Remove tests using invalid conversions.
From-SVN: r241331
Diffstat (limited to 'libstdc++-v3/include/experimental/bits')
-rw-r--r-- | libstdc++-v3/include/experimental/bits/shared_ptr.h | 281 |
1 files changed, 193 insertions, 88 deletions
diff --git a/libstdc++-v3/include/experimental/bits/shared_ptr.h b/libstdc++-v3/include/experimental/bits/shared_ptr.h index e0ec00c1c67..2e3da62c599 100644 --- a/libstdc++-v3/include/experimental/bits/shared_ptr.h +++ b/libstdc++-v3/include/experimental/bits/shared_ptr.h @@ -69,53 +69,48 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template <typename _Tp, bool = is_array<_Tp>::value> struct __libfund_v1 { using type = _Tp; }; - // helper for _Compatible - template<typename _From_type, typename _To_type> - struct __sp_compatible - : is_convertible<_From_type*, _To_type*>::type - { }; - - template<size_t _Nm, typename _Tp> - struct __sp_compatible<_Tp[_Nm], _Tp[]> - : true_type - { }; - - template<size_t _Nm, typename _Tp> - struct __sp_compatible<_Tp[_Nm], const _Tp[]> - : true_type - { }; - // Partial specialization for base class of experimental::shared_ptr<T> // (i.e. the non-array form of experimental::shared_ptr) template<typename _Tp, _Lock_policy _Lp> class __shared_ptr<__libfund_v1<_Tp, false>, _Lp> : private __shared_ptr<_Tp, _Lp> { - template<typename _Tp1, typename _Res = void> + // For non-arrays, Y* is compatible with T* if Y* is convertible to T*. + template<typename _Yp, typename _Res = void> using _Compatible - = enable_if_t<__sp_compatible<_Tp1, _Tp>::value, _Res>; + = enable_if_t<experimental::is_convertible_v<_Yp*, _Tp*>, _Res>; + + template<typename _Yp, typename _Del, + typename _Ptr = typename unique_ptr<_Yp, _Del>::pointer, + typename _Res = void> + using _UniqCompatible = enable_if_t< + experimental::is_convertible_v<_Yp*, _Tp*> + && experimental::is_convertible_v<_Ptr, _Tp*>, + _Res>; using _Base_type = __shared_ptr<_Tp>; - _Base_type& _M_get_base() { return *this;} - const _Base_type& _M_get_base() const { return *this;} + _Base_type& _M_get_base() { return *this; } + const _Base_type& _M_get_base() const { return *this; } public: using element_type = _Tp; constexpr __shared_ptr() noexcept = default; - template<typename _Tp1> - explicit __shared_ptr(_Tp1* __p) + template<typename _Tp1, typename = _Compatible<_Tp1>> + explicit + __shared_ptr(_Tp1* __p) : _Base_type(__p) { } - template<typename _Tp1, typename _Deleter> + template<typename _Tp1, typename _Deleter, typename = _Compatible<_Tp1>> __shared_ptr(_Tp1* __p, _Deleter __d) : _Base_type(__p, __d) { } - template<typename _Tp1, typename _Deleter, typename _Alloc> + template<typename _Tp1, typename _Deleter, typename _Alloc, + typename = _Compatible<_Tp1>> __shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a) : _Base_type(__p, __d, __a) { } @@ -152,21 +147,21 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION : _Base_type(std::move((__r._M_get_base()))) { } - template<typename _Tp1> - explicit __shared_ptr(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __r) + template<typename _Tp1, typename = _Compatible<_Tp1>> + explicit + __shared_ptr(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __r) : _Base_type(__r._M_get_base()) { } - template<typename _Tp1, typename _Del, typename - = _Compatible<remove_pointer_t< - typename unique_ptr<_Tp1, _Del>::pointer>>> - __shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r) - : _Base_type(std::move(__r)) - { } + template<typename _Tp1, typename _Del, + typename = _UniqCompatible<_Tp1, _Del>> + __shared_ptr(unique_ptr<_Tp1, _Del>&& __r) + : _Base_type(std::move(__r)) + { } #if _GLIBCXX_USE_DEPRECATED // Postcondition: use_count() == 1 and __r.get() == 0 - template<typename _Tp1> + template<typename _Tp1, typename = _Compatible<_Tp1>> __shared_ptr(std::auto_ptr<_Tp1>&& __r) : _Base_type(std::move(__r)) { } @@ -180,7 +175,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { __shared_ptr(nullptr).swap(*this); } template<typename _Tp1> - void + _Compatible<_Tp1> reset(_Tp1* __p) { _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != get()); @@ -188,12 +183,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION } template<typename _Tp1, typename _Deleter> - void + _Compatible<_Tp1> reset(_Tp1* __p, _Deleter __d) { __shared_ptr(__p, __d).swap(*this); } template<typename _Tp1, typename _Deleter, typename _Alloc> - void + _Compatible<_Tp1> reset(_Tp1* __p, _Deleter __d, _Alloc __a) { __shared_ptr(__p, __d, std::move(__a)).swap(*this); } @@ -216,9 +211,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION return *this; } - template<typename _Tp1> - _Compatible<_Tp1, __shared_ptr&> - operator=(std::unique_ptr<_Tp1>&& __r) + template<typename _Tp1, typename _Del> + _UniqCompatible<_Tp1, _Del, __shared_ptr&> + operator=(unique_ptr<_Tp1, _Del>&& __r) { _Base_type::operator=(std::move(__r)); return *this; @@ -282,6 +277,77 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION friend _Del* get_deleter(const __shared_ptr<_Tp1, _Lp1>&) noexcept; }; + // Helper traits for shared_ptr of array: + + // Trait that tests if Y* is compatible with T*, for shared_ptr purposes. + template<typename _Yp, typename _Tp> + struct __sp_compatible + : is_convertible<_Yp*, _Tp*>::type + { }; + + template<size_t _Nm, typename _Tp> + struct __sp_compatible<_Tp[_Nm], _Tp[]> + : true_type + { }; + + template<size_t _Nm, typename _Tp> + struct __sp_compatible<_Tp[_Nm], const _Tp[]> + : true_type + { }; + + template<typename _Yp, typename _Tp> + constexpr bool __sp_compatible_v + = __sp_compatible<_Yp, _Tp>::value; + + // Test conversion from Y(*)[N] to U(*)[N] without forming invalid type Y[N]. + template<typename _Up, size_t _Nm, typename _Yp, typename = void> + struct __sp_is_constructible_arrN + : false_type + { }; + + template<typename _Up, size_t _Nm, typename _Yp> + struct __sp_is_constructible_arrN<_Up, _Nm, _Yp, __void_t<_Yp[_Nm]>> + : is_convertible<_Yp(*)[_Nm], _Up(*)[_Nm]>::type + { }; + + // Test conversion from Y(*)[] to U(*)[] without forming invalid type Y[]. + template<typename _Up, typename _Yp, typename = void> + struct __sp_is_constructible_arr + : false_type + { }; + + template<typename _Up, typename _Yp> + struct __sp_is_constructible_arr<_Up, _Yp, __void_t<_Yp[]>> + : is_convertible<_Yp(*)[], _Up(*)[]>::type + { }; + + // Trait to check if shared_ptr<T> can be constructed from Y*. + template<typename _Tp, typename _Yp> + struct __sp_is_constructible; + + // When T is U[N], Y(*)[N] shall be convertible to T*; + template<typename _Up, size_t _Nm, typename _Yp> + struct __sp_is_constructible<_Up[_Nm], _Yp> + : __sp_is_constructible_arrN<_Up, _Nm, _Yp>::type + { }; + + // when T is U[], Y(*)[] shall be convertible to T*; + template<typename _Up, typename _Yp> + struct __sp_is_constructible<_Up[], _Yp> + : __sp_is_constructible_arr<_Up, _Yp>::type + { }; + + // otherwise, Y* shall be convertible to T*. + template<typename _Tp, typename _Yp> + struct __sp_is_constructible + : is_convertible<_Yp*, _Tp*>::type + { }; + + template<typename _Tp, typename _Yp> + constexpr bool __sp_is_constructible_v + = __sp_is_constructible<_Tp, _Yp>::value; + + // Partial specialization for base class of experimental::shared_ptr<T[N]> // and experimental::shared_ptr<T[]> (i.e. the array forms). template<typename _Tp, _Lock_policy _Lp> @@ -299,31 +365,46 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { delete [] __p; } }; + // Constraint for constructing/resetting with a pointer of type _Yp*: + template<typename _Yp> + using _SafeConv = enable_if_t<__sp_is_constructible_v<_Tp, _Yp>>; + + // Constraint for constructing/assigning from smart_pointer<_Tp1>: template<typename _Tp1, typename _Res = void> - using _Compatible - = enable_if_t<__sp_compatible<_Tp1, _Tp>::value, _Res>; + using _Compatible = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>; + + // Constraint for constructing/assigning from unique_ptr<_Tp1, _Del>: + template<typename _Tp1, typename _Del, + typename _Ptr = typename unique_ptr<_Tp1, _Del>::pointer, + typename _Res = void> + using _UniqCompatible = enable_if_t< + __sp_compatible_v<_Tp1, _Tp> + && experimental::is_convertible_v<_Ptr, element_type*>, + _Res>; using _Base_type = __shared_ptr<element_type>; - _Base_type& _M_get_base() { return *this;} - const _Base_type& _M_get_base() const { return *this;} + _Base_type& _M_get_base() { return *this; } + const _Base_type& _M_get_base() const { return *this; } public: constexpr __shared_ptr() noexcept : _Base_type() { } - template<typename _Tp1> - explicit __shared_ptr(_Tp1* __p) + template<typename _Tp1, typename = _SafeConv<_Tp1>> + explicit + __shared_ptr(_Tp1* __p) : _Base_type(__p, _Array_deleter()) { } - template<typename _Tp1, typename _Deleter> + template<typename _Tp1, typename _Deleter, typename = _SafeConv<_Tp1>> __shared_ptr(_Tp1* __p, _Deleter __d) : _Base_type(__p, __d) { } - template<typename _Tp1, typename _Deleter, typename _Alloc> + template<typename _Tp1, typename _Deleter, typename _Alloc, + typename = _SafeConv<_Tp1>> __shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a) : _Base_type(__p, __d, __a) { } @@ -360,22 +441,22 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION : _Base_type(std::move((__r._M_get_base()))) { } - template<typename _Tp1> - explicit __shared_ptr(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __r) + template<typename _Tp1, typename = _Compatible<_Tp1>> + explicit + __shared_ptr(const __weak_ptr<__libfund_v1<_Tp1>, _Lp>& __r) : _Base_type(__r._M_get_base()) { } - template<typename _Tp1, typename _Del, typename - = _Compatible<remove_pointer_t< - typename unique_ptr<_Tp1, _Del>::pointer>>> - __shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r) - : _Base_type(std::move(__r)) - { } + template<typename _Tp1, typename _Del, + typename = _UniqCompatible<_Tp1, _Del>> + __shared_ptr(unique_ptr<_Tp1, _Del>&& __r) + : _Base_type(std::move(__r)) + { } #if _GLIBCXX_USE_DEPRECATED // Postcondition: use_count() == 1 and __r.get() == 0 - template<typename _Tp1> - __shared_ptr(std::auto_ptr<_Tp1>&& __r) + template<typename _Tp1, typename = _Compatible<_Tp1>> + __shared_ptr(auto_ptr<_Tp1>&& __r) : _Base_type(std::move(__r)) { } #endif @@ -388,7 +469,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { __shared_ptr(nullptr).swap(*this); } template<typename _Tp1> - void + _SafeConv<_Tp1> reset(_Tp1* __p) { _GLIBCXX_DEBUG_ASSERT(__p == 0 || __p != get()); @@ -396,12 +477,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION } template<typename _Tp1, typename _Deleter> - void + _SafeConv<_Tp1> reset(_Tp1* __p, _Deleter __d) { __shared_ptr(__p, __d).swap(*this); } template<typename _Tp1, typename _Deleter, typename _Alloc> - void + _SafeConv<_Tp1> reset(_Tp1* __p, _Deleter __d, _Alloc __a) { __shared_ptr(__p, __d, std::move(__a)).swap(*this); } @@ -428,9 +509,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION return *this; } - template<typename _Tp1> - _Compatible<_Tp1, __shared_ptr&> - operator=(std::unique_ptr<_Tp1>&& __r) + template<typename _Tp1, typename _Del> + _UniqCompatible<_Tp1, _Del, __shared_ptr&> + operator=(unique_ptr<_Tp1, _Del>&& __r) { _Base_type::operator=(std::move(__r)); return *this; @@ -439,7 +520,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION #if _GLIBCXX_USE_DEPRECATED template<typename _Tp1> _Compatible<_Tp1, __shared_ptr&> - operator=(std::auto_ptr<_Tp1>&& __r) + operator=(auto_ptr<_Tp1>&& __r) { _Base_type::operator=(std::move(__r)); return *this; @@ -501,11 +582,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { template<typename _Tp1, typename _Res = void> using _Compatible - = enable_if_t<__sp_compatible<_Tp1, _Tp>::value, _Res>; + = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>; using _Base_type = __weak_ptr<remove_extent_t<_Tp>>; - _Base_type& _M_get_base() { return *this;} + _Base_type& _M_get_base() { return *this; } const _Base_type& _M_get_base() const { return *this; } public: @@ -630,26 +711,43 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Tp> class shared_ptr : public __shared_ptr<_Tp> { + using _Base_type = __shared_ptr<_Tp>; + + public: + using element_type = typename _Base_type::element_type; + + private: + // Constraint for construction from a pointer of type _Yp*: + template<typename _Yp> + using _SafeConv = enable_if_t<__sp_is_constructible_v<_Tp, _Yp>>; + template<typename _Tp1, typename _Res = void> using _Compatible - = enable_if_t<__sp_compatible<_Tp1, _Tp>::value, _Res>; + = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>; - using _Base_type = __shared_ptr<_Tp>; + template<typename _Tp1, typename _Del, + typename _Ptr = typename unique_ptr<_Tp1, _Del>::pointer, + typename _Res = void> + using _UniqCompatible = enable_if_t< + __sp_compatible_v<_Tp1, _Tp> + && experimental::is_convertible_v<_Ptr, element_type*>, + _Res>; public: - using element_type = typename _Base_type::element_type; // 8.2.1.1, shared_ptr constructors constexpr shared_ptr() noexcept = default; - template<typename _Tp1> - explicit shared_ptr(_Tp1* __p) : _Base_type(__p) { } + template<typename _Tp1, typename = _SafeConv<_Tp1>> + explicit + shared_ptr(_Tp1* __p) : _Base_type(__p) { } - template<typename _Tp1, typename _Deleter> + template<typename _Tp1, typename _Deleter, typename = _SafeConv<_Tp1>> shared_ptr(_Tp1* __p, _Deleter __d) : _Base_type(__p, __d) { } - template<typename _Tp1, typename _Deleter, typename _Alloc> + template<typename _Tp1, typename _Deleter, typename _Alloc, + typename = _SafeConv<_Tp1>> shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a) : _Base_type(__p, __d, __a) { } @@ -679,20 +777,20 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION shared_ptr(shared_ptr<_Tp1>&& __r) noexcept : _Base_type(std::move(__r)) { } - template<typename _Tp1> - explicit shared_ptr(const weak_ptr<_Tp1>& __r) + template<typename _Tp1, typename = _Compatible<_Tp1>> + explicit + shared_ptr(const weak_ptr<_Tp1>& __r) : _Base_type(__r) { } #if _GLIBCXX_USE_DEPRECATED - template<typename _Tp1> + template<typename _Tp1, typename = _Compatible<_Tp1>> shared_ptr(std::auto_ptr<_Tp1>&& __r) - : _Base_type() { } // TODO + : _Base_type(std::move(__r)) { } #endif - template<typename _Tp1, typename _Del, typename - = _Compatible<remove_pointer_t< - typename unique_ptr<_Tp1, _Del>::pointer>>> - shared_ptr(std::unique_ptr<_Tp1, _Del>&& __r) + template<typename _Tp1, typename _Del, + typename = _UniqCompatible<_Tp1, _Del>> + shared_ptr(unique_ptr<_Tp1, _Del>&& __r) : _Base_type(std::move(__r)) { } constexpr shared_ptr(nullptr_t __p) @@ -738,7 +836,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION #endif template <typename _Tp1, typename _Del> - _Compatible<_Tp1, shared_ptr&> + _UniqCompatible<_Tp1, _Del, shared_ptr&> operator=(unique_ptr<_Tp1, _Del>&& __r) { _Base_type::operator=(std::move(__r)); @@ -752,10 +850,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION private: template<typename _Alloc, typename... _Args> - shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a, - _Args&&... __args) - : _Base_type(__tag, __a, std::forward<_Args>(__args)...) - { } + shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a, + _Args&&... __args) + : _Base_type(__tag, __a, std::forward<_Args>(__args)...) + { } template<typename _Tp1, typename _Alloc, typename... _Args> friend shared_ptr<_Tp1> @@ -926,8 +1024,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION class weak_ptr : public __weak_ptr<_Tp> { template<typename _Tp1, typename _Res = void> - using _Compatible - = enable_if_t<__sp_compatible<_Tp1, _Tp>::value, _Res>; + using _Compatible = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>; using _Base_type = __weak_ptr<_Tp>; @@ -1147,6 +1244,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION shared_from_this() const { return shared_ptr<const _Tp>(this->_M_weak_this); } + weak_ptr<_Tp> + weak_from_this() noexcept + { return _M_weak_this; } + + weak_ptr<const _Tp> + weak_from_this() const noexcept + { return _M_weak_this; } + private: template<typename _Tp1> void |