fix move ctor/assignment

This commit is contained in:
Günter Obiltschnig 2020-01-21 19:58:12 +01:00
parent 18adb1e43b
commit eeb64cc340
4 changed files with 50 additions and 48 deletions

View File

@ -47,7 +47,7 @@ class AutoPtr
/// AutoPtr works in the following way: /// AutoPtr works in the following way:
/// If an AutoPtr is assigned an ordinary pointer to /// If an AutoPtr is assigned an ordinary pointer to
/// an object (via the constructor or the assignment operator), /// an object (via the constructor or the assignment operator),
/// it takes ownership of the object and the object's reference /// it takes ownership of the object and the object's reference
/// count remains unchanged. /// count remains unchanged.
/// If the AutoPtr is assigned another AutoPtr, the /// If the AutoPtr is assigned another AutoPtr, the
/// object's reference count is incremented by one by /// object's reference count is incremented by one by
@ -84,7 +84,7 @@ public:
ptr._ptr = nullptr; ptr._ptr = nullptr;
} }
template <class Other> template <class Other>
AutoPtr(const AutoPtr<Other>& ptr): _ptr(const_cast<Other*>(ptr.get())) AutoPtr(const AutoPtr<Other>& ptr): _ptr(const_cast<Other*>(ptr.get()))
{ {
if (_ptr) _ptr->duplicate(); if (_ptr) _ptr->duplicate();
@ -94,7 +94,7 @@ public:
{ {
if (_ptr) _ptr->release(); if (_ptr) _ptr->release();
} }
AutoPtr& assign(C* ptr) AutoPtr& assign(C* ptr)
{ {
if (_ptr != ptr) if (_ptr != ptr)
@ -115,7 +115,7 @@ public:
} }
return *this; return *this;
} }
AutoPtr& assign(const AutoPtr& ptr) AutoPtr& assign(const AutoPtr& ptr)
{ {
if (&ptr != this) if (&ptr != this)
@ -126,8 +126,8 @@ public:
} }
return *this; return *this;
} }
template <class Other> template <class Other>
AutoPtr& assign(const AutoPtr<Other>& ptr) AutoPtr& assign(const AutoPtr<Other>& ptr)
{ {
if (ptr.get() != _ptr) if (ptr.get() != _ptr)
@ -182,12 +182,12 @@ public:
AutoPtr& operator = (AutoPtr&& ptr) noexcept AutoPtr& operator = (AutoPtr&& ptr) noexcept
{ {
if (_ptr) _ptr->release(); if (_ptr) _ptr->release();
_ptr = std::move(ptr._ptr); _ptr = ptr._ptr;
ptr._ptr = nullptr; ptr._ptr = nullptr;
return *this; return *this;
} }
template <class Other> template <class Other>
AutoPtr& operator = (const AutoPtr<Other>& ptr) AutoPtr& operator = (const AutoPtr<Other>& ptr)
{ {
return assign<Other>(ptr); return assign<Other>(ptr);
@ -197,8 +197,8 @@ public:
{ {
std::swap(_ptr, ptr._ptr); std::swap(_ptr, ptr._ptr);
} }
template <class Other> template <class Other>
AutoPtr<Other> cast() const AutoPtr<Other> cast() const
/// Casts the AutoPtr via a dynamic cast to the given type. /// Casts the AutoPtr via a dynamic cast to the given type.
/// Returns an AutoPtr containing NULL if the cast fails. /// Returns an AutoPtr containing NULL if the cast fails.
@ -211,7 +211,7 @@ public:
return AutoPtr<Other>(pOther, true); return AutoPtr<Other>(pOther, true);
} }
template <class Other> template <class Other>
AutoPtr<Other> unsafeCast() const AutoPtr<Other> unsafeCast() const
/// Casts the AutoPtr via a static cast to the given type. /// Casts the AutoPtr via a static cast to the given type.
/// Example: (assume class Sub: public Super) /// Example: (assume class Sub: public Super)
@ -269,12 +269,12 @@ public:
{ {
return _ptr; return _ptr;
} }
operator const C* () const operator const C* () const
{ {
return _ptr; return _ptr;
} }
bool operator ! () const bool operator ! () const
{ {
return _ptr == nullptr; return _ptr == nullptr;
@ -284,7 +284,7 @@ public:
{ {
return _ptr == nullptr; return _ptr == nullptr;
} }
C* duplicate() C* duplicate()
{ {
if (_ptr) _ptr->duplicate(); if (_ptr) _ptr->duplicate();

View File

@ -123,7 +123,7 @@ public:
Nullable& assign(C&& value) Nullable& assign(C&& value)
/// Assigns a value to the Nullable. /// Assigns a value to the Nullable.
{ {
_value = value; _value = std::move(value);
_isNull = false; _isNull = false;
return *this; return *this;
} }
@ -152,7 +152,7 @@ public:
Nullable& operator = (C&& value) Nullable& operator = (C&& value)
/// Move-assigns a value to the Nullable. /// Move-assigns a value to the Nullable.
{ {
return assign(value); return assign(std::move(value));
} }
Nullable& operator = (const Nullable& other) Nullable& operator = (const Nullable& other)

View File

@ -105,7 +105,7 @@ public:
Optional& assign(C&& value) Optional& assign(C&& value)
/// Moves a value into the Optional. /// Moves a value into the Optional.
{ {
_value = value; _value = std::move(value);
_isSpecified = true; _isSpecified = true;
return *this; return *this;
} }
@ -125,7 +125,7 @@ public:
Optional& operator = (C&& value) Optional& operator = (C&& value)
{ {
return assign(value); return assign(std::move(value));
} }
Optional& operator = (const Optional& other) Optional& operator = (const Optional& other)

View File

@ -44,7 +44,7 @@ public:
{ {
return --_cnt; return --_cnt;
} }
int referenceCount() const int referenceCount() const
{ {
return _cnt.value(); return _cnt.value();
@ -61,7 +61,7 @@ class ReleasePolicy
/// simply uses the delete operator to delete an object. /// simply uses the delete operator to delete an object.
{ {
public: public:
static void release(C* pObj) static void release(C* pObj) noexcept
/// Delete the object. /// Delete the object.
/// Note that pObj can be nullptr. /// Note that pObj can be nullptr.
{ {
@ -75,7 +75,7 @@ class ReleaseArrayPolicy
/// The release policy for SharedPtr holding arrays. /// The release policy for SharedPtr holding arrays.
{ {
public: public:
static void release(C* pObj) static void release(C* pObj) noexcept
/// Delete the object. /// Delete the object.
/// Note that pObj can be nullptr. /// Note that pObj can be nullptr.
{ {
@ -94,11 +94,11 @@ class SharedPtr
/// can be used with any class. For this to work, a /// can be used with any class. For this to work, a
/// SharedPtr manages a reference count for the object /// SharedPtr manages a reference count for the object
/// it manages. /// it manages.
/// ///
/// SharedPtr works in the following way: /// SharedPtr works in the following way:
/// If an SharedPtr is assigned an ordinary pointer to /// If an SharedPtr is assigned an ordinary pointer to
/// an object (via the constructor or the assignment operator), /// an object (via the constructor or the assignment operator),
/// it takes ownership of the object and the object's reference /// it takes ownership of the object and the object's reference
/// count is initialized to one. /// count is initialized to one.
/// If the SharedPtr is assigned another SharedPtr, the /// If the SharedPtr is assigned another SharedPtr, the
/// object's reference count is incremented by one. /// object's reference count is incremented by one.
@ -115,33 +115,41 @@ class SharedPtr
public: public:
typedef C Type; typedef C Type;
SharedPtr(): _pCounter(nullptr), _ptr(nullptr) SharedPtr():
_pCounter(nullptr),
_ptr(nullptr)
{ {
} }
SharedPtr(C* ptr) SharedPtr(C* ptr)
try: try:
_pCounter(ptr ? new RC : nullptr), _pCounter(ptr ? new RC : nullptr),
_ptr(ptr) _ptr(ptr)
{ {
} }
catch (...) catch (...)
{ {
RP::release(ptr); RP::release(ptr);
} }
template <class Other, class OtherRP> template <class Other, class OtherRP>
SharedPtr(const SharedPtr<Other, RC, OtherRP>& ptr): _pCounter(ptr._pCounter), _ptr(const_cast<Other*>(ptr.get())) SharedPtr(const SharedPtr<Other, RC, OtherRP>& ptr):
_pCounter(ptr._pCounter),
_ptr(const_cast<Other*>(ptr.get()))
{ {
if (_pCounter) _pCounter->duplicate(); if (_pCounter) _pCounter->duplicate();
} }
SharedPtr(const SharedPtr& ptr): _pCounter(ptr._pCounter), _ptr(ptr._ptr) SharedPtr(const SharedPtr& ptr):
_pCounter(ptr._pCounter),
_ptr(ptr._ptr)
{ {
if (_pCounter) _pCounter->duplicate(); if (_pCounter) _pCounter->duplicate();
} }
SharedPtr(SharedPtr&& ptr) noexcept: _pCounter(std::move(ptr._pCounter)), _ptr(std::move(ptr._ptr)) SharedPtr(SharedPtr&& ptr) noexcept:
_pCounter(ptr._pCounter),
_ptr(ptr._ptr)
{ {
ptr._pCounter = nullptr; ptr._pCounter = nullptr;
ptr._ptr = nullptr; ptr._ptr = nullptr;
@ -149,14 +157,7 @@ public:
~SharedPtr() ~SharedPtr()
{ {
try release();
{
release();
}
catch (...)
{
poco_unexpected();
}
} }
SharedPtr& assign(C* ptr) SharedPtr& assign(C* ptr)
@ -168,7 +169,7 @@ public:
} }
return *this; return *this;
} }
SharedPtr& assign(const SharedPtr& ptr) SharedPtr& assign(const SharedPtr& ptr)
{ {
if (&ptr != this) if (&ptr != this)
@ -178,7 +179,7 @@ public:
} }
return *this; return *this;
} }
template <class Other, class OtherRP> template <class Other, class OtherRP>
SharedPtr& assign(const SharedPtr<Other, RC, OtherRP>& ptr) SharedPtr& assign(const SharedPtr<Other, RC, OtherRP>& ptr)
{ {
@ -223,9 +224,10 @@ public:
SharedPtr& operator = (SharedPtr&& ptr) noexcept SharedPtr& operator = (SharedPtr&& ptr) noexcept
{ {
_ptr = std::move(ptr._ptr); release();
_pCounter = std::move(ptr._pCounter); _ptr = ptr._ptr;
ptr._ptr = nullptr; ptr._ptr = nullptr;
_pCounter = ptr._pCounter;
ptr._pCounter = nullptr; ptr._pCounter = nullptr;
return *this; return *this;
} }
@ -242,7 +244,7 @@ public:
std::swap(_pCounter, ptr._pCounter); std::swap(_pCounter, ptr._pCounter);
} }
template <class Other> template <class Other>
SharedPtr<Other, RC, RP> cast() const SharedPtr<Other, RC, RP> cast() const
/// Casts the SharedPtr via a dynamic cast to the given type. /// Casts the SharedPtr via a dynamic cast to the given type.
/// Returns an SharedPtr containing NULL if the cast fails. /// Returns an SharedPtr containing NULL if the cast fails.
@ -257,7 +259,7 @@ public:
return SharedPtr<Other, RC, RP>(); return SharedPtr<Other, RC, RP>();
} }
template <class Other> template <class Other>
SharedPtr<Other, RC, RP> unsafeCast() const SharedPtr<Other, RC, RP> unsafeCast() const
/// Casts the SharedPtr via a static cast to the given type. /// Casts the SharedPtr via a static cast to the given type.
/// Example: (assume class Sub: public Super) /// Example: (assume class Sub: public Super)
@ -303,7 +305,7 @@ public:
{ {
return _ptr; return _ptr;
} }
operator const C* () const operator const C* () const
{ {
return _ptr; return _ptr;
@ -408,7 +410,7 @@ public:
{ {
return get() >= ptr; return get() >= ptr;
} }
int referenceCount() const int referenceCount() const
{ {
return _pCounter ? _pCounter->referenceCount() : 0; return _pCounter ? _pCounter->referenceCount() : 0;
@ -423,7 +425,7 @@ private:
return _ptr; return _ptr;
} }
void release() void release() noexcept
{ {
if (_pCounter && _pCounter->release() == 0) if (_pCounter && _pCounter->release() == 0)
{ {