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Add "Deleter" template parameter to SharedPtr<> class to customize the destruction of T pointer.

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This commit is contained in:
David Capello 2011-01-16 09:41:00 -03:00
parent c3162846cf
commit c5ccc5110e
1 changed files with 23 additions and 13 deletions
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36
src/base/shared_ptr.h
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@ -7,10 +7,20 @@
#ifndef BASE_SHARED_PTR_H_INCLUDED
#define BASE_SHARED_PTR_H_INCLUDED
template<class T>
class DefaultSharedPtrDeleter
{
public:
static void destroy(T* ptr)
{
delete ptr;
}
};
// A class which wraps a pointer and keeps reference counting to
// automatically delete the pointed object when it is no longer
// used.
template<class T>
template<class T, class Deleter = DefaultSharedPtrDeleter<T> >
class SharedPtr
{
public:
@ -26,14 +36,14 @@ public:
ref();
}
SharedPtr(const SharedPtr<T>& other)
SharedPtr(const SharedPtr<T, Deleter>& other)
: m_ptr(other.m_ptr)
, m_refCount(other.m_refCount) {
ref();
}
template<class T2>
SharedPtr(const SharedPtr<T2>& other)
template<class T2, class Deleter2>
SharedPtr(const SharedPtr<T2, Deleter2>& other)
: m_ptr(static_cast<T*>(other.m_ptr))
, m_refCount(other.m_refCount) {
ref();
@ -52,7 +62,7 @@ public:
}
}
SharedPtr& operator=(const SharedPtr<T>& other) {
SharedPtr& operator=(const SharedPtr<T, Deleter>& other) {
if (m_ptr != other.m_ptr) {
unref();
m_ptr = other.m_ptr;
@ -62,8 +72,8 @@ public:
return *this;
}
template<class T2>
SharedPtr& operator=(const SharedPtr<T2>& other) {
template<class T2, class Deleter2>
SharedPtr& operator=(const SharedPtr<T2, Deleter2>& other) {
if (m_ptr != static_cast<T*>(other.m_ptr)) {
unref();
m_ptr = static_cast<T*>(other.m_ptr);
@ -92,7 +102,7 @@ private:
void unref() {
if (m_ptr) {
if (--(*m_refCount) == 0) {
delete m_ptr;
Deleter::destroy(m_ptr);
delete m_refCount;
}
m_ptr = 0;
@ -104,21 +114,21 @@ private:
T* m_ptr; // The pointee object.
int* m_refCount; // Number of references.
template<class T2> friend class SharedPtr;
template<class T2, class Deleter2> friend class SharedPtr;
};
// Compares if two shared-pointers points to the same place (object,
// memory address).
template<class T>
bool operator==(const SharedPtr<T>& ptr1, const SharedPtr<T>& ptr2)
template<class T, class Deleter>
bool operator==(const SharedPtr<T, Deleter>& ptr1, const SharedPtr<T, Deleter>& ptr2)
{
return ptr1.get() == ptr2.get();
}
// Compares if two shared-pointers points to different places
// (objects, memory addresses).
template<class T>
bool operator!=(const SharedPtr<T>& ptr1, const SharedPtr<T>& ptr2)
template<class T, class Deleter>
bool operator!=(const SharedPtr<T, Deleter>& ptr1, const SharedPtr<T, Deleter>& ptr2)
{
return ptr1.get() != ptr2.get();
}