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AK: Make it more more pleasant to copy RefPtr's.

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I had a silly ambition that we would avoid unnecessary ref count churn by
forcing explicit use of "copy_ref()" wherever a copy was actually needed.
This was making RefPtr a bit clunky to work with, for no real benefit.

This patch adds the missing copy construction/assignment stuff to RefPtr.
This commit is contained in:
Andreas Kling 2019-07-11 15:36:01 +02:00
parent 32fb7ecef4
commit 560d037c41
Notes: sideshowbarker 2024-07-19 13:19:57 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/560d037c41d
1 changed files with 30 additions and 0 deletions
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30
AK/RefPtr.h
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@ -42,6 +42,17 @@ public:
: m_ptr(other.leak_ref())
{
}
RefPtr(const NonnullRefPtr<T>& other)
: m_ptr(const_cast<T*>(other.ptr()))
{
m_ptr->ref();
}
template<typename U>
RefPtr(const NonnullRefPtr<U>& other)
: m_ptr(static_cast<T*>(const_cast<U*>(other.ptr())))
{
m_ptr->ref();
}
template<typename U>
RefPtr(NonnullRefPtr<U>&& other)
: m_ptr(static_cast<T*>(&other.leak_ref()))
@ -100,6 +111,16 @@ public:
return *this;
}
RefPtr& operator=(const NonnullRefPtr<T>& other)
{
if (m_ptr != other.ptr())
deref_if_not_null(m_ptr);
m_ptr = const_cast<T*>(other.ptr());
ASSERT(m_ptr);
ref_if_not_null(m_ptr);
return *this;
}
template<typename U>
RefPtr& operator=(const NonnullRefPtr<U>& other)
{
@ -111,6 +132,15 @@ public:
return *this;
}
RefPtr& operator=(const RefPtr& other)
{
if (m_ptr != other.ptr())
deref_if_not_null(m_ptr);
m_ptr = const_cast<T*>(other.ptr());
ref_if_not_null(m_ptr);
return *this;
}
template<typename U>
RefPtr& operator=(const RefPtr<U>& other)
{