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Correctly implement weak_ptr assignment/copy/moves (#1399)

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Steven Dee (Jōshin) 2025-04-17 14:01:20 -07:00 • committed by GitHub
parent fbc4fcbb71
commit 66d1050af6
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1 changed files with 34 additions and 0 deletions
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34
ctl/shared_ptr.h
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@ -382,6 +382,34 @@ class weak_ptr
rc->keep_weak(); rc->keep_weak();
} }
weak_ptr(weak_ptr const& r) noexcept : p(r.p), rc(r.rc)
{
if (rc)
rc->keep_weak();
}
template<typename U>
requires __::shared_ptr_compatible<T, U>
weak_ptr(weak_ptr<U> const& r) noexcept : p(r.p), rc(r.rc)
{
if (rc)
rc->keep_weak();
}
weak_ptr(weak_ptr&& r) noexcept : p(r.p), rc(r.rc)
{
r.p = nullptr;
r.rc = nullptr;
}
template<typename U>
requires __::shared_ptr_compatible<T, U>
weak_ptr(weak_ptr<U>&& r) noexcept : p(r.p), rc(r.rc)
{
r.p = nullptr;
r.rc = nullptr;
}
~weak_ptr() ~weak_ptr()
{ {
if (rc) if (rc)
@ -410,6 +438,12 @@ class weak_ptr
swap(rc, r.rc); swap(rc, r.rc);
} }
weak_ptr& operator=(weak_ptr r) noexcept
{
swap(r);
return *this;
}
shared_ptr<T> lock() const noexcept shared_ptr<T> lock() const noexcept
{ {
if (expired()) if (expired())