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Reintroduced weak_ptr converting constructor; map<weak_ptr<>, ...> is important.

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[SVN r16400]
This commit is contained in:
Peter Dimov
2002-11-25 12:09:13 +00:00
parent 1f9908be69
commit 980307a90a
1 changed files with 14 additions and 4 deletions
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18
include/boost/weak_ptr.hpp
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@@ -60,10 +60,12 @@ public:
// It is not possible to avoid spurious access violations since // It is not possible to avoid spurious access violations since
// in multithreaded programs r.px may be invalidated at any point. // in multithreaded programs r.px may be invalidated at any point.
// //
// A weak_ptr<T> can safely be obtained from a weak_ptr<U> by using
// template<class Y>
// weak_ptr<T> wpt = make_shared(wpu); weak_ptr(weak_ptr<Y> const & r): pn(r.pn) // never throws
// {
px = boost::make_shared(r).get();
}
template<class Y> template<class Y>
weak_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws weak_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws
@@ -72,6 +74,14 @@ public:
#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200) #if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
template<class Y>
weak_ptr & operator=(weak_ptr<Y> const & r) // never throws
{
px = boost::make_shared(r).get();
pn = r.pn;
return *this;
}
template<class Y> template<class Y>
weak_ptr & operator=(shared_ptr<Y> const & r) // never throws weak_ptr & operator=(shared_ptr<Y> const & r) // never throws
{ {