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Id
5444534
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0
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0
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1
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CreationDate
2011-03-26T18:57:54.303
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2011-03-26T18:57:54.303
LastEditDate
2017-05-23T11:47:41.057
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-1
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5444327
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2
Score
5
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0
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text
Body
You can write a transform iterator to convert the <code>weak_ptr<T></code> to a <code>weak_ptr<const T></code>. Since you're already using Boost, you can use <code>boost::transform_iterator</code>: <pre><code>#include <boost/iterator/transform_iterator.hpp> #include <boost/shared_ptr.hpp> #include <boost/weak_ptr.hpp> #include <set> // Functor to transform a weak_ptr<T> to a weak_ptr<const T> template <typename T> struct make_weak_ptr_const : std::unary_function<boost::weak_ptr<T>, boost::weak_ptr<const T> > { boost::weak_ptr<const T> operator()(const boost::weak_ptr<T>& p) const { return p; } }; struct S { }; // Container demonstrating use of make_weak_ptr_const: struct my_awesome_container { typedef std::set<boost::weak_ptr<S> > BaseSet; typedef BaseSet::const_iterator BaseIterator; typedef boost::transform_iterator< make_weak_ptr_const<S>, BaseIterator > iterator; iterator begin() const { return TransformedIterator(data.begin()); } iterator end() const { return TransformedIterator(data.end()); } std::set<boost::weak_ptr<S> > data; }; </code></pre> If you don't want to use <code>boost::transform_iterator</code>, it is a straightforward task to write your own. I showed how to do this in <a href="https://stackoverflow.com/questions/2467000/is-there-a-java-map-keyset-equivalent-for-cs-stdmap/5099345#5099345">an answer to another question</a>.
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1. POstd::set of boost::weak_ptr<T> - Getting const_iterator to const T?
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1. USCommunity
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1. USJames McNellis
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1. POstd::set of boost::weak_ptr<T> - Getting const_iterator to const T?
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1. COThank you, I had no clue such a function existed. This is perfect!
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