[boost] explicit shared_ptr(weak_ptr<Y> const & r);

From: John Torjo (john.lists_at_[hidden])
Date: 2004-10-13 11:33:20

Hi Peter,

Just a thought: perhaps this constructor:
explicit shared_ptr(weak_ptr<Y> const & r);

should be private,
and the only way to create a shared_ptr from a weak_ptr is:

shared_ptr<T> val = weak->lock();

This way, the shared_ptr public constructors will never throw. Users 
will not make mistakes like this:

shared_ptr<T> val = weak;

I'm saying this, because I just made this mistake a few hours ago... 
After a while, the shared_ptr<> constructor started to throw at me ;)

Best,
John

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John Torjo,    Contributing editor, C/C++ Users Journal
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