At 1:40 PM +0300 9/20/04, Peter Dimov wrote:
Michael Rutman wrote:
I'd like to propose adding a template function to shared_ptr to allow the automatic testing of a shared_ptr to its raw ptr.
The template is as simple as
template <class T> bool operator==(boost::shared_ptr<T> const & a, T * const & b) { return a.get() == b; }
Here is the case where I need it.
I have a vector<Foo> myFoo.
In a method of Foo I need to see if this instance is in the vector. I want to do this
vector<Foo>::iterator iter = find( myFoo.begin(), myFoo.end(), this );
This is a reasonable suggestion. It turns out that std::find _is_ specified in a way that allows heterogeneous comparisons, although this may be an oversight on the part of the committee and not a design decision. ;-)
I just found out that on gcc 2.96 it also needs the following template <class T> bool operator!=(boost::shared_ptr<T> const & a, T * const & b) { return a.get() != b; } gcc 3.3 works fine without this template but the earlier gcc needs both. I'm not sure how that effects the proposal. Peter, I see that you are the maintainer of shared_ptr. Is there any chance you'll add this for the next release of boost? Thanks