RE: [Boost-Users] operator == in shared_ptr

From: bjorn.karlsson_at_[hidden]
Date: 2002-04-30 06:17:53

> From: sashan [mailto:sashang_at_[hidden]]
[snip]
> Is there a better way that doesn't involve 1) having to write 
> a wrapper class around a basic type (or any type) and 2) 
> doesn't involve changing the shared_ptr::operator==.
> 

As others have pointed out, the solution is to use a function object and
std::find_if. In this case, the comparison doesn't even need a separate
predicate - the (exceptionally cool) Boost.Bind library can be used instead:

vector<shared_ptr<int> >::iterator
it=std::find_if(vec.begin(),vec.end(),bind(std::equal_to<int>(),bind(&shared
_ptr<int>::operator*, _1),42));

Bjorn Karlsson

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