[Boost-users] [bind] Help with functional composition of shared_ptr::use_count in std::map

From: Hughes, James (jhughes_at_[hidden])
Date: 2007-06-11 07:03:47

Hello all,

I'm trying to use bind to help with removeif in a std::map<string,
shared_ptr<something> >. I want to remove items where the shared_ptr
use_count is 1.

map<string, shared_ptr<data> > Fred;

RemoveIf(Fred.begin(),
         Fred.end(),
         boost::bind(std::equal_to<long>(),
                1,
                boost::bind(&map<string, shared_ptr<data>
>::value_type::second::use_count, _1)
        )

However, I get a compile error on ::second not being a class or
namespace.

Anyone know how I should do this? I'm a beginner at boost::bind, so be
gentle....

James

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