From: Hughes, James (jhughes_at_[hidden])
Date: 2007-06-11 07:42:24
> > 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
>
>
> Sorry, that should read remove_if, and in fact the purpose is
> better served using shared_ptr<>::unique, which should mean I
> can get rid of the std:equal_to stuff
>
> RemoveIf(Fred.begin(),
> Fred.end(),
> boost::bind(&map<string, shared_ptr<data>
> >::value_type::second::unique, _1)
> )
>
> Still get same compile fault however.
>
> James
>
>
Have now replaced second in above with second_type
Remove_if(Fred.begin(),
Fred.end(),
boost::bind(&map<string, shared_ptr<data>
>::value_type::second_type::unique, _1)
)
And am not getting a completely differnet error - bind seems to be doing
a load of work, but eventually I get an
mem_fn_template.hpp:90: error : No matching function for call to
'get_pointer(const std::pair<const std::string, boost::shared_ptr<data>
> &)'
I'm running out of ideas here so all welcome..
James
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