Re: [ublas] ublas::vector in std::map

From: johanngoetz (jgoetz_at_[hidden])
Date: 2008-05-30 15:19:29

I have the same issue (though I am using ublas::bounded_vector instead). This
would be a great feature to have. Is anyone looking into this or have a
solution? (I'm using gcc v4.1.2, boost svn trunk at 2008-05-12 around v1.35)

martux wrote:
> 
> Hi,
> I tried using a ublas vector as key type in a std::map along the lines of
> 
> boost::ublas::vector<double> x(2);
> std::map<boost::ublas::vector<double>, int> vm;
> vm[x] = 1;
> 
> which wont compile (gcc 4.0.3) due to
> 
> /usr/lib/gcc/x86_64-linux-gnu/4.0.3/../../../../include/c++/4.0.3/bits/stl_function.h:227:
> error: no match 
> for ‘operator<’ in ‘__x < __y’.
> 
> Adding an implementation of
> 
> bool operator<(boost::ublas::vector<double> const& A,
> boost::ublas::vector<double> const& B) {...}
> 
> unfortunately doesnt help. Could anyone please point out what I am
> missing?
> 

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