Re: [Blitz-support] How to used TinyVector in set.

[Erik Z. <ze...@ma...>]

On Wed, Jun 11, 2008 at 6:15 AM, Xu Haihua <g06...@nu...> wrote:
>
>  Hi everyone:
>  I have compiler error when I use TinyVector with STL set.
>
> I tried to insert the term to the  set<TinyVector<int,2> >  but have
> compiler problem. (compiler is MSVC8)
> Can anyone give me an example how to use set with TinyVector<int,2>?
> Thanks.
>
>
> The program is below:
>
> #include "stdafx.h"
> #include <blitz/array.h>
> #include <blitz/tinyvec.h>
> #include<set>
>
> using namespace std;
> using namespace blitz;
> int main()
> {
>  set<TinyVector<int,2> > myset;
>  TinyVector<int,2> term;
>  term[0]=1;
>  term[1]=2;
>  myset.insert(term);
> }
>

std::set requires a comparison (<) operator returning a single bool.
TinyVector returns an expression template that is (I believe)
convertible to TinyVector<bool, 2>, not a bool.  You'll need to supply
your own comparison function (the second template argument to
std::set).

Erik

-- 
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Erik Zeek
ze...@ma...
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