Hello world,

I am starting using STL and, especially, list of STL with user-defined
types (= U.D.T).
First at all, my compiler warns me against illegal structure
operations. Indeed, I must to define comparison operators, namely
operator== and operator<, what I do, and all runs properly.
Often or sometimes, my U.D.T's are not sortable and I feel like to
say that to declare operator< in my U.D.T is nonsense, and yet, I
would like to define an list of my U.D.T and work with it (without
using sort algorithms, of course). But my compiler send compile errors,
cos I 'must' to define operator<.
Well, my question is :
Is it a problem with my compiler trying to generate instanciation
of not used template code or is it a conception problem in STL ?

I rarely read news, could you please reply me to bourez@tcts.fpms.ac.be

Thanks to everyone helping me.

christophe bourez
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Christophe Bourez <bourez@tcts.fpms.ac.be> writes:

> Often or sometimes, my U.D.T's are not sortable and I feel like to
> say that to declare operator< in my U.D.T is nonsense, and yet, I
> would like to define an list of my U.D.T and work with it (without
> using sort algorithms, of course). But my compiler send compile errors,
> cos I 'must' to define operator<.
> Well, my question is :
> Is it a problem with my compiler trying to generate instanciation
> of not used template code or is it a conception problem in STL ?

It's a problem of the compiler trying to instantiate unused code.
This is a compiler bug; unfortunately, it's a bug that shows up in
several different compilers.
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