[boost] BCCL enhancement

From: François Wanadoo (francois.amelie_at_[hidden])
Date: 2002-12-06 15:58:48

Hello Boosters

        I am currently developing some template algorithm and had some trouble
using BCCL. I have an algorithm using a unary function as one of its
template parameter but I don't care about the result type of this unary
function (like the for_each standard algo). I can't use the
UnaryFunctionConcept because you have to stipulate the result type. What do
you think about creating a boost::AnyType to indicate that we don't care
about a type in a template specialization. A very simple partial
specialization of UnaryFunctionConcept would lead to:

        template <class Func, class Arg>
        struct UnaryFunctionConcept<Func, AnyType, Arg> {
          void constraints() {
                f(arg);
          }
          Func f;
          Arg arg;
        };

        I know it is the same specialization that for the void result type and I
could have use it but I don't want to use it because I don't want a void
unary function I want a AnyType unary function!

I also want to signal that the type_traits/conversion_traits.hpp file is
included twice in the concept_check.hpp.

I am waiting for your remarks, thank you for reading.