[Boost-users] Re: boost::unary_traits

Ian McCulloch wrote:

...

class indirecter_unary : public std::unary_function< typename boost::unary_traits<Operation>::argument_type*, typename boost::unary_traits<Operation>::result_type >

That will still cause problems with pointers to references.

That is one point where I wasn't yet sure (the compiler also complained about it): Why is it illegal to have pointers to references at all?

There is still a subtle problem here with what the argument_type should be when Operator takes is argument by value. indirecter_unary should then have an argument_type that is a pointer to const. One way to achieve that would be to use remove_reference::type>::type* as the argument_type.

Are those two function templates also defined in call_traits.hpp? I can't find them in the library docs. -- Matthias Kaeppler