[Boost-users] Re: transform_iterator and lambda functors

Rodrigo de Salvo Braz <braz@uiuc.edu> writes:

Hello,

I am trying to use transform_iterator with a lambda functor, but the compiler complains that the lambda functor does not contain a type called 'result_type', which the transform_iterator requires.

I would have expected lambda functors to have this type. Any ideas on why it doesn't?

Because often the result type depends on the argument type that is actually passed: (_1 + 3)(4) vs. (_1 + 3)(static_cast<char const*>("hello")) HTH, -- Dave Abrahams Boost Consulting http://www.boost-consulting.com