Re: [boost] Why don't lambda funcs work for stl function objects?

From: Jaakko Jarvi (jajarvi_at_[hidden])
Date: 2004-05-13 15:37:10

On May 13, 2004, at 3:32 PM, Neal D. Becker wrote:

> Any reason lambda functions can't meet requirements for 
> std::unary_function,
> for example?  Specifically, it seems result_type is not defined.
>
> For example boost::constant(0) doesn't have result_type, so can't be 
> used
> where a std::unary_function is needed.
>

In general the result_type is not known until the parameter types of 
the lambda_functor
are known. So for consistency (or laziness), result_type is not 
provided for any
lambda functor.

   Jaakko