Re: [boost] [lambda] extension question

On Behalf Of Jaakko Järvi:

Yes, a null_type is passed to sig. This is because the signature of the

zero argument lambda function (in lambda_functor class) signature is instantiated always, regardless of whether it is called or not. And there the argument list is just null_type. Hence, the return type deduction is not allowed to cause a compilation error in the case where the argument tuple to sig is null_type.

That makes sense. After looking around some more I found what seems to be an easier way to do it using the action<> template that hides this problem. Thanks, Brock