Re: [Boost-users] [Phoenix] for_each calling push_back for stl containers

Subject: Re: [Boost-users] [Phoenix] for_each calling push_back for stl containers
From: Ryan (boost_at_[hidden])
Date: 2012-07-15 13:38:55

On Thu, Jul 12, 2012 at 6:46 PM, Joel de Guzman
<joel_at_[hidden]>wrote:

>
> You did not evaluate it. Try adding a () at the end:
>
>   phx::for_each(phx::ref(tokens)**,
>     phx::lambda
>     [
>       phx::push_back(phx::ref(**string_tokens), phx::arg_names::arg1)
>     ]
>   )();

Adding the evaluation worked.  I get the expected results now.

I now have the simplest pure phoenix method to parse a boost tokenizer into
a vector of strings.  Is there a helper method that can be written to
automatically append the phx::lambda in this case.  This would give the
following results.

phx::for_each(phx::ref(tokens), phx::push_back(phx::ref(string_tokens),
phx::arg_names::arg1))();

I understand the advantage of the lambda section.  It allows added
variables to be created and more complicated requirements to be
accomplished.  I just want to try and remove the extra syntax from my users
view if it isn't necessary (other than to make it work :) ).  I would think
it's possible if the argument from one method is being used directly in the
other method without creating any additional variables.

Like I said, I'm not sure if this is possible but would like to try if it
is.

Ryan