Re: [Boost-users] [phoenix] A simple lambda func as boost::function

Subject: Re: [Boost-users] [phoenix] A simple lambda func as boost::function
From: Richard Vock (vock_at_[hidden])
Date: 2009-12-14 19:55:07

Hehe, I already tried that and it gives me this handy little
error message:
http://pastebin.com/m787325af

Essentially telling me something I don't understand at all
about boost::phoenix::at not being a function...

> Richard Vock wrote:
>> Hi boost gurus,
>> 
>> after some time and a lot of pain I somehow managed
>> to work with boost.lambda in a way that actually
>> outweighs the costs (code elegance versus time spent
>> compiling it), but I miss some features (like local
>> variables) I see in that cute phoenix documentation
>> and a lot of mailing list threads which all seem
>> to propose using phoenix rather than lambda (and it
>> indeed looks a lot better).
>> 
>> But whenever I try to use it, I somehow fail at the
>> most simple tasks. Take for example this minimalistic
>> code example here (note the use of #define USE_LAMBDA):
>> http://pastebin.com/m3f590a01
>> 
>> Both versions (with and without USE_LAMBDA defined) 
compile
>> well on the most recent stable g++ compiler, but the
>> phoenix version does not output anything. Not at all.
>> Also note, that this exact lambda expression is mentioned
>> here:
>> http://tinyurl.com/ybmp2lw
>> (well, without the << "\n" but that doesn't change the
>> problem)
>> 
>> Could someone please enlighten me by telling me what I 
have
>> to do here? I should mention I am bound to 
boost::function,
>> not some funky phoenix::actor derivations...
> 
> Try removing lambda:
> 
>     doSth(cout << arg1 << "\n");
> 
> Also, endl works on phoenix:
> 
>     doSth(cout << arg1 << std::endl);
> 
> Regards,