Re: [Boost-users] Inconsistency between boost::bind and boost::lambda::bind

From: Pablo Aguilar (pablo.aguilar_at_[hidden])
Date: 2006-05-08 14:53:10

If you must include both, I'd suggest using the namespace alias (as I've 
commonly seen it: bll = boost::lambda)

While I don't know of an exhaustive comparison, I do believe that 
boost::bind has better support for smart pointers.

As to the const/non-const ref problem, try using boost::ref.

HTH,
Pablo Aguilar

Gerardo Lamastra wrote:
>  
> Hello everybody,
> 
> I've started to use the functional programming facilities offered
> by boost, and they're really impressive.
> 
> To begin with, I've started using both; I've seen however, that
> when I #include both and
> I must use full namespace names to address lambda placeholders.
> In other words, instead of writing
<snip code>
> also if I've written a using boost::lambda declaration; I know,
> 
> I can simplify this using a namespace alias, but I was trying to
> keep the code less clobber as I can, because it has to be used
> for teaching/example purposes.
> So, my first question would be: where could I find an exhaustive
> comparison between these two facilities? And, is there any indication
> on what to prefer, also related to future development and/or inclusion
> in C++ standards (If I remember well, boost::lambda has been proposed
> in tr1?)
> 
> The second question points at a small inconsistency that I believe
> I've found while doing some experiments: boost::bind and
> boost::lambda::bind offer similar construct, but the former works
> while the latter fails in the example included below.
> 
> The situation is the following: if I try to create a nullary
> lamnda function with boost::lambda::bind()
> like this:
> 
> generate_n(inserter(v, v.begin()), 10,
> boost::lambda::bind(
> boost::lambda::new_ptr(),*this) );
> 
> the compiler fails to compile: it tries to pass the this pointer
> as a const reference somehow, and then it fails claiming that
> a Slave(const Master& m) cannot be found; If I try to add one,
> it fails with a similar error.
> 
> If I substitute the boost::lambda::bind() with a boost::bind(),
> it compiles & works perfectly.
> 
> Thanks for the attention,
> -Gerardo Lamastra

<snip code and legal notice>