Re: using operator() in for_each

From:

ymett <ymett.on.usenet@gmail.com>

Newsgroups:

comp.lang.c++.moderated

Date:

Thu, 10 Sep 2009 14:57:16 CST

Message-ID:

<0be2ec67-d044-4a36-8bb9-9fd763cbf017@o10g2000yqa.googlegroups.com>

On Sep 9, 9:43 pm, restor <akrze...@gmail.com> wrote:

Hi,
The question I want to ask here is if the following code could be
simplified.
I have a collection of callbacks:

std::vector< boost::function<void()> > col;

In fact, I have a collection of my own types with function call
operator; I just want to keep the example simple.
Now, I need to call all of them:

for_each( col.begin(), col.end(), ??? );

What shall I put in place of '???'. Write my own functor class? Use
boost::bind?

namespace bll = boost::lambda;

for_each( col.begin(), col.end(), bll::bind(bll::_1) );

boost::bind does not evaluate its first argument so it won't work with
the above syntax. However, it does provide a function object to
achieve this:

for_each( col.begin(), col.end(), boost::bind(boost::apply<void>(),
_1) );

Yechezkel Mett

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