Re: [Boost-users] [Bind] Understanding protect

Subject: Re: [Boost-users] [Bind] Understanding protect
From: Robert Jones (robertgbjones_at_[hidden])
Date: 2012-03-27 16:17:42

On Tue, Mar 27, 2012 at 7:25 PM, Gordon Woodhull <gordon_at_[hidden]>wrote:

>
> On Mar 27, 2012, at 2:13 PM, Robert Jones wrote:
> > Ultimately I'm doing this for each member of a
> > range, via std algorithm, so I need to bind a unary argument to produce
> a nullary function
> > object, which I can then pass to an evaluation context, ie my g( )
> function. If I've generated
> > the function object with bind and placeholder(s), it seems there's no
> way to prevent the binding
> > of the last placeholder from triggering evaluation, when what I require
> is an unevaluated nullary
> > function object.
>
> Hmm, works for me, IIUC:
>
> #include <boost/bind.hpp>
> #include <iostream>
>
> template<typename F>
> void g(F const &f) {
>  f();
> }
>
> void f(int x) {
>  std::cout << "x is " << x << std::endl;
> }
>
> int main() {
>  for(int i=0; i<7; ++i)
>    g(boost::bind(f,i));
>  return 0;
> }
>
>
>
But how would that translate to this context...?

int main( )
{
    std::vector<int> v;
    v += 0,1,2,3,4,5,6;
    for_each( v.begin( ), v.end( ), /* ???? */ );
    return 0;
}

Thx, Rob.