Re: [Boost-users] [phoenix] accumulate with data member binding

2 Nov 2008


      Thanks Joel. What does it mean when you say that arg1 is the state and
arg2 is the point? Also, looking in the phoenix documentation I see
that there is an accumulate version. How would I use that one in my
context?

Thanks,
Christian

On Fri, Oct 31, 2008 at 7:52 PM, Joel de Guzman  wrote:
...
Christian Henning wrote:
...
Hi there, the following snippet doesn't compile which surprises me a
little. Could somebody tell what's wrong?
#include <algorithm>
#include <vector>
#include <numeric>
#include 
#include 
#include 
using namespace boost::phoenix;
using namespace boost::phoenix::arg_names;
using namespace std;
struct point
{
   double _prob;
   double _x;
};
int _tmain(int argc, _TCHAR* argv[])
{
   std::vector< point > d;
double sum_prob = std::accumulate( d.begin()
                                    , d.end()
                                    , 0.0
                                    , bind( &point::_prob, arg1 )
                                    );
return 0;
}
I'm using Visual Studio 2005. This is the error I'm getting:
error C2296: '.*' : illegal, left operand has type 'double'
Rightly so. arg1 is the state. arg2 is the point. You might want to
try:
bind( &point::_prob, arg2 )
For example,
bind( &point::_prob, arg2 ) + arg1
adds all _prob(s)
HTH.
Regards,
--
Joel de Guzman
http://www.boostpro.com
http://spirit.sf.net
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