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

1 Nov 2008

      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