Re: [Boost-users] [accumulators] Help required for using UDT as Sample

Subject: Re: [Boost-users] [accumulators] Help required for using UDT as Sample
From: dhruva (dhruva_at_[hidden])
Date: 2009-02-25 00:41:37

Hello,
 Thank you for  offering to have a look, here is the code.

regards,
-dhruva

// Starts here
#include <stdio.h>
#include <iostream>
#include <vector>

#include <boost/accumulators/accumulators.hpp>
#include <boost/accumulators/statistics/stats.hpp>
#include <boost/accumulators/statistics/min.hpp>

using namespace std;
namespace bacc = boost::accumulators;
using namespace bacc;

typedef struct {
    size_t _time;
    double _value;
} time_val_t;

/* Wrapper class as I cannot modify time_val_t */
class acc_sample {
public:
    time_val_t _data;

    acc_sample(time_t t = 0, double v = 0.0) {
        _data._time = t;
        _data._value = v;
    }

    acc_sample(const time_val_t &i) {
        _data = i;
    }

    acc_sample(const acc_sample &i) {
        _data = i._data;
    }

    bool operator < (const acc_sample &rhs) {
        return _data._value < rhs._data._value;
    }

    bool operator > (const acc_sample &rhs) {
        return _data._value > rhs._data._value;
    }

    bool operator == (const acc_sample &rhs) {
        return _data._value == rhs._data._value;
    }

    bool operator != (const acc_sample &rhs) {
        return _data._value != rhs._data._value;
    }
};

int
main(int argc, char *argv[]) {
#if 0
    acc_sample s1(10, 100);
    acc_sample s2(11, 101);
    acc_sample s3(12, 102);

    if (s1 == s1)
        cout << "==" << endl;
    if (s1 < s2)
        cout << "<" << endl;
    if (s2 > s1)
        cout << ">" << endl;
#endif
    accumulator_set< acc_sample, features< tag::min > > acc;

    return 0;
}

// Ends here



----- Original Message ----
> From: Eric Niebler <eric_at_[hidden]>
> To: boost-users_at_[hidden]
> Sent: Wednesday, 25 February, 2009 10:37:42 AM
> Subject: Re: [Boost-users] [accumulators] Help required for using UDT as Sample
> 
> dhruva wrote:
> > I have my own data type, time stamp and value. I would like to get the min 
> Sample with corresponding time stamp.
> > 
> > class time_val {
> > public:
> >   time_t _time;
> >   double _value;
> > 
> > /* I have overloaded operators: <, >, ==, != */
> > /* Have provided copy constructor */
> > };
> > 
> > When I try:
> > accumulator_set< time_val, features > acc;
> > 
> > I get a whole lot of compilation errors. Is there any way I can make a UDT as 
> a sample?
> 
> That should just work. Can you provide a complete example?
> 
> -- Eric Niebler
> BoostPro Computing
> http://www.boostpro.com
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://listarchives.boost.org/mailman/listinfo.cgi/boost-users



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