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

24 Feb 2009


      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@boost-consulting.com>
To: boost-users@lists.boost.org
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
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