// Copyright 2017 Google Inc. All Rights Reserved.
//
// This file contains the definitions for the Distribution class members.

#include "distribution.h"

#include <float.h>

namespace wvcdm {
namespace metrics {

Distribution::Distribution() :
    count_(0LL),
    min_(DBL_MAX),
    max_(-DBL_MAX),
    mean_(0.0),
    sum_squared_deviation_(0.0) {
}

void Distribution::Record(double value) {
  // Using method of provisional means.
  double deviation = value - mean_;
  mean_ = mean_ + (deviation / ++count_);
  sum_squared_deviation_ =
     sum_squared_deviation_ + (deviation * (value - mean_));

  min_ = min_ < value ? min_ : value;
  max_ = max_ > value ? max_ : value;
}

}  // namespace metrics
}  // namespace wvcdm