Median< T > Class Template Reference

#include <qtconcurrentmedian.h>

Class Description

template<typename T>
class QtConcurrent::Median< T >

Definition at line 62 of file qtconcurrentmedian.h.

Public Member Functions
	Median (int _bufferSize)
void	reset ()
void	addValue (T value)
bool	isMedianValid () const
T	median ()

Constructor & Destructor Documentation

Median ( int  _bufferSize )

inline

Definition at line 65 of file qtconcurrentmedian.h.

        : currentMedian(), bufferSize(_bufferSize), currentIndex(0), valid(false), dirty(true)
    {
        values.resize(bufferSize);
    }

Member Function Documentation

void reset ( )

inline

Definition at line 71 of file qtconcurrentmedian.h.

    {
        values.fill(0);
        currentIndex = 0;
        valid = false;
        dirty = true;
    }

void addValue ( T  value )

inline

Definition at line 79 of file qtconcurrentmedian.h.

    {
        currentIndex = ((currentIndex + 1) % bufferSize);
        if (valid == false && currentIndex % bufferSize == 0)
            valid = true;

        // Only update the cached median value when we have to, that
        // is when the new value is on then other side of the median
        // compared to the current value at the index.
        const T currentIndexValue = values[currentIndex];
        if ((currentIndexValue > currentMedian && currentMedian > value)
            || (currentMedian > currentIndexValue && value > currentMedian)) {
            dirty = true;
        }

        values[currentIndex] = value;
    }

bool isMedianValid ( ) const

inline

Definition at line 97 of file qtconcurrentmedian.h.

    {
        return valid;
    }

T median ( )

inline

Definition at line 102 of file qtconcurrentmedian.h.

    {
        if (dirty) {
            dirty = false;
            QVector<T> sorted = values;
            qSort(sorted);
            currentMedian = sorted.at(bufferSize / 2 + 1);
        }
        return currentMedian;
    }

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The documentation for this class was generated from the following file:

• QtCore/qtconcurrentmedian.h