annotate base/Extents.h @ 1833:21c792334c2e sensible-delimited-data-strings

Rewrite all the DelimitedDataString stuff so as to return vectors of individual cell strings rather than having the classes add the delimiters themselves. Rename accordingly to names based on StringExport. Take advantage of this in the CSV writer code so as to properly quote cells that contain delimiter characters.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef SV_EXTENTS_H
#define SV_EXTENTS_H

#include <vector>

/**
 * Maintain a min and max value, and update them when supplied a new
 * data point.
 */
template <typename T>
class Extents
{
public:
    Extents() : m_min(T()), m_max(T()) { }
    Extents(T min, T max) : m_min(min), m_max(max) { }
    
    bool operator==(const Extents &r) {
        return r.m_min == m_min && r.m_max == m_max;
    }
    bool operator!=(const Extents &r) {
        return !(*this == r);
    }
    
    bool isSet() const {
        return (m_min != T() || m_max != T());
    }
    void set(T min, T max) {
        m_min = min;
        m_max = max;
        if (m_max < m_min) m_max = m_min;
    }
    void reset() {
        m_min = T();
        m_max = T();
    }

    bool sample(T f) {
        bool changed = false;
        if (isSet()) {
            if (f < m_min) { m_min = f; changed = true; }
            if (f > m_max) { m_max = f; changed = true; }
        } else {
            m_max = m_min = f;
            changed = true;
        }
        return changed;
    }
    bool sample(const std::vector<T> &ff) {
        bool changed = false;
        for (auto f: ff) {
            if (sample(f)) {
                changed = true;
            }
        }
        return changed;
    }
    bool sample(const Extents &r) {
        bool changed = false;
        if (isSet()) {
            if (r.m_min < m_min) { m_min = r.m_min; changed = true; }
            if (r.m_max > m_max) { m_max = r.m_max; changed = true; }
        } else {
            m_min = r.m_min;
            m_max = r.m_max;
            changed = true;
        }
        return changed;
    }            

    T getMin() const { return m_min; }
    T getMax() const { return m_max; }

private:
    T m_min;
    T m_max;
};

#endif