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diff --git a/src/base/TriggerSegment.h b/src/base/TriggerSegment.h
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+// -*- c-basic-offset: 4 -*-
+
+/*
+    Rosegarden
+    A sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+
+    The moral right of the authors to claim authorship of this work
+    has been asserted.
+
+    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 _TRIGGER_SEGMENT_H_
+#define _TRIGGER_SEGMENT_H_
+
+#include <set>
+#include <string>
+
+namespace Rosegarden
+{
+
+typedef unsigned int TriggerSegmentId;
+
+class Segment;
+
+class TriggerSegmentRec
+{       
+public:
+    typedef std::set<int> SegmentRuntimeIdSet;
+    ~TriggerSegmentRec();
+    TriggerSegmentRec(const TriggerSegmentRec &);
+    TriggerSegmentRec &operator=(const TriggerSegmentRec &);
+    bool operator==(const TriggerSegmentRec &rec) { return rec.m_id == m_id; }
+
+    TriggerSegmentId getId() const { return m_id; }
+
+    Segment *getSegment() { return m_segment; }
+    const Segment *getSegment() const { return m_segment; }
+
+    int getBasePitch() const { return m_basePitch; }
+    void setBasePitch(int basePitch) { m_basePitch = basePitch; }
+
+    int getBaseVelocity() const { return m_baseVelocity; }
+    void setBaseVelocity(int baseVelocity) { m_baseVelocity = baseVelocity; }
+
+    std::string getDefaultTimeAdjust() const { return m_defaultTimeAdjust; }
+    void setDefaultTimeAdjust(std::string a) { m_defaultTimeAdjust = a; }
+    
+    bool getDefaultRetune() const { return m_defaultRetune; }
+    void setDefaultRetune(bool r) { m_defaultRetune = r; }
+
+    SegmentRuntimeIdSet &getReferences() { return m_references; }
+    const SegmentRuntimeIdSet &getReferences() const { return m_references; }
+
+    void updateReferences();
+
+protected:
+    friend class Composition;
+    TriggerSegmentRec(TriggerSegmentId id, Segment *segment,
+                      int basePitch = -1, int baseVelocity = -1,
+                      std::string defaultTimeAdjust = "", bool defaultRetune = true);
+
+    void setReferences(const SegmentRuntimeIdSet &s) { m_references = s; }
+
+    void calculateBases();
+
+    // data members:
+
+    TriggerSegmentId     m_id;
+    Segment             *m_segment;
+    int                  m_basePitch;
+    int                  m_baseVelocity;
+    std::string          m_defaultTimeAdjust;
+    bool                 m_defaultRetune;
+    SegmentRuntimeIdSet  m_references;
+};
+  
+struct TriggerSegmentCmp
+{
+    bool operator()(const TriggerSegmentRec &r1, const TriggerSegmentRec &r2) const {
+        return r1.getId() < r2.getId();
+    }
+    bool operator()(const TriggerSegmentRec *r1, const TriggerSegmentRec *r2) const {
+        return r1->getId() < r2->getId();
+    }
+};
+
+
+}
+  
+#endif