# HG changeset patch
# User Chris Cannam
# Date 1561039059 -3600
# Node ID abd8b9673028e9397d2bc78b57e7f29e601853c6
# Parent  8efce64dd85ec5669cf094df639996eddb0bc78f
Experiment toward working out an id-model store

diff -r 8efce64dd85e -r abd8b9673028 base/ById.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/ById.cpp	Thu Jun 20 14:57:39 2019 +0100
@@ -0,0 +1,33 @@
+/* -*- 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.
+*/
+
+#include "ById.h"
+
+#include <QMutex>
+
+#include <climits>
+
+int
+WithId::getNextId()
+{
+    static int nextId = 0;
+    static QMutex mutex;
+    QMutexLocker locker(&mutex);
+    int i = nextId;
+    if (nextId == INT_MAX) {
+        nextId = INT_MIN;
+    }
+    ++nextId;
+    return i;
+}
diff -r 8efce64dd85e -r abd8b9673028 base/ById.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/ById.h	Thu Jun 20 14:57:39 2019 +0100
@@ -0,0 +1,105 @@
+/* -*- 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_BY_ID_H
+#define SV_BY_ID_H
+
+#include <memory>
+#include <map>
+
+#include <QMutex>
+
+typedef int Id;
+
+class WithId
+{
+public:
+    WithId() :
+        m_id(getNextId()) {
+    }
+
+    Id getId() const {
+        return m_id;
+    }
+
+private:
+    Id m_id;
+    static int getNextId();
+};
+
+template <typename Item>
+class ById
+{
+public:
+    void add(std::shared_ptr<Item> item) {
+        QMutexLocker locker(&m_mutex);
+        m_items[item->getId()] = item;
+    }
+
+    void
+    release(Id id) {
+        QMutexLocker locker(&m_mutex);
+        m_items.erase(id);
+    }
+
+    std::shared_ptr<Item> get(Id id) const {
+        QMutexLocker locker(&m_mutex);
+        const auto &itr = m_items.find(id);
+        if (itr != m_items.end()) {
+            return itr->second;
+        } else {
+            return std::shared_ptr<Item>();
+        }
+    }
+
+    template <typename Derived>
+    std::shared_ptr<Derived> getAs(Id id) const {
+        return std::dynamic_pointer_cast<Derived>(get(id));
+    }
+    
+private:
+    mutable QMutex m_mutex;
+    std::map<Id, std::shared_ptr<Item>> m_items;
+};
+/*
+class Imagined : public WithId {
+};
+
+class ImaginedById
+{
+public:
+    static void add(std::shared_ptr<Imagined> imagined) {
+        m_byId.add(imagined);
+    }
+
+    static void release(Id id) {
+        m_byId.release(id);
+    }
+
+    static std::shared_ptr<Imagined> get(Id id) {
+        return m_byId.get(id);
+    }
+
+    template <typename Derived>
+    static
+    std::shared_ptr<Derived> getAs(Id id) {
+        return m_byId.getAs<Derived>(id);
+    }
+
+private:
+    static ById<Imagined> m_byId;
+};
+*/
+#endif
+
diff -r 8efce64dd85e -r abd8b9673028 files.pri
--- a/files.pri	Thu Jun 20 11:09:36 2019 +0100
+++ b/files.pri	Thu Jun 20 14:57:39 2019 +0100
@@ -3,6 +3,7 @@
            base/AudioPlaySource.h \
            base/AudioRecordTarget.h \
            base/BaseTypes.h \
+           base/ById.h \
            base/Clipboard.h \
            base/ColumnOp.h \
            base/Command.h \
@@ -149,6 +150,7 @@
 	   
 SVCORE_SOURCES = \
            base/AudioLevel.cpp \
+           base/ById.cpp \
            base/Clipboard.cpp \
            base/ColumnOp.cpp \
            base/Command.cpp \