diff base/ById.h @ 1729:abd8b9673028 by-id

Experiment toward working out an id-model store

--- /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
+