1 files changed, 171 insertions, 0 deletions
diff --git a/xbmc/interfaces/legacy/CallbackFunction.h b/xbmc/interfaces/legacy/CallbackFunction.h
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+++ b/xbmc/interfaces/legacy/CallbackFunction.h
@@ -0,0 +1,171 @@
+/*
+ *  Copyright (C) 2005-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#include "AddonClass.h"
+
+namespace XBMCAddon
+{
+  /**
+   * <p>This is the parent class for the class templates that hold
+   *   a callback. A callback is essentially a templatized
+   *   functor (functoid?) for a call to a member function.</p>
+   *
+   * <p>This class combined with the attending CallbackHandlers should make
+   *  sure that the AddonClass isn't in the midst of deallocating when
+   *  the callback executes. In this way the Callback class acts as
+   *  a weak reference.</p>
+   */
+  class Callback : public AddonClass
+  {
+  protected:
+    AddonClass* addonClassObject;
+    explicit Callback(AddonClass* _object) : addonClassObject(_object) { XBMC_TRACE; }
+
+  public:
+    virtual void executeCallback() = 0;
+    ~Callback() override;
+
+    AddonClass* getObject() { XBMC_TRACE; return addonClassObject; }
+  };
+
+  struct cb_null_type {};
+
+  // stub type template to be partial specialized
+  template<typename M = cb_null_type, typename T1 = cb_null_type,
+           typename T2 = cb_null_type, typename T3 = cb_null_type,
+           typename T4 = cb_null_type, typename Extraneous = cb_null_type>
+  class CallbackFunction {};
+
+  /**
+   * This is the template to carry a callback to a member function
+   *  that returns 'void' (has no return) and takes no parameters.
+   */
+  template<class M> class CallbackFunction<M, cb_null_type, cb_null_type, cb_null_type, cb_null_type, cb_null_type> : public Callback
+  {
+  public:
+    typedef void (M::*MemberFunction)();
+
+  protected:
+    MemberFunction meth;
+    M* obj;
+
+  public:
+    CallbackFunction(M* object, MemberFunction method) :
+      Callback(object), meth(method), obj(object) { XBMC_TRACE; }
+
+    ~CallbackFunction() override { XBMC_TRACE; deallocating(); }
+
+    void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(); }
+  };
+
+  /**
+   * This is the template to carry a callback to a member function
+   *  that returns 'void' (has no return) and takes one parameter.
+   */
+  template<class M, typename P1> class CallbackFunction<M,P1, cb_null_type, cb_null_type, cb_null_type, cb_null_type> : public Callback
+  {
+  public:
+    typedef void (M::*MemberFunction)(P1);
+
+  protected:
+    MemberFunction meth;
+    M* obj;
+    P1 param;
+
+  public:
+    CallbackFunction(M* object, MemberFunction method, P1 parameter) :
+      Callback(object), meth(method), obj(object),
+      param(parameter) { XBMC_TRACE; }
+
+    ~CallbackFunction() override { XBMC_TRACE; deallocating(); }
+
+    void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(param); }
+  };
+
+  /**
+   * This is the template to carry a callback to a member function
+   *  that returns 'void' (has no return) and takes one parameter
+   *  that can be held in an AddonClass::Ref
+   */
+  template<class M, typename P1> class CallbackFunction<M,AddonClass::Ref<P1>, cb_null_type, cb_null_type, cb_null_type, cb_null_type> : public Callback
+  {
+  public:
+    typedef void (M::*MemberFunction)(P1*);
+
+  protected:
+    MemberFunction meth;
+    M* obj;
+    AddonClass::Ref<P1> param;
+
+  public:
+    CallbackFunction(M* object, MemberFunction method, P1* parameter) :
+      Callback(object), meth(method), obj(object),
+      param(parameter) { XBMC_TRACE; }
+
+    ~CallbackFunction() override { XBMC_TRACE; deallocating(); }
+
+    void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(param); }
+  };
+
+
+  /**
+   * This is the template to carry a callback to a member function
+   *  that returns 'void' (has no return) and takes two parameters.
+   */
+  template<class M, typename P1, typename P2> class CallbackFunction<M,P1,P2, cb_null_type, cb_null_type, cb_null_type> : public Callback
+  {
+  public:
+    typedef void (M::*MemberFunction)(P1,P2);
+
+  protected:
+    MemberFunction meth;
+    M* obj;
+    P1 param1;
+    P2 param2;
+
+  public:
+    CallbackFunction(M* object, MemberFunction method, P1 parameter, P2 parameter2) :
+      Callback(object), meth(method), obj(object),
+      param1(parameter), param2(parameter2) { XBMC_TRACE; }
+
+    ~CallbackFunction() override { XBMC_TRACE; deallocating(); }
+
+    void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(param1,param2); }
+  };
+
+
+  /**
+   * This is the template to carry a callback to a member function
+   *  that returns 'void' (has no return) and takes three parameters.
+   */
+  template<class M, typename P1, typename P2, typename P3> class CallbackFunction<M,P1,P2,P3, cb_null_type, cb_null_type> : public Callback
+  {
+  public:
+    typedef void (M::*MemberFunction)(P1,P2,P3);
+
+  protected:
+    MemberFunction meth;
+    M* obj;
+    P1 param1;
+    P2 param2;
+    P3 param3;
+
+  public:
+    CallbackFunction(M* object, MemberFunction method, P1 parameter, P2 parameter2, P3 parameter3) :
+      Callback(object), meth(method), obj(object),
+      param1(parameter), param2(parameter2), param3(parameter3) { XBMC_TRACE; }
+
+    ~CallbackFunction() override { XBMC_TRACE; deallocating(); }
+
+    void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(param1,param2,param3); }
+  };
+}
+
+