add defer macros

projects/kiwano/kiwano.vcxproj

@@ -23,6 +23,7 @@
     <ClInclude Include="..\..\src\kiwano\core\Any.h" />
     <ClInclude Include="..\..\src\kiwano\core\Cloneable.h" />
     <ClInclude Include="..\..\src\kiwano\core\Common.h" />
+    <ClInclude Include="..\..\src\kiwano\core\Defer.h" />
     <ClInclude Include="..\..\src\kiwano\core\Exception.h" />
     <ClInclude Include="..\..\src\kiwano\core\Function.h" />
     <ClInclude Include="..\..\src\kiwano\core\IntrusiveList.h" />

projects/kiwano/kiwano.vcxproj.filters

@@ -354,6 +354,9 @@
     <ClInclude Include="..\..\src\kiwano\base\ObjectPool.h">
       <Filter>base</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\kiwano\core\Defer.h">
+      <Filter>core</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\..\src\kiwano\2d\Canvas.cpp">

src/kiwano/core/Defer.h

@@ -0,0 +1,69 @@
+// Copyright (c) 2016-2018 Kiwano - Nomango
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#pragma once
+#include <kiwano/core/Function.h>
+
+namespace kiwano
+{
+
+class Defer
+{
+public:
+    Defer() = default;
+
+    Defer(const Function<void()>& func)
+        : func_(func)
+    {
+    }
+
+    Defer(Defer&& other) noexcept
+        : func_(other.func_)
+    {
+        other.func_ = nullptr;
+    }
+
+    ~Defer()
+    {
+        if (func_)
+            func_();
+    }
+
+private:
+    Defer(const Defer&) = delete;
+    Defer& operator=(const Defer&) = delete;
+
+    Function<void()> func_;
+};
+
+class __DeferHelper
+{
+public:
+    Defer operator-(const Function<void()>& func) const
+    {
+        return Defer{ func };
+    }
+};
+
+#define KGE_DEFER auto __KGE_DEFER_VAR(__defer_line_, __LINE__, __) = ::kiwano::__DeferHelper() -
+#define __KGE_DEFER_VAR(a, b, c) __KGE_DEFER_TOKEN_CONNECT(a, b, c)
+#define __KGE_DEFER_TOKEN_CONNECT(a, b, c) a##b##c
+
+}  // namespace kiwano

src/kiwano/kiwano.h

@@ -44,6 +44,7 @@
 //
 
 #include <kiwano/core/Common.h>
+#include <kiwano/core/Defer.h>
 #include <kiwano/core/Resource.h>
 #include <kiwano/core/SmartPtr.hpp>
 #include <kiwano/core/Time.h>

src/kiwano/platform/Application.cpp

@@ -19,11 +19,12 @@
 // THE SOFTWARE.
 
 #include <kiwano/platform/Application.h>
-#include <kiwano/utils/Logger.h>
+#include <kiwano/core/Defer.h>
 #include <kiwano/base/Director.h>
 #include <kiwano/render/Renderer.h>
 #include <kiwano/render/TextureCache.h>
 #include <kiwano/utils/ResourceCache.h>
+#include <kiwano/utils/Logger.h>
 
 namespace kiwano
 {
@@ -62,24 +63,11 @@ void Application::Run(RunnerPtr runner)
     }
 
     // Ensure resources are destroyed before exiting
-    class DestroyHelper
+    KGE_DEFER[=]()
     {
-        Function<void()> f;
-
-    public:
-        DestroyHelper(Function<void()> f)
-            : f(f)
-        {
-        }
-
-        ~DestroyHelper()
-        {
-            f();
-        }
+        this->Destroy();
     };
 
-    DestroyHelper helper([=]() { this->Destroy(); });
-
     // Everything is ready
     runner->OnReady();