Added a handy static method MessageManager::callAsync() which can asynchronously invoke a lambda on the message thread.

modules/juce_events/messages/juce_MessageManager.cpp

@@ -131,6 +131,22 @@ void MessageManager::stopDispatchLoop()
 #endif
 
 //==============================================================================
+struct AsyncFunction  : private MessageManager::MessageBase
+{
+    AsyncFunction (std::function<void(void)> f)  : fn (f)  { post(); }
+
+private:
+    std::function<void(void)> fn;
+    void messageCallback() override    { fn(); }
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AsyncFunction)
+};
+
+void MessageManager::callAsync (std::function<void(void)> f)
+{
+    new AsyncFunction (f);
+}
+
 class AsyncFunctionCallback   : public MessageManager::MessageBase
 {
 public:

modules/juce_events/messages/juce_MessageManager.h

@@ -91,6 +91,11 @@ public:
    #endif
 
     //==============================================================================
+    /** Asynchronously invokes a function or C++11 lambda on the message thread.
+        Internally this uses the CallbackMessage class to invoke the callback.
+    */
+    static void callAsync (std::function<void(void)>);
+
     /** Calls a function using the message-thread.
 
         This can be used by any thread to cause this function to be called-back