Added a showMenuAsync() method to PopupMenu that takes a std::function

modules/juce_gui_basics/menus/juce_PopupMenu.cpp

@@ -1677,6 +1677,11 @@ void PopupMenu::showMenuAsync (const Options& options, ModalComponentManager::Ca
     showWithOptionalCallback (options, userCallback, false);
 }
 
+void PopupMenu::showMenuAsync (const Options& options, std::function<void(int)> userCallback)
+{
+    showWithOptionalCallback (options, ModalCallbackFunction::create (userCallback), false);
+}
+
 //==============================================================================
 #if JUCE_MODAL_LOOPS_PERMITTED
 int PopupMenu::show (int itemIDThatMustBeVisible, int minimumWidth,

modules/juce_gui_basics/menus/juce_PopupMenu.h

@@ -502,6 +502,10 @@ public:
     void showMenuAsync (const Options& options,
                         ModalComponentManager::Callback* callback);
 
+    /** Runs the menu asynchronously, with a user-provided callback that will receive the result. */
+    void showMenuAsync (const Options& options,
+                        std::function<void(int)> callback);
+
     //==============================================================================
     /** Closes any menus that are currently open.