fix #555: Use int for index in IEngine::broadcast()

Author: adazem009

include/scratchcpp/iengine.h

@@ -60,7 +60,7 @@ class LIBSCRATCHCPP_EXPORT IEngine
         virtual VirtualMachine *startScript(std::shared_ptr<Block> topLevelBlock, Target *) = 0;
 
         /*! Starts the scripts of the broadcast with the given index. */
-        virtual void broadcast(unsigned int index) = 0;
+        virtual void broadcast(int index) = 0;
 
         /*! Starts the scripts of the given broadcast. */
         virtual void broadcastByPtr(Broadcast *broadcast) = 0;

src/engine/internal/engine.cpp

@@ -415,7 +415,7 @@ VirtualMachine *Engine::startScript(std::shared_ptr<Block> topLevelBlock, Target
     return pushThread(topLevelBlock, target).get();
 }
 
-void Engine::broadcast(unsigned int index)
+void Engine::broadcast(int index)
 {
     if (index < 0 || index >= m_broadcasts.size())
         return;

src/engine/internal/engine.h

@@ -35,7 +35,7 @@ class Engine : public IEngine
         void start() override;
         void stop() override;
         VirtualMachine *startScript(std::shared_ptr<Block> topLevelBlock, Target *target) override;
-        void broadcast(unsigned int index) override;
+        void broadcast(int index) override;
         void broadcastByPtr(Broadcast *broadcast) override;
         void startBackdropScripts(Broadcast *broadcast) override;
         void stopScript(VirtualMachine *vm) override;

test/mocks/enginemock.h

@@ -17,7 +17,7 @@ class EngineMock : public IEngine
         MOCK_METHOD(void, start, (), (override));
         MOCK_METHOD(void, stop, (), (override));
         MOCK_METHOD(VirtualMachine *, startScript, (std::shared_ptr<Block>, Target *), (override));
-        MOCK_METHOD(void, broadcast, (unsigned int), (override));
+        MOCK_METHOD(void, broadcast, (int), (override));
         MOCK_METHOD(void, broadcastByPtr, (Broadcast *), (override));
         MOCK_METHOD(void, startBackdropScripts, (Broadcast *), (override));
         MOCK_METHOD(void, stopScript, (VirtualMachine *), (override));