Add virtual destructor for abstract classes

include/CacheBase.h

@@ -109,6 +109,7 @@ namespace openshot {
 		virtual void SetJson(string value) = 0; ///< Load JSON string into this object
 		virtual Json::Value JsonValue() = 0; ///< Generate Json::JsonValue for this object
 		virtual void SetJsonValue(Json::Value root) = 0; ///< Load Json::JsonValue into this object
+		virtual ~CacheBase() = default;
 
 	};
 

include/ClipBase.h

@@ -101,6 +101,7 @@ namespace openshot {
 		/// of all properties at any time)
 		virtual string PropertiesJSON(int64_t requested_frame) = 0;
 
+		virtual ~ClipBase() = default;
 	};
 
 

include/EffectBase.h

@@ -105,6 +105,7 @@ namespace openshot
 
 		/// Set the order that this effect should be executed.
 		void Order(int new_order) { order = new_order; }
+		virtual ~EffectBase() = default;
 	};
 
 }

include/PlayerBase.h

@@ -104,6 +104,7 @@ namespace openshot
 		/// Set the Volume (1.0 = normal volume, <1.0 = quieter, >1.0 louder)
 		virtual void Volume(float new_volume) = 0;
 
+		virtual ~PlayerBase() = default;
 	};
 
 }

include/ReaderBase.h

@@ -147,6 +147,8 @@ namespace openshot
 
 		/// Open the reader (and start consuming resources, such as images or video files)
 		virtual void Open() = 0;
+
+		virtual ~ReaderBase() = default;
 	};
 
 }

include/WriterBase.h

@@ -116,6 +116,8 @@ namespace openshot
 
 		/// Open the writer (and start initializing streams)
 		virtual void Open() = 0;
+
+		virtual ~WriterBase() = default;
 	};
 
 }