Make destructors virtual as appropriate.

3 files changed, 4 insertions, 0 deletions

diff --git a/src/drumkitparser.h b/src/drumkitparser.h
index 444b459..cc1b3d6 100644
--- a/src/drumkitparser.h
+++ b/src/drumkitparser.h
@@ -35,6 +35,7 @@ class DrumKitParser
 {
 public:
 	DrumKitParser(Settings& setting, DrumKit& kit, Random& rand);
+	virtual ~DrumKitParser() = default;
 
 	virtual int parseFile(const std::string& filename) override;
 
diff --git a/src/inputfilter.h b/src/inputfilter.h
index 26f7294..45dd01e 100644
--- a/src/inputfilter.h
+++ b/src/inputfilter.h
@@ -32,6 +32,8 @@
 class InputFilter
 {
 public:
+	virtual ~InputFilter() = default;
+
 	//! Implement to filter a single event.
 	//! \param[in,out] event The event being processed. The filter method
 	//!  might alter any of the event parameters.
diff --git a/src/instrumentparser.h b/src/instrumentparser.h
index 793bfb6..512f12f 100644
--- a/src/instrumentparser.h
+++ b/src/instrumentparser.h
@@ -37,6 +37,7 @@ class InstrumentParser
 {
 public:
 	InstrumentParser(Instrument &instrument);
+	virtual ~InstrumentParser() = default;
 
 	virtual int parseFile(const std::string& filename) override;