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-rw-r--r--src/common/interface/PortType.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/common/interface/PortType.hpp b/src/common/interface/PortType.hpp
index e1d51e21..19558adc 100644
--- a/src/common/interface/PortType.hpp
+++ b/src/common/interface/PortType.hpp
@@ -68,6 +68,7 @@ public:
inline bool operator!=(const Symbol& symbol) const { return (_symbol != symbol); }
inline bool operator==(const PortType& type) const { return (_symbol == type._symbol); }
inline bool operator!=(const PortType& type) const { return (_symbol != type._symbol); }
+ inline bool operator<(const PortType& type) const { return (_symbol < type._symbol); }
inline bool is_audio() { return _symbol == AUDIO; }
inline bool is_control() { return _symbol == CONTROL; }