Index: src/libictranslate/cfg.h
===================================================================
diff -u -N -r4fe995b304ea342b50293f92d3c1992b43b820f7 -r8068e0c351055554340ac9755d1bc846893bf2b8
--- src/libictranslate/cfg.h	(.../cfg.h)	(revision 4fe995b304ea342b50293f92d3c1992b43b820f7)
+++ src/libictranslate/cfg.h	(.../cfg.h)	(revision 8068e0c351055554340ac9755d1bc846893bf2b8)
@@ -145,15 +145,15 @@
 
 	// setting property data
 	/// Sets the value from the string
-	void set_value(unsigned int uiProp, const wchar_t* pszVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=NULL);
+	void set_value(unsigned int uiProp, const wchar_t* pszVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=nullptr);
 	/// Sets the value of longlong_t-type property
-	void set_signed_num(unsigned int uiProp, long long llVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=NULL);
+	void set_signed_num(unsigned int uiProp, long long llVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=nullptr);
 	/// Sets the value of ulonglong_t-type property
-	void set_unsigned_num(unsigned int uiProp, unsigned long long ullVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=NULL);
+	void set_unsigned_num(unsigned int uiProp, unsigned long long ullVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=nullptr);
 	/// Sets the value of bool-type property
-	void set_bool(unsigned int uiProp, bool bVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=NULL);
+	void set_bool(unsigned int uiProp, bool bVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=nullptr);
 	/// Sets the value of string-type property
-	void set_string(unsigned int uiProp, const wchar_t* pszVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=NULL);
+	void set_string(unsigned int uiProp, const wchar_t* pszVal, property::actions a=property::action_replace, size_t tIndex=0, property_tracker* pTracker=nullptr);
 	/// Sets the string manually, without using registered properties; does not notify about change.
 	void set_string(const wchar_t* pszName, const wchar_t* pszVal, property::actions a=property::action_replace);
 /**@}*/