Introduce (and use) an IsArgSet accessor method

src/util.h

@@ -123,6 +123,14 @@ inline bool IsSwitchChar(char c)
 #endif
 }
 
+/**
+ * Return true if the given argument has been manually set
+ *
+ * @param strArg Argument to get (e.g. "-foo")
+ * @return true if the argument has been set
+ */
+bool IsArgSet(const std::string& strArg);
+
 /**
  * Return string argument or default value
  *