Fix errors to support Xcode

include/tclap/Arg.h

@@ -214,7 +214,7 @@ class Arg
 		 * The char used as a place holder when SwitchArgs are combined.
 		 * Currently set to the bell char (ASCII 7).
 		 */
-		static char blankChar() { return (char)7; }
+		static char blankChar() { return static_cast<char>(7); }
 
 		/**
 		 * The char that indicates the beginning of a flag.  Defaults to '-', but

include/tclap/ArgException.h

@@ -53,10 +53,6 @@ class ArgException : public std::exception
 			  _typeDescription(td)
 		{ } 
 		
-		/**
-		 * Destructor.
-		 */
-		virtual ~ArgException() throw() { }
 
 		/**
 		 * Returns the error text.
@@ -77,7 +73,7 @@ class ArgException : public std::exception
 		/**
 		 * Returns the arg id and error text. 
 		 */
-		const char* what() const throw() 
+		const char* what() const noexcept 
 		{
 			static std::string ex; 
 			ex = _argId + " -- " + _errorText;

include/tclap/ArgTraits.h

@@ -37,7 +37,6 @@ namespace TCLAP {
  */
 struct ValueLike {
     typedef ValueLike ValueCategory;
-	virtual ~ValueLike() {}
 };
 
 /**

include/tclap/CmdLine.h

@@ -137,7 +137,7 @@ class CmdLine : public CmdLineInterface
 		/**
 		 * Throws an exception listing the missing args.
 		 */
-		void missingArgsException();
+		[[ noreturn ]] void missingArgsException();
 
 		/**
 		 * Checks whether a name/flag string matches entirely matches
@@ -533,7 +533,7 @@ inline bool CmdLine::_emptyCombined(const std::string& s)
 	return true;
 }
 
-inline void CmdLine::missingArgsException()
+[[ noreturn ]] inline void CmdLine::missingArgsException()
 {
 		int count = 0;