v4 preprocessor/macro: a double at-sign (@@) can be used to output a single at-sign (@); useful for Matlab function handles

git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1747 ac1d8469-bf42-47a9-8791-bf33cf982152

macro/MacroFlex.ll

@@ -83,6 +83,9 @@ EOL  (\r)?\n
                               BEGIN(INITIAL);
                             }
 
+ /* Double at-sign gives a single at-sign in output: useful for Matlab function-handles */
+<INITIAL>@@                 { *yyout << '@'; }
+
 <INITIAL>@                  { BEGIN(MACRO); }
 
 <MACRO>{SPC}+               { yylloc->step(); }