Re: help with c++ sample in flex 2.5.11

[Bernd Prager]

> ----- Original Message -----
> From: "W. L. Estes" <address@hidden>
> ...
>
> > On Tuesday, 13 August 2002,13:53 -0400, Bernd Prager wrote:
> >
> > > I'm trying to make the c++ example from the doc working.
> >
> > You have put the @samp{*}  in your code. that is not what you
> > want. See the compiler's reference to line 28.
> >
> > --Will
>
> Sorry, you're right. I missed that.
> But I'm still not successful.
> Corrected the code to:
> ---------- test.l --------------------------
> %{
> #include <iostream>
> using std::cout;
> using std::endl;
>
> int mylineno = 0;
> %}
>
> string  \"[^\n"]+\"
>
> ws      [ \t]+
>
> alpha   [A-Za-z]
> dig     [0-9]
> name    ({alpha}|{dig}|\$)({alpha}|{dig}|[_.\-/$])*
> num1    [-+]?{dig}+\.?([eE][-+]?{dig}+)?
> num2    [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)?
> number  {num1}|{num2}
>
> %%
>
> {ws}    /* skip blanks and tabs */
>
> "/*"    {
>    int c;
>
>    while((c = yyinput()) != 0)
>    {
>       if(c == '\n')
>          ++mylineno;
>
>       else if(c == '*')
>       {
>          if((c = yyinput()) == '/')
>             break;
>          else
>             unput(c);
>       }
>    }
> }
>
> {number}  cout  << "number "  << YYText()   << endl;
>
> \n        mylineno++;
>
> {name}    cout  << "name "  << YYText()  << endl;
>
> {string}  cout  << "string "  << YYText()  << endl;
>
> %%
>
> int main( int /* argc */, char** /* argv */ )
> {
>    FlexLexer* lexer = new yyFlexLexer;
>    while(lexer->yylex() != 0)
>       ;
>    return 0;
> }
> ------ end test.l --------------------------

Sorry, forgot the -+ option. This is the correct error code:

--------- snip --------------------------------
test.tab.cc:1107:19: cunistd: No such file or directory
test.tab.cc: In member function `virtual int yyFlexLexer::yylex()':
test.tab.cc:1496: `yywrap' undeclared (first use this function)
test.tab.cc:1496: (Each undeclared identifier is reported only once for each
   function it appears in.)
test.tab.cc: In function `int yylex_destroy()':
test.tab.cc:2409: `yy_current_buffer' undeclared (first use this function)
test.tab.cc:2409: `yy_delete_buffer' undeclared (first use this function)
make: *** [test] Error 1
--------- snip --------------------------------