(flex.info.gz) How do I execute code only during initialization (only before the first scan)?

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(flex.info.gz) How do I execute code at termination?

 
 How do I execute code only during initialization (only before the first scan)?
 ==============================================================================
 
 You can specify an initial action by defining the macro `YY_USER_INIT'
 (though note that `yyout' may not be available at the time this macro
 is executed).  Or you can add to the beginning of your rules section:
 
 
      %%
          /* Must be indented! */
          static int did_init = 0;
 
          if ( ! did_init ){
      do_my_init();
              did_init = 1;
          }
 

Info Catalog

(flex.info.gz) How do I abandon a file in the middle of a scan and switch to a new file?

(flex.info.gz) FAQ

(flex.info.gz) How do I execute code at termination?