(bison.info.gz) Multiple Types

 
 More Than One Value Type
 ------------------------
 
    In most programs, you will need different data types for different
 kinds of tokens and groupings.  For example, a numeric constant may
 need type `int' or `long', while a string constant needs type `char *',
 and an identifier might need a pointer to an entry in the symbol table.
 
    To use more than one data type for semantic values in one parser,
 Bison requires you to do two things:
 
    * Specify the entire collection of possible data types, with the
      `%union' Bison declaration ( The Collection of Value Types
      Union Decl.).
 
    * Choose one of those types for each symbol (terminal or
      nonterminal) for which semantic values are used.  This is done for
      tokens with the `%token' Bison declaration ( Token Type
      Names Token Decl.)  and for groupings with the `%type' Bison
      declaration ( Nonterminal Symbols Type Decl.).

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(bison.info.gz) Value Type

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