+# If FIELD about symbol #NUM is 1 expand IF-TRUE, if is 0, expand IF-FALSE.
+# Otherwise an error.
+m4_define([b4_symbol_if],
+[m4_case(b4_symbol([$1], [$2]),
+ [1], [$3],
+ [0], [$4],
+ [m4_fatal([$0: field $2 of $1 is not a Boolean:] b4_symbol([$1], [$2]))])])
+
+
+# b4_symbol_actions(FILENAME, LINENO,
+# SYMBOL-TAG, SYMBOL-NUM,
+# SYMBOL-ACTION, SYMBOL-TYPENAME)
+# -------------------------------------------------
+# Same as in C, but using references instead of pointers.
+m4_define([b4_symbol_actions],
+[m4_pushdef([b4_dollar_dollar],
+ [b4_symbol_value_template([yysym.value], [$6])])dnl
+m4_pushdef([b4_at_dollar], [yysym.location])dnl
+ case $4: // $3
+b4_syncline([$2], [$1])
+ $5;
+b4_syncline([@oline@], [@ofile@])
+ break;
+m4_popdef([b4_at_dollar])dnl
+m4_popdef([b4_dollar_dollar])dnl
+])
+
+
+# b4_symbol_case_(SYMBOL-NUM)
+# ---------------------------
+# Issue a "case NUM" for SYMBOL-NUM.
+m4_define([b4_symbol_case_],
+[ case b4_symbol([$1], [number]): // b4_symbol([$1], [tag])
+])
+
+
+# b4_type_action_(NUMS)
+# ---------------------
+# Run actions for the symbol NUMS that all have the same type-name.
+# Skip NUMS that have no type-name.
+m4_define([b4_type_action_],
+[b4_symbol_if([$1], [has_type_name],
+[m4_map([b4_symbol_case_], [$@])[]dnl
+ b4_dollar_dollar([b4_symbol([$1], [number])],
+ [b4_symbol([$1], [tag])],
+ [b4_symbol([$1], [type_name])]);
+ break;
+
+])])
+
+
+# b4_symbol_constructor_declaration_(SYMBOL-NUMBERS)
+# ----------------------------------------------------
+# Declare the overloaded version of make_symbol for the (common) type of
+# these SYMBOL-NUMBERS. Use at class-level.
+m4_define([b4_symbol_constructor_declaration_],
+[ template <token_type>
+ static inline symbol_type
+ make_symbol (b4_symbol_if([$1], [has_type_name],
+ [const b4_symbol([$1], [type_name])& v, ])dnl
+const location_type& l);
+
+])
+
+# b4_symbol_constructor_declarations
+# ----------------------------------
+# Declare the overloaded versions of make_symbol for all the value types.
+# Use at class-level.
+m4_define([b4_symbol_constructor_declarations],
+[b4_variant_if([
+ // Declaration of make_symbol for each value type.
+m4_map([b4_symbol_constructor_declaration_], m4_defn([b4_type_names]))])])
+
+
+
+# b4_symbol_constructor_specialization_(SYMBOL-NUMBER)
+# ----------------------------------------------------
+# Declare the specialization of make_symbol for this each SYMBOL-NUMBER.
+# Specializations cannot be declared at class-level, this must be done
+# at namespace-level.
+m4_define([b4_symbol_constructor_specialization_],
+[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [tag_is_id],
+[ template <>
+ inline
+ b4_parser_class_name::symbol_type
+ b4_parser_class_name::make_symbol <b4_parser_class_name::token::b4_symbol([$1], [tag])> (dnl
+b4_symbol_if([$1], [has_type_name],
+ [const b4_symbol([$1], [type_name])& v, ])dnl
+const b4_parser_class_name::location_type& l);
+])])])
+
+# b4_symbol_constructor_specializations
+# -------------------------------------
+# Declare specializations of make_symbol.
+m4_define([b4_symbol_constructor_specializations],
+[b4_variant_if([
+ // Specializations of make_symbol for each symbol type.
+m4_map([b4_symbol_constructor_specialization_],
+ m4_defn([b4_symbol_numbers]))])dnl
+])
+
+
+
+# b4_symbol_constructor_definition_(SYMBOL-NUMBER)
+# ------------------------------------------------
+# Define make_symbol for this SYMBOL-NUMBER.
+m4_define([b4_symbol_constructor_definition_],
+[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [tag_is_id],
+[ template <>
+ b4_parser_class_name::symbol_type
+ b4_parser_class_name::make_symbol <b4_parser_class_name::token::b4_symbol([$1], [tag])> (dnl
+b4_symbol_if([$1], [has_type_name],
+ [const b4_symbol([$1], [type_name])& v, ])dnl
+const location_type& l)
+ {
+ return symbol_type (yytranslate_ (token::b4_symbol([$1], [tag])),dnl
+ b4_symbol_if([$1], [has_type_name], [v, ])l);
+ }
+
+])])])
+
+
+# b4_symbol_constructor_declarations
+# ----------------------------------
+# Define the overloaded versions of make_symbol for all the value types.
+m4_define([b4_symbol_constructor_definitions],
+[b4_variant_if(
+[ // Implementation of make_symbol for each symbol type.
+m4_map([b4_symbol_constructor_definition_], m4_defn([b4_symbol_numbers]))])])
+
+
+# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
+# ------------------------------------------------
+# Run some ACTION ("build", or "destroy") on YYVAL of symbol type
+# YYTYPE.
+m4_define([b4_symbol_variant],
+[m4_pushdef([b4_dollar_dollar],
+ [$2.$3<$][3>(m4_shift3($@))])dnl
+ switch ($1)
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