Nonterminals

Notation

Attr: Synthesized attribute. The rule return type.
ID: The rule ID
r, r2: Rules
r_def, r2_def: A rule definition. By convention a rule named r should have corresponding rule definition named r_def
p: A parser expression

Expression	Description
`rule<ID, Attr> const r = name;`	Rule declaration. `ID` is required. `Attr` is optional and defaults to `unused_type`. `name` is an optional string that gives the rule its name, useful for debugging and error handling.
`r.name()`	Getting the name of a rule
`auto const r_def = p;`	Rule definition
`BOOST_SPIRIT_DEFINE(r, r2, ...)`	Links one or more rules (`r, r2, ...`) with their definitions (`r_def, r2_def, ...`)

Boost C++ Libraries