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#### Common Notation

Notation

`G`

  Generator type

`g, a, b, c, d`

  Generator objects

`A, B, C, D`

  Attribute types of generators `a`, `b`, `c`, and `d`

`I`

  The iterator type used for generation

`Unused`

  An `unused_type`

`Context`

  The enclosing rule's `Context` type

`attrib`

  An attribute value

`Attrib`

  An attribute type

`b`

  A boolean expression

`B`

  A type to be interpreted in boolean expressions

`fg`

  A (lazy generator) function with signature `G(Unused, Context)`

`fa`

  A (semantic action) function with signature `void(Attrib&, Context, bool&)`. The third parameter is a boolean flag that can be set to false to force the generator to fail. Both `Context` and the boolean flag are optional.

`outiter`

  An output iterator to receive the generated output

`Ch`

  Character-class specific character type (See Character Class Types)

`ch, ch2`

  Character-class specific character (See Character Class Types)

`charset`

  Character-set specifier string (example: `"a-z0-9"`)

`str`

  Character-class specific string (See Character Class Types)

`Str`

  Attribute of `str`: `std::basic_string<T>` where `T` is the underlying character type of `str`

`num`

  Numeric literal, any integer or real number type

`Num`

  Attribute of `num`: any integer or real number type

`tuple<>`

  Used as a placeholder for a fusion sequence

`vector<>`

  Used as a placeholder for an STL container

`variant<>`

  Used as a placeholder for a boost::variant

`optional<>`

  Used as a placeholder for a boost::optional