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#### Parser Semantic Actions

Has the form:

    p[f]

where `f` is a function with the signatures:

    void f(Attrib const&);
    void f(Attrib const&, Context&);
    void f(Attrib const&, Context&, bool&);

You can use Boost.Bind to bind member functions. For function objects, the allowed signatures are:

    void operator()(Attrib const&, unused_type, unused_type) const;
    void operator()(Attrib const&, Context&, unused_type) const;
    void operator()(Attrib const&, Context&, bool&) const;

The `unused_type` is used in the signatures above to signify 'don't care'.

For more detailed information about semantic actions see: here.