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#### Local Variables

    #include <boost/phoenix/scope/local_variable.hpp>

We use an instance of:

    expression::local_variable<Key>::type

to represent a local variable. The local variable acts as an imaginary data-bin where a local, stack based data will be placed. `Key` is an arbitrary type that is used to identify the local variable. Example:

    struct size_key;
    expression::local_variable<size_key>::type size;

Predefined Local Variables

There are a few predefined instances of `expression::local_variable<Key>::type` named `_a`..`_z` that you can already use. To make use of them, simply use the `namespace boost::phoenix::local_names`:

    using namespace boost::phoenix::local_names;