iterator_range

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### iterator_range

#### Description

`iterator_range` presents a sub-range of its underlying sequence delimited by a pair of iterators.

#### Header

    #include <boost/fusion/view/iterator_range.hpp>
    #include <boost/fusion/include/iterator_range.hpp>

#### Synopsis

    template <typename First, typename Last>
    struct iterator_range;

#### Template parameters

Parameter | Description | Default
--- | --- | ---
`First` | A fusion Iterator |
`Last` | A fusion Iterator |

#### Model of

- Forward Sequence, Bidirectional Sequence or Random Access Sequence depending on the traversal characteristics (see Sequence Traversal Concept) of its underlying sequence.

Notation

`IR`

  An `iterator_range` type

`f`

  An instance of `First`

`l`

  An instance of `Last`

`ir`, `ir2`

  Instances of `iterator_range`

#### Expression Semantics

Semantics of an expression is defined only where it differs from, or is not defined in Forward Sequence.

Expression | Semantics
--- | ---
`IR(f, l)` | Creates an `iterator_range` given iterators, `f` and `l`.
`IR(ir)` | Copy constructs an `iterator_range` from another `iterator_range`, `ir`.
`ir = ir2` | Assigns to a `iterator_range`, `ir`, from another `iterator_range`, `ir2`.

#### Example

    char const* s = "Ruby";
    typedef vector<int, char, double, char const*> vector_type;
    vector_type vec(1, 'x', 3.3, s);

    typedef result_of::begin<vector_type>::type A;
    typedef result_of::end<vector_type>::type B;
    typedef result_of::next<A>::type C;
    typedef result_of::prior<B>::type D;

    C c(vec);
    D d(vec);

    iterator_range<C, D> range(c, d);
    std::cout << range << std::endl;