irange

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#### irange

###### Prototype

    template<class Integer>
    iterator_range< range_detail::integer_iterator<Integer> >
    irange(Integer first, Integer  last);

    template<class Integer, class StepSize>
    iterator_range< range_detail::integer_iterator_with_step<Integer, StepSize> >
    irange(Integer first, Integer last, StepSize step_size);

###### Description

`irange` is a function to generate an Integer Range.

`irange` allows treating integers as a model of the Random Access Range Concept. It should be noted that the `first` and `last` parameters denoted a half-open range.

###### Definition

Defined in the header file `boost/range/irange.hpp`

###### Requirements

1. `Integer` is a model of the `Integer` Concept.
2. `StepSize` is a model of the `SignedInteger` Concept.

###### Complexity

Constant. Since this function generates a new range the most significant performance cost is incurred through the iteration of the generated range.