zip_view

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### zip_view

##### Description

`zip_view` presents a view which iterates over a collection of Sequence(s) in parallel. A `zip_view` is constructed from a Sequence of references to the component __sequence__s.

##### Header

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

##### Synopsis

    template <typename Sequences>
    struct zip_view;

##### Template parameters

Parameter | Description | Default
--- | --- | ---
`Sequences` | A Forward Sequence of references to other Fusion __sequence__s |

##### Model of

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

Notation

`ZV`

  A `zip_view` type

`s`

  An instance of `Sequences`

`zv1`, `zv2`

  Instances of `ZV`

##### Expression Semantics

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

Expression | Semantics
--- | ---
`ZV(s)` | Creates a `zip_view` given a sequence of references to the component __sequence__s.
`ZV(zv1)` | Copy constructs a `zip_view` from another `zip_view`, `zv`.
`zv1 = zv2` | Assigns to a `zip_view`, `zv`, from another `zip_view`, `zv2`.

##### Example

    typedef vector<int,int> vec1;
    typedef vector<char,char> vec2;
    vec1 v1(1,2);
    vec2 v2('a','b');
    typedef vector<vec1&, vec2&> sequences;
    std::cout << zip_view<sequences>(sequences(v1, v2)) << std::endl; // ((1 a) (2 b))