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 Sequences.

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))