3rdParty/boost/1.78.0/libs/mpl/doc/refmanual/zip-view.html
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template<
typename[Sequences](./sequences.html)>
struct[zip\_view](./zip-view.html){
//_unspecified_//_..._};
Provides a "zipped" view onto several sequences; that is, represents several sequences as a single sequence of elements each of which, in turn, is a sequence of the corresponding Sequences' elements.
#include <[boost/mpl/zip\_view.hpp](../../../../boost/mpl/zip_view.hpp)>
| Parameter | Requirement | Description |
|---|---|---|
| Sequences | A Forward Sequence of Forward Sequences | Sequences to be "zipped". |
The semantics of an expression are defined only where they differ from, or are not defined in Forward Sequence.
In the following table, v is an instance of zip_view, seq a Forward Sequence of nForward Sequences.
| Expression | Semantics |
|---|---|
[zip\_view](./zip-view.html)<seq>[zip\_view](./zip-view.html)<seq>::type
| A lazy Forward Sequence v such that for each i in [begin<v>::type, end<v>::type) and for each j in [begin<seq>::type, end<seq>::type) deref<i>::type is identical to transform< deref<j>::type, deref<_1> >::type. | | size<v>::type |
The size of v; size<v>::value is equal to
[deref](./deref.html)<[min\_element](./min-element.html)<[transform\_view](./transform-view.html)< seq,[size](./size.html)<[\_1](./placeholders.html)> >
>::type >::type::value;
linear complexity; see Forward Sequence.
|
Element-wise sum of three vectors.
typedef[vector\_c](./vector-c.html)<int,1,2,3,4,5> v1;
typedef[vector\_c](./vector-c.html)<int,5,4,3,2,1> v2;
typedef[vector\_c](./vector-c.html)<int,1,1,1,1,1> v3;
typedef[transform\_view](./transform-view.html)<[zip\_view](./zip-view.html)<[vector](./vector.html)<v1,v2,v3> >
,[unpack\_args](./unpack-args.html)<[plus](./plus.html)<[\_1](./placeholders.html),[\_2](./placeholders.html),[\_3](./placeholders.html)> >
> sum;[BOOST\_MPL\_ASSERT](./assert.html)(([equal](./equal.html)< sum,[vector\_c](./vector-c.html)<int,7,7,7,7,7> > ));
Sequences, Views, filter_view, transform_view, joint_view, single_view, iterator_range
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Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |