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transform_view

Synopsis

template<
      typename Sequence
    , typename F
    >
struct[transform\_view](./transform-view.html){
    //_unspecified_//_..._};

Description

A view the full range of Sequence's transformed elements.

Header

#include <[boost/mpl/transform\_view.hpp](../../../../boost/mpl/transform_view.hpp)>

Model of

• Forward Sequence

Parameters

Expression semantics

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 transform_view, s is an arbitrary Forward Sequence, and f is an unary Lambda Expression.

[transform\_view](./transform-view.html)<s,f>[transform\_view](./transform-view.html)<s,f>::type

| A lazy Forward Sequence such that for each i in the range [begin<v>::type, end<v>::type) and each j in for in the range [begin<s>::type, end<s>::type) deref<i>::type is identical to apply< f, deref<j>::type >::type. | | size<v>::type | The size of v; size<v>::value == size<s>::value; linear complexity; see Forward Sequence. |

Example

Find the largest type in a sequence.

typedef[vector](./vector.html)<int,long,char,char[50],double> types;
typedef[max\_element](./max-element.html)<[transform\_view](./transform-view.html)< types, size_of<_> >
    >::type iter;[BOOST\_MPL\_ASSERT\_RELATION](./assert-relation.html)([deref](./deref.html)<iter>::type::value, ==, 50 );

See also

Sequences, Views, filter_view, joint_view, zip_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) |