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< title > The MPL Reference Manual: single_view</ title >
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< body class = "docframe refmanual" >
< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./joint-view.html" class = "navigation-link" > Prev</ a > < a href = "./transform-view.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./joint-view.html" class = "navigation-link" > Back</ a > < a href = "./transform-view.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./views.html" class = "navigation-link" > Up</ a > < a href = "../refmanual.html" class = "navigation-link" > Home</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./refmanual_toc.html" class = "navigation-link" > Full TOC</ a ></ span ></ td >
< td class = "header-group page-location" >< a href = "../refmanual.html" class = "navigation-link" > Front Page</ a > / < a href = "./sequences.html" class = "navigation-link" > Sequences</ a > / < a href = "./views.html" class = "navigation-link" > Views</ a > / < a href = "./single-view.html" class = "navigation-link" > single_view</ a ></ td >
</ tr ></ table >< div class = "header-separator" ></ div >
< div class = "section" id = "single-view" >
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< h1 >< a class = "toc-backref" href = "./views.html#id1421" > single_view</ a ></ h1 >
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< div class = "section" id = "id151" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
template<
typename T
>
struct < a href = "./single-view.html" class = "identifier" > single_view</ a >
{
// < em > unspecified</ em >
// < em > ...</ em >
};
</ pre >
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< div class = "section" id = "id152" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
< p > A view onto an arbitrary type < tt class = "literal" >< span class = "pre" > T</ span ></ tt > as on a single-element sequence.</ p >
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< div class = "section" id = "id153" >
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< h3 >< a class = "subsection-title" href = "#header" name = "header" > Header</ a ></ h3 >
< pre class = "literal-block" >
#include < < a href = "../../../../boost/mpl/single_view.hpp" class = "header" > boost/mpl/single_view.hpp</ a > >
</ pre >
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< div class = "section" id = "id154" >
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< h3 >< a class = "subsection-title" href = "#model-of" name = "model-of" > Model of</ a ></ h3 >
< ul class = "simple" >
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< li >< a class = "reference internal" href = "./random-access-sequence.html" > Random Access Sequence</ a ></ li >
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</ ul >
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< div class = "section" id = "id155" >
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< h3 >< a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters</ a ></ h3 >
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< table border = "1" class = "docutils table" >
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< colgroup >
< col width = "19%" />
< col width = "23%" />
< col width = "58%" />
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< thead valign = "bottom" >
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< tr >< th class = "head" > Parameter</ th >
< th class = "head" > Requirement</ th >
< th class = "head" > Description</ th >
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</ tr >
</ thead >
< tbody valign = "top" >
< tr >< td >< tt class = "literal" >< span class = "pre" > T</ span ></ tt ></ td >
< td > Any type</ td >
< td > The type to be wrapped in a sequence.</ td >
</ tr >
</ tbody >
</ table >
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< div class = "section" id = "id156" >
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< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
< p > The semantics of an expression are defined only
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where they differ from, or are not defined in < a class = "reference internal" href = "./random-access-sequence.html" > Random Access Sequence</ a > .</ p >
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< p > In the following table, < tt class = "literal" >< span class = "pre" > v</ span ></ tt > is an instance of < tt class = "literal" >< span class = "pre" >< a href = "./single-view.html" class = "identifier" > single_view</ a ></ span ></ tt > , < tt class = "literal" >< span class = "pre" > x</ span ></ tt > is an arbitrary type.</ p >
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< table border = "1" class = "docutils table" >
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< colgroup >
< col width = "34%" />
< col width = "66%" />
</ colgroup >
< thead valign = "bottom" >
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< tr >< th class = "head" > Expression</ th >
< th class = "head" > Semantics</ th >
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</ tr >
</ thead >
< tbody valign = "top" >
< tr >< td >< pre class = "first last literal-block" >
< a href = "./single-view.html" class = "identifier" > single_view</ a > < x>
< a href = "./single-view.html" class = "identifier" > single_view</ a > < x> ::type
</ pre >
</ td >
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< td > A single-element < a class = "reference internal" href = "./random-access-sequence.html" > Random Access Sequence</ a > < tt class = "literal" >< span class = "pre" > v</ span ></ tt > such that
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< tt class = "literal" >< span class = "pre" >< a href = "./front.html" class = "identifier" > front</ a > < v> ::type</ span ></ tt > is identical to < tt class = "literal" >< span class = "pre" > x</ span ></ tt > .</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < v> ::type</ span ></ tt ></ td >
< td > The size of < tt class = "literal" >< span class = "pre" > v</ span ></ tt > ; < tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < v> ::value</ span > < span class = "pre" > ==</ span > < span class = "pre" > 1</ span ></ tt > ;
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see < a class = "reference internal" href = "./random-access-sequence.html" > Random Access Sequence</ a > .</ td >
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</ tr >
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</ table >
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< div class = "section" id = "id157" >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
typedef < a href = "./single-view.html" class = "identifier" > single_view</ a > < int> view;
typedef < a href = "./begin.html" class = "identifier" > begin</ a > < view> ::type first;
typedef < a href = "./end.html" class = "identifier" > end</ a > < view> ::type last;
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( is_same< < a href = "./deref.html" class = "identifier" > deref</ a > < first> ::type,int > ));
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( is_same< < a href = "./next.html" class = "identifier" > next</ a > < first> ::type,last > ));
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( is_same< < a href = "./prior.html" class = "identifier" > prior</ a > < last> ::type,first > ));
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./size.html" class = "identifier" > size</ a > < view> ::value, ==, 1 );
</ pre >
</ div >
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< div class = "section" id = "id158" >
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< h3 >< a class = "subsection-title" href = "#see-also" name = "see-also" > See also</ a ></ h3 >
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< p >< a class = "reference internal" href = "./sequences.html" > Sequences</ a > , < a class = "reference internal" href = "./views.html" > Views</ a > , < a class = "reference internal" href = "./iterator-range.html" > iterator_range</ a > , < a class = "reference internal" href = "./filter-view.html" > filter_view</ a > , < a class = "reference internal" href = "./transform-view.html" > transform_view</ a > , < a class = "reference internal" href = "./joint-view.html" > joint_view</ a > , < a class = "reference internal" href = "./zip-view.html" > zip_view</ a ></ p >
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<!-- Sequences/Views//transform_view -->
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< table class = "footer" >< tr class = "footer" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./joint-view.html" class = "navigation-link" > Prev</ a > < a href = "./transform-view.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./joint-view.html" class = "navigation-link" > Back</ a > < a href = "./transform-view.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./views.html" class = "navigation-link" > Up</ a > < a href = "../refmanual.html" class = "navigation-link" > Home</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./refmanual_toc.html" class = "navigation-link" > Full TOC</ a ></ span ></ td >
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< td >< div class = "copyright-footer" >< div class = "copyright" > Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</ div >
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a class = "reference external" href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt</ a > )</ div ></ td ></ tr ></ table ></ body >
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