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< title > The MPL Reference Manual: back</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./at-c.html" class = "navigation-link" > Prev</ a > < a href = "./begin.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./at-c.html" class = "navigation-link" > Back</ a > < a href = "./begin.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./intrinsic-metafunctions.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 = "./intrinsic-metafunctions.html" class = "navigation-link" > Intrinsic Metafunctions</ a > / < a href = "./back.html" class = "navigation-link" > back</ a ></ td >
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< div class = "section" id = "back" >
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< h1 >< a class = "toc-backref" href = "./intrinsic-metafunctions.html#id1427" > back</ a ></ h1 >
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< div class = "section" id = "id193" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
template<
typename Sequence
>
struct < a href = "./back.html" class = "identifier" > back</ a >
{
typedef < em > unspecified</ em > type;
};
</ pre >
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< div class = "section" id = "id194" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
< p > Returns the last element in the sequence.</ p >
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< div class = "section" id = "id195" >
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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/back.hpp" class = "header" > boost/mpl/back.hpp</ a > >
</ pre >
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< div class = "section" id = "id196" >
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< h3 >< a class = "subsection-title" href = "#model-of" name = "model-of" > Model of</ a ></ h3 >
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< p >< a class = "reference internal" href = "./tag-dispatched-metafunction.html" > Tag Dispatched Metafunction</ a ></ p >
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< div class = "section" id = "id197" >
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< h3 >< a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters</ a ></ h3 >
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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" > Sequence</ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./bidirectional-sequence.html" > Bidirectional Sequence</ a ></ td >
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< td > A sequence to be examined.</ td >
</ tr >
</ tbody >
</ table >
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< div class = "section" id = "id198" >
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< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
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< p > For any < a class = "reference internal" href = "./bidirectional-sequence.html" > Bidirectional Sequence</ a > < tt class = "literal" >< span class = "pre" > s</ span ></ tt > :</ p >
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< pre class = "literal-block" >
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typedef < a href = "./back.html" class = "identifier" > back</ a > < s> ::type t;
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</ pre >
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< col class = "field-name" />
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< tr class = "field" >< th class = "field-name" > Return type:</ th >< td class = "field-body" >< p class = "first" > A type.</ p >
</ td >
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</ tr >
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< tr class = "field" >< th class = "field-name" > Precondition:</ th >< td class = "field-body" >< p class = "first" >< tt class = "literal" >< span class = "pre" >< a href = "./empty.html" class = "identifier" > empty</ a > < s> ::value</ span > < span class = "pre" > ==</ span > < span class = "pre" > false</ span ></ tt > .</ p >
</ td >
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</ tr >
< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" >< p class = "first" > Equivalent to</ p >
< pre class = "last literal-block" >
typedef < a href = "./deref.html" class = "identifier" > deref</ a > < < a href = "./prior.html" class = "identifier" > prior</ a > < < a href = "./end.html" class = "identifier" > end</ a > < s> ::type > ::type > ::type t;
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< div class = "section" id = "id199" >
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< h3 >< a class = "subsection-title" href = "#complexity" name = "complexity" > Complexity</ a ></ h3 >
< p > Amortized constant time.</ p >
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< div class = "section" id = "id200" >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
typedef < a href = "./range-c.html" class = "identifier" > range_c</ a > < int,0,1> range1;
typedef < a href = "./range-c.html" class = "identifier" > range_c</ a > < int,0,10> range2;
typedef < a href = "./range-c.html" class = "identifier" > range_c</ a > < int,-10,0> range3;
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< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./back.html" class = "identifier" > back</ a > < range1> ::value, ==, 0 );
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./back.html" class = "identifier" > back</ a > < range2> ::value, ==, 9 );
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./back.html" class = "identifier" > back</ a > < range3> ::value, ==, -1 );
</ pre >
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< div class = "section" id = "id201" >
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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 = "./bidirectional-sequence.html" > Bidirectional Sequence</ a > , < a class = "reference internal" href = "./front.html" > front</ a > , < a class = "reference internal" href = "./push-back.html" > push_back</ a > , < a class = "reference internal" href = "./end.html" > end</ a > , < a class = "reference internal" href = "./deref.html" > deref</ a > , < a class = "reference internal" href = "./at.html" > at</ a ></ p >
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<!-- Sequences/Intrinsic Metafunctions//begin -->
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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
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