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< title > The MPL Reference Manual: Variadic Sequence</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./integral-sequence-wrapper.html" class = "navigation-link" > Prev</ a > < a href = "./classes.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./integral-sequence-wrapper.html" class = "navigation-link" > Back</ a > Along</ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./concepts.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 = "./concepts.html" class = "navigation-link" > Concepts</ a > / < a href = "./variadic-sequence.html" class = "navigation-link" > Variadic Sequence</ a ></ td >
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< div class = "section" id = "variadic-sequence" >
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< h1 >< a class = "toc-backref" href = "./concepts.html#id1404" > Variadic Sequence</ a ></ h1 >
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< div class = "section" id = "id45" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
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< p > A < a class = "reference internal" href = "./variadic-sequence.html" > Variadic Sequence</ a > is a member of a family of sequence classes with both
< em > variadic</ em > and < em > numbered</ em > forms. If < tt class = "literal" >< span class = "pre" > seq</ span ></ tt > is a generic name for some
< a class = "reference internal" href = "./variadic-sequence.html" > Variadic Sequence</ a > , its < em > variadic form</ em > allows us to specify a sequence of
< em > n</ em > elements < em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub > , for any < em > n</ em > from 0 up to a
< a class = "reference internal" href = "./configuration.html" > preprocessor-configurable limit</ a > < tt class = "literal" >< span class = "pre" > BOOST_MPL_LIMIT_</ span ></ tt >< em > seq</ em >< tt class = "literal" >< span class = "pre" > _SIZE</ span ></ tt > ,
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using the following notation:</ p >
< blockquote >
< div class = "line-block" >
< div class = "line" >< tt class = "literal" >< span class = "pre" > seq< </ span ></ tt >< em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub >< tt class = "literal" >< span class = "pre" > > </ span ></ tt ></ div >
</ div >
</ blockquote >
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< p > By contrast, each < em > numbered</ em > sequence form accepts the exact number of elements
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that is encoded in the name of the corresponding class template:</ p >
< blockquote >
< div class = "line-block" >
< div class = "line" >< tt class = "literal" >< span class = "pre" > seq</ span ></ tt >< em > n</ em >< tt class = "literal" >< span class = "pre" > < </ span ></ tt >< em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub >< tt class = "literal" >< span class = "pre" > > </ span ></ tt ></ div >
</ div >
</ blockquote >
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< p > For numbered forms, there is no predefined top limit for < em > n</ em > , aside from compiler
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limitations on the number of template parameters.</ p >
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<!-- The variadic form of sequence ``seq`` is defined in
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``<boost/mpl/``\ *seq*\ ``.hpp>`` header.
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The numbered forms are defined in batches of 10. -->
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</ div >
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< div class = "section" id = "id47" >
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< h3 >< a class = "subsection-title" href = "#expression-requirements" name = "expression-requirements" > Expression requirements</ a ></ h3 >
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< p > In the following table and subsequent specifications, < tt class = "literal" >< span class = "pre" > seq</ span ></ tt > is a placeholder token for the actual
< a class = "reference internal" href = "./variadic-sequence.html" > Variadic Sequence</ a > name.</ p >
< table border = "1" class = "docutils table" >
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< thead valign = "bottom" >
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< tr >< th class = "head" > Expression</ th >
< th class = "head" > Type</ th >
< th class = "head" > Complexity</ th >
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</ tr >
</ thead >
< tbody valign = "top" >
< tr >< td >< tt class = "literal" >< span class = "pre" > seq< </ span ></ tt >< em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub >< tt class = "literal" >< span class = "pre" > > </ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a ></ td >
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< td > Amortized constant time</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > seq< </ span ></ tt >< em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub >< tt class = "literal" >< span class = "pre" > > ::type</ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a ></ td >
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< td > Amortized constant time</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > seq</ span ></ tt >< em > n</ em >< tt class = "literal" >< span class = "pre" > < </ span ></ tt >< em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub >< tt class = "literal" >< span class = "pre" > > </ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a ></ td >
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< td > Amortized constant time</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" > seq</ span ></ tt >< em > n</ em >< tt class = "literal" >< span class = "pre" > < </ span ></ tt >< em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub >< tt class = "literal" >< span class = "pre" > > ::type</ span ></ tt ></ td >
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< td >< a class = "reference internal" href = "./forward-sequence.html" > Forward Sequence</ a ></ td >
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< td > Amortized constant time</ td >
</ tr >
</ tbody >
</ table >
</ div >
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< div class = "section" id = "id48" >
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< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
< pre class = "literal-block" >
typedef seq< < em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub > > s;
typedef seq< em > n</ em > < < em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub > > s;
</ pre >
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< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" > s</ span ></ tt > is a sequence of elements < em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub > .</ td >
</ tr >
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< tr class = "field" >< th class = "field-name" > Postcondition:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s> ::value</ span > < span class = "pre" > ==</ span > < span class = "pre" > n</ span ></ tt > .<!-- FIXME .. parsed-literal::
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BOOST_MPL_ASSERT((|is_same|\< at_c<v,0>::type,\ |t1| >));
BOOST_MPL_ASSERT((|is_same|\< at_c<v,1>::type,\ |t2| >));
...
BOOST_MPL_ASSERT((|is_same|\< at_c<v,\ *n*>::type,\ |tn| >)); -->
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</ tbody >
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<!-- .......................................................................... -->
< pre class = "literal-block" >
typedef seq< < em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub > > ::type s;
typedef seq< em > n</ em > < < em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub > > ::type s;
</ pre >
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" />
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< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" > s</ span ></ tt > is identical to < tt class = "literal" >< span class = "pre" > seq</ span ></ tt >< em > n</ em >< tt class = "literal" >< span class = "pre" > < </ span ></ tt >< em > t</ em >< sub > 1</ sub > ,< em > t</ em >< sub > 2</ sub > ,... < em > t</ em >< sub > n</ sub > < tt class = "literal" >< span class = "pre" > > </ span ></ tt > .</ td >
</ tr >
< tr class = "field" >< th class = "field-name" > Postcondition:</ th >< td class = "field-body" >< tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s> ::value</ span > < span class = "pre" > ==</ span > < span class = "pre" > n</ span ></ tt > .</ td >
</ tr >
</ tbody >
</ table >
</ div >
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< div class = "section" id = "id49" >
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< h3 >< a class = "subsection-title" href = "#models" name = "models" > Models</ a ></ h3 >
< ul class = "simple" >
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< li >< a class = "reference internal" href = "./vector.html" > vector</ a ></ li >
< li >< a class = "reference internal" href = "./list.html" > list</ a ></ li >
< li >< a class = "reference internal" href = "./map.html" > map</ a ></ li >
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</ ul >
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< div class = "section" id = "id50" >
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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 = "./configuration.html" > Configuration</ a > , < a class = "reference internal" href = "./integral-sequence-wrapper.html" > Integral Sequence Wrapper</ a ></ p >
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< table class = "footer" >< tr class = "footer" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./integral-sequence-wrapper.html" class = "navigation-link" > Prev</ a > < a href = "./classes.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./integral-sequence-wrapper.html" class = "navigation-link" > Back</ a > Along</ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./concepts.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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