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< title > The MPL Reference Manual: order< / title >
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< table class = "header" > < tr class = "header" > < td class = "header-group navigation-bar" > < span class = "navigation-group" > < a href = "./key-type.html" class = "navigation-link" > Prev< / a > < a href = "./pop-back.html" class = "navigation-link" > Next< / a > < / span > < span class = "navigation-group-separator" > | < / span > < span class = "navigation-group" > < a href = "./key-type.html" class = "navigation-link" > Back< / a > < a href = "./pop-back.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 = "./order.html" class = "navigation-link" > order< / a > < / td >
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< div class = "section" id = "order" >
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< h1 > < a class = "toc-backref" href = "./intrinsic-metafunctions.html#id1440" > order< / a > < / h1 >
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< div class = "section" id = "id309" >
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< h3 > < a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis< / a > < / h3 >
< pre class = "literal-block" >
template<
typename Sequence
, typename Key
>
struct < a href = "./order.html" class = "identifier" > order< / a >
{
typedef < em > unspecified< / em > type;
};
< / pre >
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< h3 > < a class = "subsection-title" href = "#description" name = "description" > Description< / a > < / h3 >
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< p > Returns a unique unsigned < a class = "reference internal" href = "./integral-constant.html" > Integral Constant< / a > associated with the key < tt class = "literal" > < span class = "pre" > Key< / span > < / tt > in
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< tt class = "literal" > < span class = "pre" > Sequence< / span > < / tt > .< / p >
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< div class = "section" id = "id311" >
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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/order.hpp" class = "header" > boost/mpl/order.hpp< / a > >
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< div class = "section" id = "id312" >
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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 = "id313" >
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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 >
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< tr > < td > < tt class = "literal" > < span class = "pre" > Sequence< / span > < / tt > < / td >
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< td > < a class = "reference internal" href = "./associative-sequence.html" > Associative Sequence< / a > < / td >
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< td > A sequence to query.< / td >
< / tr >
< tr > < td > < tt class = "literal" > < span class = "pre" > Key< / span > < / tt > < / td >
< td > Any type< / td >
< td > The queried key.< / td >
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< div class = "section" id = "id314" >
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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 = "./associative-sequence.html" > Associative Sequence< / a > < tt class = "literal" > < span class = "pre" > s< / span > < / tt > , and arbitrary type < tt class = "literal" > < span class = "pre" > key< / span > < / tt > :< / p >
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< pre class = "literal-block" >
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typedef < a href = "./order.html" class = "identifier" > order< / a > < s,key> ::type n;
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< / 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" > Return type:< / th > < td class = "field-body" > Unsigned < a class = "reference internal" href = "./integral-constant.html" > Integral Constant< / a > .< / td >
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< / tr >
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< tr class = "field" > < th class = "field-name" > Semantics:< / th > < td class = "field-body" > If < tt class = "literal" > < span class = "pre" > < a href = "./has-key.html" class = "identifier" > has_key< / a > < s,key> ::value< / span > < span class = "pre" > ==< / span > < span class = "pre" > true< / span > < / tt > , < tt class = "literal" > < span class = "pre" > n< / span > < / tt > is a unique unsigned
< a class = "reference internal" href = "./integral-constant.html" > Integral Constant< / a > associated with < tt class = "literal" > < span class = "pre" > key< / span > < / tt > in < tt class = "literal" > < span class = "pre" > s< / span > < / tt > ; otherwise,
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< tt class = "literal" > < span class = "pre" > n< / span > < / tt > is identical to < tt class = "literal" > < span class = "pre" > < a href = "./void.html" class = "identifier" > void_< / a > < / span > < / tt > .< / td >
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< div class = "section" id = "id315" >
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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 = "id316" >
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< h3 > < a class = "subsection-title" href = "#example" name = "example" > Example< / a > < / h3 >
< pre class = "literal-block" >
typedef < a href = "./map.html" class = "identifier" > map< / a > < < a href = "./pair.html" class = "identifier" > pair< / a > < int,unsigned> , < a href = "./pair.html" class = "identifier" > pair< / a > < char,long> > m;
< a href = "./assert-not.html" class = "identifier" > BOOST_MPL_ASSERT_NOT< / a > (( is_same< < a href = "./order.html" class = "identifier" > order< / a > < m,int> ::type, < a href = "./void.html" class = "identifier" > void_< / a > > ));
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT< / a > (( is_same< < a href = "./order.html" class = "identifier" > order< / a > < m,long> ::type,< a href = "./void.html" class = "identifier" > void_< / a > > ));
< / pre >
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< div class = "section" id = "id317" >
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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 = "./associative-sequence.html" > Associative Sequence< / a > , < a class = "reference internal" href = "./has-key.html" > has_key< / a > , < a class = "reference internal" href = "./count.html" > count< / a > , < a class = "reference internal" href = "./map.html" > map< / a > < / p >
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