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< title > Associative Sequence< / title >
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< div class = "section" >
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< div class = "titlepage" > < div > < div > < h4 class = "title" >
< a name = "fusion.sequence.concepts.associative_sequence" > < / a > < a class = "link" href = "associative_sequence.html" title = "Associative Sequence" > Associative
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Sequence< / a >
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< / h4 > < / div > < / div > < / div >
< a name = "fusion.sequence.concepts.associative_sequence.description" > < / a > < h6 >
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< a name = "id907525" > < / a >
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< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.description" > Description< / a >
< / h6 >
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< p >
An Associative Sequence allows efficient retrieval of elements based on
keys. Like associative sequences in < a href = "http://www.boost.org/libs/mpl/index.html" target = "_top" > MPL< / a > ,
and unlike associative containers in < a href = "http://en.wikipedia.org/wiki/Standard_Template_Library" target = "_top" > STL< / a > ,
Fusion associative sequences have no implied ordering relation. Instead,
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type identity is used to impose an equivalence relation on keys.
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< / p >
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< div class = "variablelist" >
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< p class = "title" > < b > Notation< / b > < / p >
< dl >
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< dt > < span class = "term" > < code class = "computeroutput" > < span class = "identifier" > s< / span > < / code > < / span > < / dt >
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< dd > < p >
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An Associative Sequence
< / p > < / dd >
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< dt > < span class = "term" > < code class = "computeroutput" > < span class = "identifier" > S< / span > < / code > < / span > < / dt >
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< dd > < p >
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An Associative Sequence type
< / p > < / dd >
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< dt > < span class = "term" > < code class = "computeroutput" > < span class = "identifier" > K< / span > < / code > < / span > < / dt >
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< dd > < p >
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An arbitrary < span class = "emphasis" > < em > key< / em > < / span > type
< / p > < / dd >
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< dt > < span class = "term" > < code class = "computeroutput" > < span class = "identifier" > o< / span > < / code > < / span > < / dt >
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< dd > < p >
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An arbitrary object
< / p > < / dd >
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< dt > < span class = "term" > < code class = "computeroutput" > < span class = "identifier" > e< / span > < / code > < / span > < / dt >
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< dd > < p >
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A Sequence element
< / p > < / dd >
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< / dl >
< / div >
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< a name = "fusion.sequence.concepts.associative_sequence.valid_expressions" > < / a > < h6 >
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< a name = "id907664" > < / a >
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< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.valid_expressions" > Valid
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Expressions< / a >
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< / h6 >
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< p >
For any Associative Sequence the following expressions must be valid:
< / p >
< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
< col >
< col >
< / colgroup >
< thead > < tr >
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< th >
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< p >
Expression
< / p >
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< / th >
< th >
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< p >
Return type
< / p >
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< / th >
< th >
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< p >
Type Requirements
< / p >
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< / th >
< th >
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< p >
Runtime Complexity
< / p >
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< / th >
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< / tr > < / thead >
< tbody >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/functions/has_key.html" title = "has_key" > < code class = "computeroutput" > < span class = "identifier" > has_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / code >
< / p >
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< / td >
< td >
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< p >
< a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
Boolean Constant< / a > . Convertible to bool.
< / p >
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< / td >
< td >
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< p >
< / p >
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< / td >
< td >
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< p >
Constant
< / p >
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< / td >
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< / tr >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/functions/at_key.html" title = "at_key" > < code class = "computeroutput" > < span class = "identifier" > at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / code >
< / p >
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< / td >
< td >
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< p >
Any type
< / p >
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< / td >
< td >
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< p >
< / p >
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< / td >
< td >
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< p >
Constant
< / p >
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< / td >
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< / tr >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/functions/at_key.html" title = "at_key" > < code class = "computeroutput" > < span class = "identifier" > at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span >
< span class = "special" > =< / span > < span class = "identifier" > o< / span > < / code >
< / p >
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< / td >
< td >
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< p >
Any type
< / p >
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< / td >
< td >
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< p >
< code class = "computeroutput" > < span class = "identifier" > s< / span > < / code > is mutable
and < code class = "computeroutput" > < span class = "identifier" > e< / span > < span class = "special" > =< / span >
< span class = "identifier" > o< / span > < / code > , where < code class = "computeroutput" > < span class = "identifier" > e< / span > < / code > is the first element in the
sequence, is a valid expression.
< / p >
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< / td >
< td >
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< p >
Constant
< / p >
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< / td >
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< / tr >
< / tbody >
< / table > < / div >
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< a name = "fusion.sequence.concepts.associative_sequence.result_type_expressions" > < / a > < h6 >
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< a name = "id907968" > < / a >
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< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.result_type_expressions" > Result
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Type Expressions< / a >
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< / h6 >
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< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
< / colgroup >
< thead > < tr >
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< th >
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< p >
Expression
< / p >
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< / th >
< th >
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< p >
Compile Time Complexity
< / p >
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< / th >
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< / tr > < / thead >
< tbody >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/metafunctions/has_key.html" title = "has_key" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > has_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span >
< span class = "identifier" > K< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / code >
< / p >
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< / td >
< td >
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< p >
Amortized constant time
< / p >
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< / td >
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< / tr >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/metafunctions/at_key.html" title = "at_key" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span >
< span class = "identifier" > K< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / code >
< / p >
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< / td >
< td >
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< p >
Amortized constant time
< / p >
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< / td >
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< / tr >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/metafunctions/value_at_key.html" title = "value_at_key" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > value_at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span > < span class = "identifier" > K< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / code >
< / p >
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< / td >
< td >
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< p >
Amortized constant time
< / p >
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< / td >
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< / tr >
< / tbody >
< / table > < / div >
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< div class = "sidebar" >
< p class = "title" > < b > < / b > < / p >
< p >
< span class = "inlinemediaobject" > < img src = "../../../images/note.png" alt = "note" > < / span > < code class = "computeroutput" > < a class = "link" href = "../intrinsic/metafunctions/at_key.html" title = "at_key" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span > < span class = "identifier" > K< / span > < span class = "special" > > < / span > < / code > returns the actual type returned by
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/functions/at_key.html" title = "at_key" > < code class = "computeroutput" > < span class = "identifier" > at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / code > . In
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most cases, this is a reference. Hence, there is no way to know the exact
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element type using < code class = "computeroutput" > < a class = "link" href = "../intrinsic/metafunctions/at_key.html" title = "at_key" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span > < span class = "identifier" > K< / span > < span class = "special" > > < / span > < / code > .The element at < code class = "computeroutput" > < span class = "identifier" > K< / span > < / code >
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may actually be a reference to begin with. For this purpose, you can use
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< code class = "computeroutput" > < a class = "link" href = "../intrinsic/metafunctions/value_at_key.html" title = "value_at_key" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > value_at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span > < span class = "identifier" > N< / span > < span class = "special" > > < / span > < / code > .
< / p >
< / div >
< a name = "fusion.sequence.concepts.associative_sequence.expression_semantics" > < / a > < h6 >
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< a name = "id908922" > < / a >
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< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.expression_semantics" > Expression
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Semantics< / a >
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< / h6 >
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< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
< / colgroup >
< thead > < tr >
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< th >
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< p >
Expression
< / p >
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< / th >
< th >
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< p >
Semantics
< / p >
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< / th >
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< / tr > < / thead >
< tbody >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/functions/has_key.html" title = "has_key" > < code class = "computeroutput" > < span class = "identifier" > has_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / code >
< / p >
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< / td >
< td >
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< p >
A boolean Integral Constant < code class = "computeroutput" > < span class = "identifier" > c< / span > < / code >
such that < code class = "computeroutput" > < span class = "identifier" > c< / span > < span class = "special" > ::< / span > < span class = "identifier" > value< / span > < span class = "special" > ==< / span >
< span class = "keyword" > true< / span > < / code > if and only if there
is one or more elements with the key < code class = "computeroutput" > < span class = "identifier" > k< / span > < / code >
in < code class = "computeroutput" > < span class = "identifier" > s< / span > < / code > ; see < a class = "link" href = "../intrinsic/functions/has_key.html" title = "has_key" > < code class = "computeroutput" > < span class = "identifier" > has_key< / span > < / code > < / a > .
< / p >
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< / td >
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< / tr >
< tr >
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< td >
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< p >
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/functions/at_key.html" title = "at_key" > < code class = "computeroutput" > < span class = "identifier" > at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / code >
< / p >
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< / td >
< td >
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< p >
The element associated with the key < code class = "computeroutput" > < span class = "identifier" > K< / span > < / code >
in the sequence < code class = "computeroutput" > < span class = "identifier" > s< / span > < / code > ;
see < a class = "link" href = "../intrinsic/functions/at.html" title = "at" > < code class = "computeroutput" > < span class = "identifier" > at< / span > < / code > < / a > .
< / p >
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< / td >
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< / tr >
< / tbody >
< / table > < / div >
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< a name = "fusion.sequence.concepts.associative_sequence.models" > < / a > < h6 >
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< a name = "id909147" > < / a >
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< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.models" > Models< / a >
< / h6 >
< div class = "itemizedlist" > < ul class = "itemizedlist" type = "disc" >
< li class = "listitem" > < a class = "link" href = "../../container/set.html" title = "set" > < code class = "computeroutput" > < span class = "identifier" > set< / span > < / code > < / a > < / li >
< li class = "listitem" > < a class = "link" href = "../../container/map.html" title = "map" > < code class = "computeroutput" > < span class = "identifier" > map< / span > < / code > < / a > < / li >
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< li class = "listitem" >
< a class = "link" href = "../../view/filter_view.html" title = "filter_view" > < code class = "computeroutput" > < span class = "identifier" > filter_view< / span > < / code > < / a >
(where adapted sequence is an < a class = "link" href = "associative_sequence.html" title = "Associative Sequence" > Associative
Sequence< / a > and a < a class = "link" href = "forward_sequence.html" title = "Forward Sequence" > Forward
Sequence< / a > )
< / li >
< li class = "listitem" >
< a class = "link" href = "../../view/iterator_range.html" title = "iterator_range" > < code class = "computeroutput" > < span class = "identifier" > iterator_range< / span > < / code > < / a >
(where adapted iterators are < a class = "link" href = "../../iterator/concepts/associative_iterator.html" title = "Associative Iterator" > Associative
Iterator< / a > s)
< / li >
< li class = "listitem" >
< a class = "link" href = "../../view/joint_view.html" title = "joint_view" > < code class = "computeroutput" > < span class = "identifier" > joint_view< / span > < / code > < / a >
(where adapted sequences are < a class = "link" href = "associative_sequence.html" title = "Associative Sequence" > Associative
Sequence< / a > s and < a class = "link" href = "forward_sequence.html" title = "Forward Sequence" > Forward
Sequence< / a > s)
< / li >
< li class = "listitem" >
< a class = "link" href = "../../view/reverse_view.html" title = "reverse_view" > < code class = "computeroutput" > < span class = "identifier" > reverse_view< / span > < / code > < / a >
(where adapted sequence is an < a class = "link" href = "associative_sequence.html" title = "Associative Sequence" > Associative
Sequence< / a > and a < a class = "link" href = "bidirectional_sequence.html" title = "Bidirectional Sequence" > Bidirectional
Sequence< / a > )
< / li >
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< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" > < tr >
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< td align = "right" > < div class = "copyright-footer" > Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger< p >
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt< / a > )
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