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< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" >
< title > pair</ title >
< link rel = "stylesheet" href = "../../../../../../doc/html/boostbook.css" type = "text/css" >
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<<<<<< < .working
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< meta name = "generator" content = "DocBook XSL Stylesheets V1.65.1" >
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=======
< meta name = "generator" content = "DocBook XSL Stylesheets V1.75.1" >
>>>>>>> .merge-right.r57125
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< link rel = "home" href = "../../index.html" title = "Chapter >
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< link rel = "up" href = "../support.html" title = "Support" >
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< link rel = "previous" href = "deduce_sequence.html" title = "deduce_sequence" >
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< link rel = "next" href = "../iterator.html" title = "Iterator" >
</ head >
< body bgcolor = "white" text = "black" link = "#0000FF" vlink = "#840084" alink = "#0000FF" >
< table cellpadding = "2" width = "100%" >< tr >
< td valign = "top" >< img alt = "Boost C++ Libraries" width = "277" height = "86" src = "../../../../../../boost.png" ></ td >
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< td align = "center" >< a href = "../../../../../../index.html" > Home</ a ></ td >
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< td align = "center" >< a href = "../../../../../libraries.htm" > Libraries</ a ></ td >
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< td align = "center" >< a href = "http://www.boost.org/users/people.html" > People</ a ></ td >
< td align = "center" >< a href = "http://www.boost.org/users/faq.html" > FAQ</ a ></ td >
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< td align = "center" >< a href = "../../../../../../more/index.htm" > More</ a ></ td >
</ tr ></ table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "deduce_sequence.html" >< img src = "../../../../../../doc/html/images/prev.png" alt = "Prev" ></ a >< a accesskey = "u" href = "../support.html" >< img src = "../../../../../../doc/html/images/up.png" alt = "Up" ></ a >< a accesskey = "h" href = "../../index.html" >< img src = "../../../../../../doc/html/images/home.png" alt = "Home" ></ a >< a accesskey = "n" href = "../iterator.html" >< img src = "../../../../../../doc/html/images/next.png" alt = "Next" ></ a >
</ div >
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<<<<<< < .working
2009-10-11 16:12:54 +00:00
< div class = "section" lang = "en" >
< div class = "titlepage" >
< div >< div >< h3 class = "title" >
< a name = "fusion.support.pair" ></ a >< a href = "pair.html" title = "pair" > pair</ a >
</ h3 ></ div ></ div >
< div ></ div >
</ div >
< a name = "fusion.support.pair.description" ></ a >< h4 >
< a name = "id418183" ></ a >
< a href = "pair.html#fusion.support.pair.description" > Description</ a >
</ h4 >
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=======
< div class = "section" title = "pair" >
< div class = "titlepage" >< div >< div >< h3 class = "title" >
< a name = "fusion.support.pair" ></ a >< a class = "link" href = "pair.html" title = "pair" > pair</ a >
</ h3 ></ div ></ div ></ div >
< a name = "fusion.support.pair.description" ></ a >< h5 >
< a name = "id617959" ></ a >
< a class = "link" href = "pair.html#fusion.support.pair.description" > Description</ a >
</ h5 >
>>>>>>> .merge-right.r57125
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< p >
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Fusion < tt class = "computeroutput" >< span class = "identifier" > pair</ span ></ tt > type is a half
runtime pair. A half runtime pair is similar to a < a href = "../adapted/std__pair.html" title = "std::pair" >< tt class = "computeroutput" >< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > pair</ span ></ tt ></ a > ,
but, unlike < a href = "../adapted/std__pair.html" title = "std::pair" >< tt class = "computeroutput" >< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > pair</ span ></ tt ></ a > ,
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the first type does not have data. It is used as elements in < a class = "link" href = "../container/map.html" title = "map" >< code class = "computeroutput" >< span class = "identifier" > map</ span ></ code ></ a > s, for example.
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</ p >
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<<<<<< < .working
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< a name = "fusion.support.pair.synopsis" ></ a >< h4 >
< a name = "id418285" ></ a >
< a href = "pair.html#fusion.support.pair.synopsis" > Synopsis</ a >
</ h4 >
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=======
< a name = "fusion.support.pair.synopsis" ></ a >< h5 >
< a name = "id618026" ></ a >
< a class = "link" href = "pair.html#fusion.support.pair.synopsis" > Synopsis</ a >
</ h5 >
>>>>>>> .merge-right.r57125
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< pre class = "programlisting" >< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > First</ span >< span class = "special" > ,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > Second</ span >< span class = "special" > > </ span >
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< span class = "keyword" > struct</ span > < span class = "identifier" > pair</ span >< span class = "special" > ;</ span >
< span class = "keyword" > namespace</ span > < span class = "identifier" > result_of</ span >
< span class = "special" > {</ span >
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< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > Pair</ span >< span class = "special" > > </ span >
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< span class = "keyword" > struct</ span > < span class = "identifier" > first</ span >< span class = "special" > ;</ span >
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< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > Pair</ span >< span class = "special" > > </ span >
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< span class = "keyword" > struct</ span > < span class = "identifier" > second</ span >< span class = "special" > ;</ span >
< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > First</ span >< span class = "special" > ,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > Second</ span >< span class = "special" > > </ span >
< span class = "keyword" > struct</ span > < span class = "identifier" > make_pair</ span >< span class = "special" > ;</ span >
< span class = "special" > }</ span >
< span class = "keyword" > template</ span > < span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > First</ span >< span class = "special" > ,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > Second</ span >< span class = "special" > > </ span >
< span class = "keyword" > typename</ span > < span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > make_pair</ span >< span class = "special" > < </ span >< span class = "identifier" > First</ span >< span class = "special" > ,</ span >< span class = "identifier" > Second</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span >
< span class = "identifier" > make_pair</ span >< span class = "special" > (</ span >< span class = "identifier" > Second</ span > < span class = "keyword" > const</ span > < span class = "special" > & );</ span >
</ pre >
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<<<<<< < .working
2009-10-11 16:12:54 +00:00
< a name = "fusion.support.pair.template_parameters" ></ a >< h4 >
< a name = "id418690" ></ a >
< a href = "pair.html#fusion.support.pair.template_parameters" > Template parameters</ a >
</ h4 >
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=======
< a name = "fusion.support.pair.template_parameters" ></ a >< h5 >
< a name = "id618322" ></ a >
< a class = "link" href = "pair.html#fusion.support.pair.template_parameters" > Template parameters</ a >
</ h5 >
>>>>>>> .merge-right.r57125
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< div class = "informaltable" >< table class = "table" >
< colgroup >
< col >
< col >
</ colgroup >
< thead >< tr >
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< th >< p >
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Parameter
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</ p ></ th >
< th >< p >
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Description
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</ p ></ th >
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</ tr ></ thead >
< tbody >
< tr >
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< td >< p >
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First
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</ p ></ td >
< td >< p >
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The first type. This is purely a type. No data is held.
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</ p ></ td >
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</ tr >
< tr >
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< td >< p >
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Second
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</ p ></ td >
< td >< p >
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The second type. This contains data.
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</ p ></ td >
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</ tr >
</ tbody >
</ table ></ div >
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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" >< tt class = "computeroutput" >< span class = "identifier" > P</ span ></ tt ></ span ></ dt >
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< dd >< p >
Fusion pair type
</ p ></ dd >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > p</ span ></ tt > ,
< tt class = "computeroutput" >< span class = "identifier" > p2</ span ></ tt ></ span ></ dt >
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< dd >< p >
Fusion pairs
</ p ></ dd >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > F</ span ></ tt > ,
< tt class = "computeroutput" >< span class = "identifier" > S</ span ></ tt ></ span ></ dt >
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< dd >< p >
Arbitrary types
</ p ></ dd >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt ></ span ></ dt >
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< dd >< p >
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Value of type < tt class = "computeroutput" >< span class = "identifier" > S</ span ></ tt >
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</ p ></ dd >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > o</ span ></ tt ></ span ></ dt >
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< dd >< p >
Output stream
</ p ></ dd >
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< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > i</ span ></ tt ></ span ></ dt >
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< dd >< p >
Input stream
</ p ></ dd >
</ dl >
</ div >
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<<<<<< < .working
2009-10-11 16:12:54 +00:00
< a name = "fusion.support.pair.expression_semantics" ></ a >< h4 >
< a name = "id418971" ></ a >
< a href = "pair.html#fusion.support.pair.expression_semantics" > Expression Semantics</ a >
</ h4 >
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=======
< a name = "fusion.support.pair.expression_semantics" ></ a >< h5 >
< a name = "id618540" ></ a >
< a class = "link" href = "pair.html#fusion.support.pair.expression_semantics" > Expression Semantics</ a >
</ h5 >
>>>>>>> .merge-right.r57125
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< div class = "informaltable" >< table class = "table" >
< colgroup >
< col >
< col >
</ colgroup >
< thead >< tr >
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< th >< p >
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Expression
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</ p ></ th >
< th >< p >
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Semantics
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</ p ></ th >
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</ tr ></ thead >
< tbody >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > P</ span >< span class = "special" > ::</ span >< span class = "identifier" > first_type</ span ></ tt >
</ p ></ td >
< td >< p >
The type of the first template parameter, < tt class = "computeroutput" >< span class = "identifier" > F</ span ></ tt > ,
equivalent to < tt class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > first</ span >< span class = "special" > < </ span >< span class = "identifier" > P</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ tt > .
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > P</ span >< span class = "special" > ::</ span >< span class = "identifier" > second_type</ span ></ tt >
</ p ></ td >
< td >< p >
The type of the second template parameter, < tt class = "computeroutput" >< span class = "identifier" > S</ span ></ tt > ,
equivalent to < tt class = "computeroutput" >< span class = "identifier" > result_of</ span >< span class = "special" > ::</ span >< span class = "identifier" > second</ span >< span class = "special" > < </ span >< span class = "identifier" > P</ span >< span class = "special" > > ::</ span >< span class = "identifier" > type</ span ></ tt > .
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > P</ span >< span class = "special" > ()</ span ></ tt >
</ p ></ td >
< td >< p >
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Default construction.
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</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > P</ span >< span class = "special" > (</ span >< span class = "identifier" > s</ span >< span class = "special" > )</ span ></ tt >
</ p ></ td >
< td >< p >
Construct a pair given value for the second type, < tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt > .
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > P</ span >< span class = "special" > (</ span >< span class = "identifier" > p2</ span >< span class = "special" > )</ span ></ tt >
</ p ></ td >
< td >< p >
Copy constructs a pair from another pair, < tt class = "computeroutput" >< span class = "identifier" > p2</ span ></ tt > .
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > p</ span >< span class = "special" > .</ span >< span class = "identifier" > second</ span ></ tt >
</ p ></ td >
< td >< p >
Get the data from < tt class = "computeroutput" >< span class = "identifier" > p1</ span ></ tt > .
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > p</ span > < span class = "special" > =</ span >
< span class = "identifier" > p2</ span ></ tt >
</ p ></ td >
< td >< p >
Assigns a pair, < tt class = "computeroutput" >< span class = "identifier" > p1</ span ></ tt > ,
from another pair, < tt class = "computeroutput" >< span class = "identifier" > p2</ span ></ tt > .
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
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make_pair< F> (s)
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</ p ></ td >
< td >< p >
Make a pair given the first type, < tt class = "computeroutput" >< span class = "identifier" > F</ span ></ tt > ,
and a value for the second type, < tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt > .
The second type assumes the type of < tt class = "computeroutput" >< span class = "identifier" > s</ span ></ tt >
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > o</ span > < span class = "special" > << </ span >
< span class = "identifier" > p</ span ></ tt >
</ p ></ td >
< td >< p >
Output < tt class = "computeroutput" >< span class = "identifier" > p</ span ></ tt > to output
stream, < tt class = "computeroutput" >< span class = "identifier" > o</ span ></ tt > .
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > i</ span > < span class = "special" > >> </ span >
< span class = "identifier" > p</ span ></ tt >
</ p ></ td >
< td >< p >
Input < tt class = "computeroutput" >< span class = "identifier" > p</ span ></ tt > from input
stream, < tt class = "computeroutput" >< span class = "identifier" > i</ span ></ tt > .
</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > p</ span > < span class = "special" > ==</ span >
< span class = "identifier" > p2</ span ></ tt >
</ p ></ td >
< td >< p >
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Tests two pairs for equality.
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</ p ></ td >
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</ tr >
< tr >
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< td >< p >
< tt class = "computeroutput" >< span class = "identifier" > p</ span > < span class = "special" > !=</ span >
< span class = "identifier" > p2</ span ></ tt >
</ p ></ td >
< td >< p >
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Tests two pairs for inequality.
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</ p ></ td >
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</ tr >
</ tbody >
</ table ></ div >
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<<<<<< < .working
2009-10-11 16:12:54 +00:00
< a name = "fusion.support.pair.header" ></ a >< h4 >
< a name = "id419746" ></ a >
< a href = "pair.html#fusion.support.pair.header" > Header</ a >
</ h4 >
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=======
< a name = "fusion.support.pair.header" ></ a >< h5 >
< a name = "id619127" ></ a >
< a class = "link" href = "pair.html#fusion.support.pair.header" > Header</ a >
</ h5 >
>>>>>>> .merge-right.r57125
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< pre class = "programlisting" >< span class = "preprocessor" > #include</ span > < span class = "special" > < </ span >< span class = "identifier" > boost</ span >< span class = "special" > /</ span >< span class = "identifier" > fusion</ span >< span class = "special" > /</ span >< span class = "identifier" > support</ span >< span class = "special" > /</ span >< span class = "identifier" > pair</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
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< span class = "preprocessor" > #include</ span > < span class = "special" > < </ span >< span class = "identifier" > boost</ span >< span class = "special" > /</ span >< span class = "identifier" > fusion</ span >< span class = "special" > /</ span >< span class = "identifier" > include</ span >< span class = "special" > /</ span >< span class = "identifier" > pair</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
</ pre >
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<<<<<< < .working
2009-10-11 16:12:54 +00:00
< a name = "fusion.support.pair.example" ></ a >< h4 >
< a name = "id419900" ></ a >
< a href = "pair.html#fusion.support.pair.example" > Example</ a >
</ h4 >
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=======
< a name = "fusion.support.pair.example" ></ a >< h5 >
< a name = "id619235" ></ a >
< a class = "link" href = "pair.html#fusion.support.pair.example" > Example</ a >
</ h5 >
>>>>>>> .merge-right.r57125
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< pre class = "programlisting" >< span class = "identifier" > pair</ span >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > ,</ span > < span class = "keyword" > char</ span >< span class = "special" > > </ span > < span class = "identifier" > p</ span >< span class = "special" > (</ span >< span class = "char" > 'X'</ span >< span class = "special" > );</ span >
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< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > cout</ span > < span class = "special" > << </ span > < span class = "identifier" > p</ span > < span class = "special" > << </ span > < span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > endl</ span >< span class = "special" > ;</ span >
< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > cout</ span > < span class = "special" > << </ span > < span class = "identifier" > make_pair</ span >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > > (</ span >< span class = "char" > 'X'</ span >< span class = "special" > )</ span > < span class = "special" > << </ span > < span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > endl</ span >< span class = "special" > ;</ span >
< span class = "identifier" > assert</ span >< span class = "special" > ((</ span >< span class = "identifier" > p</ span > < span class = "special" > ==</ span > < span class = "identifier" > make_pair</ span >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > > (</ span >< span class = "char" > 'X'</ span >< span class = "special" > )));</ span >
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