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< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" >
< title > pair< / title >
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< link rel = "stylesheet" href = "../../../../../../doc/html/boostbook.css" type = "text/css" >
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< meta name = "generator" content = "DocBook XSL Stylesheets V1.66.1" >
< link rel = "start" href = "../../index.html" title = "Chapter<65> 1.<2E> Fusion 2.0" >
< link rel = "up" href = "../support.html" title = "Support" >
< link rel = "prev" href = "deduce_sequence.html" title = "deduce_sequence" >
< 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 >
< td align = "center" > < a href = "../../../../../../index.htm" > Home< / a > < / td >
< td align = "center" > < a href = "../../../../../libraries.htm" > Libraries< / a > < / td >
< td align = "center" > < a href = "../../../../../../people/people.htm" > People< / a > < / td >
< td align = "center" > < a href = "../../../../../../more/faq.htm" > FAQ< / a > < / td >
< 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 >
< 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 >
< a name = "fusion.support.pair.description" > < / a > < h4 >
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< a name = "id466114" > < / a >
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< a href = "pair.html#fusion.support.pair.description" > Description< / a >
< / h4 >
< p >
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 > ,
the first type does not have data. It is used as elements in < span class = "underline" > _map< / span > _s,
for example.
< / p >
< a name = "fusion.support.pair.synopsis" > < / a > < h4 >
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< a name = "id466219" > < / a >
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< a href = "pair.html#fusion.support.pair.synopsis" > Synopsis< / a >
< / h4 >
< 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 >
< 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 >
< 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" > first< / 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" > 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 >
< a name = "fusion.support.pair.template_parameters" > < / a > < h4 >
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< a name = "id466662" > < / a >
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< a href = "pair.html#fusion.support.pair.template_parameters" > Template parameters< / a >
< / h4 >
< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
< / colgroup >
< thead > < tr >
< th >
< p >
Parameter
< / p >
< / th >
< th >
< p >
Description
< / p >
< / th >
< / tr > < / thead >
< tbody >
< tr >
< td >
< p >
First
< / p >
< / td >
< td >
< p >
The first type. This is purely a type. No data is held.
< / p >
< / td >
< / tr >
< tr >
< td >
< p >
Second
< / p >
< / td >
< td >
< p >
The second type. This contains data.
< / p >
< / td >
< / tr >
< / tbody >
< / table > < / div >
< div class = "variablelist" >
< p class = "title" > < b > Notation< / b > < / p >
< dl >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > P< / span > < / tt > < / span > < / dt >
< dd > < p >
Fusion pair type
< / p > < / dd >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > p< / span > < / tt > ,
< tt class = "computeroutput" > < span class = "identifier" > p2< / span > < / tt > < / span > < / dt >
< dd > < p >
Fusion pairs
< / p > < / dd >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > F< / span > < / tt > ,
< tt class = "computeroutput" > < span class = "identifier" > S< / span > < / tt > < / span > < / dt >
< dd > < p >
Arbitrary types
< / p > < / dd >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > s< / span > < / tt > < / span > < / dt >
< dd > < p >
Value of type < tt class = "computeroutput" > < span class = "identifier" > S< / span > < / tt >
< / p > < / dd >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > o< / span > < / tt > < / span > < / dt >
< dd > < p >
Output stream
< / p > < / dd >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > i< / span > < / tt > < / span > < / dt >
< dd > < p >
Input stream
< / p > < / dd >
< / dl >
< / div >
< a name = "fusion.support.pair.expression_semantics" > < / a > < h4 >
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< a name = "id466942" > < / a >
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< a href = "pair.html#fusion.support.pair.expression_semantics" > Expression Semantics< / a >
< / h4 >
< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
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< col >
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< / colgroup >
< thead > < tr >
< th >
< p >
Expression
< / p >
< / th >
< th >
< p >
Semantics
< / p >
< / th >
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< td class = "auto-generated" > <EFBFBD> < / td >
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< / tr > < / thead >
< tbody >
< tr >
< 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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< td class = "auto-generated" > <EFBFBD> < / td >
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< / tr >
< tr >
< 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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< td class = "auto-generated" > <EFBFBD> < / td >
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< / tr >
< tr >
< td >
< p >
< tt class = "computeroutput" > < span class = "identifier" > P< / span > < span class = "special" > ()< / span > < / tt >
< / p >
< / td >
< td >
< p >
Default construction.
< / p >
< / td >
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< td class = "auto-generated" > <EFBFBD> < / td >
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< / tr >
< tr >
< 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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< td class = "auto-generated" > <EFBFBD> < / td >
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< / tr >
< tr >
< 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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< td class = "auto-generated" > <EFBFBD> < / td >
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< / tr >
< tr >
< td >
< p >
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< tt class = "computeroutput" > < span class = "identifier" > p< / span > < span class = "special" > .< / span > < span class = "identifier" > second< / span > < / tt >
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< / p >
< / td >
< td >
< p >
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Get the data from < tt class = "computeroutput" > < span class = "identifier" > p1< / span > < span class = "special" > .]]< / span > < span class = "special" > [[< / span > < / tt > p
= p2< tt class = "computeroutput" > < span class = "special" > ]< / span > < span class = "special" > [< / span > < span class = "identifier" > Assigns< / span > < span class = "identifier" > a< / span >
< span class = "identifier" > pair< / span > < span class = "special" > ,< / span >
< / tt > p1< tt class = "computeroutput" > < span class = "special" > ,< / span > < span class = "identifier" > from< / span >
< span class = "identifier" > another< / span > < span class = "identifier" > pair< / span > < span class = "special" > ,< / span > < / tt > p2< tt class = "computeroutput" > < span class = "special" > .]]< / span >
< span class = "special" > [[< / span > < span class = "identifier" > make_pair< / span > < span class = "special" > < < / span > < span class = "identifier" > F< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )]< / span > < span class = "special" > [< / span > < span class = "identifier" > Make< / span > < span class = "identifier" > a< / span >
< span class = "identifier" > pair< / span > < span class = "identifier" > given< / span >
< span class = "identifier" > the< / span > < span class = "identifier" > first< / span >
< span class = "identifier" > type< / span > < span class = "special" > ,< / span >
< / tt > F< tt class = "computeroutput" > < span class = "special" > ,< / span > < span class = "keyword" > and< / span >
< span class = "identifier" > a< / span > < span class = "identifier" > value< / span >
< span class = "keyword" > for< / span > < span class = "identifier" > the< / span >
< span class = "identifier" > second< / span > < span class = "identifier" > type< / span > < span class = "special" > ,< / span > < / tt > s< tt class = "computeroutput" > < span class = "special" > .< / span >
< span class = "identifier" > The< / span > < span class = "identifier" > second< / span >
< span class = "identifier" > type< / span > < span class = "identifier" > assumes< / span >
< span class = "identifier" > the< / span > < span class = "identifier" > type< / span >
< span class = "identifier" > of< / span > < / tt > s< tt class = "computeroutput" > < span class = "special" > ]]< / span >
< span class = "special" > [[< / span > < / tt > o < < p< tt class = "computeroutput" > < span class = "special" > ]< / span > < span class = "special" > [< / span > < span class = "identifier" > Output< / span > < / tt > p< tt class = "computeroutput" > < span class = "identifier" > to< / span >
< span class = "identifier" > output< / span > < span class = "identifier" > stream< / span > < span class = "special" > ,< / span > < / tt > o< tt class = "computeroutput" > < span class = "special" > .]]< / span >
< span class = "special" > [[< / span > < / tt > i > > p< tt class = "computeroutput" > < span class = "special" > ]< / span > < span class = "special" > [< / span > < span class = "identifier" > Input< / span > < / tt > p< tt class = "computeroutput" > < span class = "identifier" > from< / span >
< span class = "identifier" > input< / span > < span class = "identifier" > stream< / span > < span class = "special" > ,< / span > < / tt > i< tt class = "computeroutput" > < span class = "special" > .]]< / span >
< span class = "special" > [[< / span > < / tt > p == p2< tt class = "computeroutput" > < span class = "special" > ]< / span >
< span class = "special" > [< / span > < span class = "identifier" > Tests< / span >
< span class = "identifier" > two< / span > < span class = "identifier" > pairs< / span >
< span class = "keyword" > for< / span > < span class = "identifier" > equality< / span > < span class = "special" > .]]< / span > < span class = "special" > [[< / span > < / tt > p
!= p2`
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< / p >
< / td >
< td >
< p >
Tests two pairs for inequality.
< / p >
< / td >
< / tr >
< / tbody >
< / table > < / div >
< a name = "fusion.support.pair.header" > < / a > < h4 >
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< a name = "id467922" > < / a >
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< a href = "pair.html#fusion.support.pair.header" > Header< / a >
< / h4 >
< 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 >
< 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 >
< a name = "fusion.support.pair.example" > < / a > < h4 >
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< a name = "id468079" > < / a >
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< a href = "pair.html#fusion.support.pair.example" > Example< / a >
< / h4 >
< 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 >
< 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 >
< / pre >
< / div >
< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" > < tr >
< td align = "left" > < / td >
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< td align = "right" > < div class = "copyright-footer" > Copyright <20> 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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< / p >
< / div > < / td >
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< / 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 >
< / body >
< / html >
