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< a name = "fusion.tuple.pairs" > < / a > < a href = "pairs.html" title = "Pairs" > Pairs< / a > < / h3 > < / div > < / div > < / div >
< a name = "fusion.tuple.pairs.description" > < / a > < h4 >
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< a name = "id642908" > < / a >
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< a href = "pairs.html#fusion.tuple.pairs.description" > Description< / a >
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< p >
The < a href = "http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1403.pdf" target = "_top" > TR1
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Tuple< / a > interface is specified to provide uniform access to < tt class = "computeroutput" > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > pair< / span > < / tt >
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as if it were a 2 element tuple.
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< a name = "fusion.tuple.pairs.specification" > < / a > < h4 >
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< a name = "id642964" > < / a >
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< a href = "pairs.html#fusion.tuple.pairs.specification" > Specification< / a >
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< pre class = "programlisting" >
< span class = "identifier" > tuple_size< / span > < span class = "special" > < < / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > pair< / span > < span class = "special" > < < / span > < span class = "identifier" > T1< / span > < span class = "special" > ,< / span > < span class = "identifier" > T2< / span > < span class = "special" > > < / span > < span class = "special" > > ::< / span > < span class = "identifier" > value< / span >
< / pre >
< p >
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< span class = "bold" > < b > Type< / b > < / span > : An < a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
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Integral Constant< / a >
< / p >
< p >
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< span class = "bold" > < b > Value< / b > < / span > : Returns 2, the number of elements
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in a pair.
< / p >
< pre class = "programlisting" >
< span class = "identifier" > tuple_element< / span > < span class = "special" > < < / span > < span class = "number" > 0< / span > < span class = "special" > ,< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > pair< / span > < span class = "special" > < < / span > < span class = "identifier" > T1< / span > < span class = "special" > ,< / span > < span class = "identifier" > T2< / span > < span class = "special" > > < / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span >
< / pre >
< p >
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< span class = "bold" > < b > Type< / b > < / span > : < tt class = "computeroutput" > < span class = "identifier" > T1< / span > < / tt >
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< / p >
< p >
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< span class = "bold" > < b > Value< / b > < / span > : Returns the type of the first element
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of the pair
< / p >
< pre class = "programlisting" >
< span class = "identifier" > tuple_element< / span > < span class = "special" > < < / span > < span class = "number" > 1< / span > < span class = "special" > ,< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > pair< / span > < span class = "special" > < < / span > < span class = "identifier" > T1< / span > < span class = "special" > ,< / span > < span class = "identifier" > T2< / span > < span class = "special" > > < / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span >
< / pre >
< p >
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< span class = "bold" > < b > Type< / b > < / span > : < tt class = "computeroutput" > < span class = "identifier" > T2< / span > < / tt >
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< / p >
< p >
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< span class = "bold" > < b > Value< / b > < / span > : Returns thetype of the second element
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of the pair
< / p >
< pre class = "programlisting" >
< span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > int< / span > < span class = "identifier" > I< / span > < span class = "special" > ,< / span > < span class = "keyword" > typename< / span > < span class = "identifier" > T1< / span > < span class = "special" > ,< / span > < span class = "keyword" > typename< / span > < span class = "identifier" > T2< / span > < span class = "special" > > < / span >
< span class = "identifier" > P< / span > < span class = "special" > & < / span > < span class = "identifier" > get< / span > < span class = "special" > (< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > pair< / span > < span class = "special" > < < / span > < span class = "identifier" > T1< / span > < span class = "special" > ,< / span > < span class = "identifier" > T2< / span > < span class = "special" > > & < / span > < span class = "identifier" > pr< / span > < span class = "special" > );< / span >
< span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > int< / span > < span class = "identifier" > I< / span > < span class = "special" > ,< / span > < span class = "keyword" > typename< / span > < span class = "identifier" > T1< / span > < span class = "special" > ,< / span > < span class = "keyword" > typename< / span > < span class = "identifier" > T2< / span > < span class = "special" > > < / span >
< span class = "keyword" > const< / span > < span class = "identifier" > P< / span > < span class = "special" > & < / span > < span class = "identifier" > get< / span > < span class = "special" > (< / span > < span class = "keyword" > const< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > pair< / span > < span class = "special" > < < / span > < span class = "identifier" > T1< / span > < span class = "special" > ,< / span > < span class = "identifier" > T2< / span > < span class = "special" > > & < / span > < span class = "identifier" > pr< / span > < span class = "special" > );< / span >
< / pre >
< p >
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< span class = "bold" > < b > Type< / b > < / span > : If < tt class = "computeroutput" > < span class = "identifier" > I< / span >
< span class = "special" > ==< / span > < span class = "number" > 0< / span > < / tt >
< tt class = "computeroutput" > < span class = "identifier" > P< / span > < / tt > is < tt class = "computeroutput" > < span class = "identifier" > T1< / span > < / tt > ,
else if < tt class = "computeroutput" > < span class = "identifier" > I< / span > < span class = "special" > ==< / span >
< span class = "number" > 1< / span > < / tt > < tt class = "computeroutput" > < span class = "identifier" > P< / span > < / tt >
is < tt class = "computeroutput" > < span class = "identifier" > T2< / span > < / tt > else the program is
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ill-formed.
< / p >
< p >
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< span class = "bold" > < b > Returns: < tt class = "computeroutput" > < span class = "identifier" > pr< / span > < span class = "special" > .< / span > < span class = "identifier" > first< / span > < / tt >
if < tt class = "computeroutput" > < span class = "identifier" > I< / span > < span class = "special" > ==< / span >
< span class = "number" > 0< / span > < / tt > else < tt class = "computeroutput" > < span class = "identifier" > pr< / span > < span class = "special" > .< / span > < span class = "identifier" > second< / span > < / tt > .< / b > < / span > [*Returns:
< tt class = "computeroutput" > < span class = "identifier" > pr< / span > < span class = "special" > .< / span > < span class = "identifier" > first< / span > < / tt > if < tt class = "computeroutput" > < span class = "identifier" > I< / span >
< span class = "special" > ==< / span > < span class = "number" > 0< / span > < / tt >
else < tt class = "computeroutput" > < span class = "identifier" > pr< / span > < span class = "special" > .< / span > < span class = "identifier" > second< / span > < / tt > .
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< td align = "right" > < div class = "copyright-footer" > Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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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