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< div class = "titlepage" >< div >< div >< h4 class = "title" >
< a name = "fusion.tuple.class_template_tuple.construction" ></ a >< a href = "construction.html" title = "Construction" > Construction</ a ></ h4 ></ div ></ div ></ div >
< a name = "fusion.tuple.class_template_tuple.construction.description" ></ a >< h5 >
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< a name = "id636829" ></ a >
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< a href = "construction.html#fusion.tuple.class_template_tuple.construction.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
Tuple</ a > type provides a default constructor, a constructor that takes
initializers for all of its elements, a copy constructor, and a converting
copy constructor. The details of the various constructors are described
in this section.
</ p >
< a name = "fusion.tuple.class_template_tuple.construction.specification" ></ a >< h5 >
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< a name = "id636873" ></ a >
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< a href = "construction.html#fusion.tuple.class_template_tuple.construction.specification" > Specification</ a >
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< div class = "variablelist" >
< p class = "title" >< b > Notation</ b ></ p >
< dl >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > T1</ span >
< span class = "special" > ...</ span > < span class = "identifier" > TN</ span ></ tt > ,
< tt class = "computeroutput" >< span class = "identifier" > U1</ span > < span class = "special" > ...</ span >
< span class = "identifier" > UN</ span ></ tt ></ span ></ dt >
< dd >< p >
Tuple element types
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > P1</ span >
< span class = "special" > ...</ span > < span class = "identifier" > PN</ span ></ tt ></ span ></ dt >
< dd >< p >
Parameter types
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > Ti</ span ></ tt > ,
< tt class = "computeroutput" >< span class = "identifier" > Ui</ span ></ tt ></ span ></ dt >
< dd >< p >
The type of the < tt class = "computeroutput" >< span class = "identifier" > i</ span ></ tt > th
element of a tuple
</ p ></ dd >
< dt >< span class = "term" >< tt class = "computeroutput" >< span class = "identifier" > Pi</ span ></ tt ></ span ></ dt >
< dd >< p >
The type of the < tt class = "computeroutput" >< span class = "identifier" > i</ span ></ tt > th
parameter
</ p ></ dd >
</ dl >
</ div >
< pre class = "programlisting" >
< span class = "identifier" > tuple</ span >< span class = "special" > ();</ span >
</ pre >
< p >
< span class = "bold" >< b > Requirements</ b ></ span > : Each < tt class = "computeroutput" >< span class = "identifier" > Ti</ span ></ tt >
is default constructable.
</ p >
< p >
< span class = "bold" >< b > Semantics</ b ></ span > : Default initializes each element
of the tuple.
</ p >
< pre class = "programlisting" >
< span class = "identifier" > tuple</ span >< span class = "special" > (</ span >< span class = "identifier" > P1</ span >< span class = "special" > ,</ span >< span class = "identifier" > P2</ span >< span class = "special" > ,...,</ span >< span class = "identifier" > PN</ span >< span class = "special" > );</ span >
</ pre >
< p >
< span class = "bold" >< b > Requirements</ b ></ span > : Each < tt class = "computeroutput" >< span class = "identifier" > Pi</ span ></ tt >
is < tt class = "computeroutput" >< span class = "identifier" > Ti</ span ></ tt > if < tt class = "computeroutput" >< span class = "identifier" > Ti</ span ></ tt > is a reference type, < tt class = "computeroutput" >< span class = "keyword" > const</ span > < span class = "identifier" > Ti</ span >< span class = "special" > & </ span ></ tt > otherwise.
</ p >
< p >
< span class = "bold" >< b > Semantics</ b ></ span > : Copy initializes each element
with the corresponding parameter.
</ p >
< pre class = "programlisting" >
< span class = "identifier" > tuple</ span >< span class = "special" > (</ span >< span class = "keyword" > const</ span > < span class = "identifier" > tuple</ span >< span class = "special" > & </ span > < span class = "identifier" > t</ span >< span class = "special" > );</ span >
</ pre >
< p >
< span class = "bold" >< b > Requirements</ b ></ span > : Each < tt class = "computeroutput" >< span class = "identifier" > Ti</ span ></ tt >
should be copy constructable.
</ p >
< p >
< span class = "bold" >< b > Semantics</ b ></ span > : Copy constructs each element
of < tt class = "computeroutput" >< span class = "special" > *</ span >< span class = "keyword" > this</ span ></ tt >
with the corresponding element of < tt class = "computeroutput" >< span class = "identifier" > t</ span ></ tt > .
</ p >
< pre class = "programlisting" >
< span class = "keyword" > template</ span >< span class = "special" > < </ span >< span class = "keyword" > typename</ span > < span class = "identifier" > U1</ span >< span class = "special" > ,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > U2</ span >< span class = "special" > ,</ span > < span class = "special" > ...,</ span > < span class = "keyword" > typename</ span > < span class = "identifier" > UN</ span >< span class = "special" > > </ span >
< span class = "identifier" > tuple</ span >< span class = "special" > (</ span >< span class = "keyword" > const</ span > < span class = "identifier" > tuple</ span >< span class = "special" > < </ span >< span class = "identifier" > U1</ span >< span class = "special" > ,</ span > < span class = "identifier" > U2</ span >< span class = "special" > ,</ span > < span class = "special" > ...,</ span > < span class = "identifier" > UN</ span >< span class = "special" > >& </ span > < span class = "identifier" > t</ span >< span class = "special" > );</ span >
</ pre >
< p >
< span class = "bold" >< b > Requirements</ b ></ span > : Each < tt class = "computeroutput" >< span class = "identifier" > Ti</ span ></ tt >
shall be constructible from the corresponding < tt class = "computeroutput" >< span class = "identifier" > Ui</ span ></ tt > .
</ p >
< p >
< span class = "bold" >< b > Semantics</ b ></ span > : Constructs each element of
< tt class = "computeroutput" >< span class = "special" > *</ span >< span class = "keyword" > this</ span ></ tt >
with the corresponding element of < tt class = "computeroutput" >< span class = "identifier" > t</ span ></ tt > .
</ p >
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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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