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< title > BOOST_PP_TUPLE_ELEM< / title >
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< div style = "margin-left: 0px;" > The < b > BOOST_PP_TUPLE_ELEM< / b >
macro extracts an element from a < i > tuple< / i > . < / div >
< h4 > Usage< / h4 >
< div class = "code" > < b > BOOST_PP_TUPLE_ELEM< / b > (< i > i< / i > , < i > tuple< / i > )
< a
href="file:///E:/Programming/VersionControl/modular-boost/libs/preprocessor/doc/topics/variadic_macros.html#VNotation"
target="_self">< sup > (v)< / sup > < / a > < br >
< br >
or< br >
< br >
< b > BOOST_PP_TUPLE_ELEM< / b > (< i > size< / i > , < i > i< / i > , < i > tuple< / i > )
< a href = "../topics/variadic_macros.html#VNotation" target = "_self" > < sup > (v)< / sup > < / a > < br >
< / div >
< h4 > Arguments< / h4 >
< dl >
< dt > size< / dt >
< dd > The size of the < i > tuple< / i > . The size is ignored.< br >
< / dd >
< dt > i< / dt >
< dd > The zero-based index into the < i > tuple< / i > of the element to
be extracted. Valid values range from < i > 0< / i > to < i > size< / i >
- < i > 1< / i > . < / dd >
< dt > tuple< / dt >
< dd > The < i > tuple< / i > from which an element is to be extracted. < / dd >
< / dl >
< h4 > Remarks< / h4 >
< div > You can invoke the variadic macro as BOOST_PP_TUPLE_ELEM(< i > i< / i > ,< i > tuple< / i > ),
or BOOST_PP_TUPLE_ELEM(< i > size< / i > ,< i > i< / i > ,< i > tuple< / i > ) for
backward compatibility. < / div >
< h4 > See Also< / h4 >
< ul >
< li > < a href = "limit_tuple.html" > BOOST_PP_LIMIT_TUPLE< / a > < / li >
< / ul >
< h4 > Requirements< / h4 >
< div > < b > Header:< / b > < a href = "../headers/tuple/elem.html" > < boost/preprocessor/tuple/elem.hpp> < / a >
< / div >
< h4 > Sample Code< / h4 >
< div >
< pre > #include < < a href = "../headers/tuple/elem.html" > boost/preprocessor/tuple/elem.hpp< / a > > < br > < br > #define TUPLE (a, b, c, d)< br > < br > < a href = "tuple_elem.html" > BOOST_PP_TUPLE_ELEM< / a > (0, TUPLE) // expands to a in the variadic version< br > < a href = "tuple_elem.html" > BOOST_PP_TUPLE_ELEM< / a > (3, TUPLE) // expands to d in the variadic version< br > < / pre >
< / div >
< hr size = "1" >
< div style = "margin-left: 0px;" > < i > <EFBFBD> Copyright < a
href="http://www.housemarque.com" target="_top">Housemarque Oy< / a >
2002< / i > < br >
< i > <EFBFBD> Copyright Paul Mensonides 2002< br >
< / i > < i > <EFBFBD> Copyright Edward Diener 2011,2013,2020< / i > < br >
< / div >
< div style = "margin-left: 0px;" >
< p > < small > Distributed under the Boost Software License, Version
1.0. (See accompanying file < a
href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt< / a > or
copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" > www.boost.org/LICENSE_1_0.txt< / a > )< / small > < / p >
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