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Extensions
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< / th > < td width = "20%" align = "right" > < a accesskey = "n" href = "ext_iterators.html" > Next< / a > < / td > < / tr > < / table > < hr / > < / div > < div class = "chapter" > < div class = "titlepage" > < div > < div > < h2 class = "title" > < a id = "manual.ext.numerics" > < / a > Chapter < / h2 > < / div > < / div > < / div > < p > 26.4, the generalized numeric operations such as < code class = "code" > accumulate< / code > ,
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are extended with the following functions:
< / p > < pre class = "programlisting" >
power (x, n);
power (x, n, monoid_operation);< / pre > < p > Returns, in FORTRAN syntax, "< code class = "code" > x ** n< / code > " where
< code class = "code" > n > = 0< / code > . In the
case of < code class = "code" > n == 0< / code > , returns the identity element for the
monoid operation. The two-argument signature uses multiplication (for
a true "power" implementation), but addition is supported as well.
The operation functor must be associative.
< / p > < p > The < code class = "code" > iota< / code > function wins the award for Extension With the
Coolest Name (the name comes from Ken Iverson's APL language.) As
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described in the < a class = "link" href = "http://www.sgi.com/tech/stl/iota.html" target = "_top" > SGI
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documentation< / a > , it "assigns sequentially increasing values to a range.
That is, it assigns < code class = "code" > value< / code > to < code class = "code" > *first< / code > ,
< code class = "code" > value + 1< / code > to< code class = "code" > *(first + 1)< / code > and so on."
< / p > < pre class = "programlisting" >
void iota(_ForwardIter first, _ForwardIter last, _Tp value);< / pre > < p > The < code class = "code" > iota< / code > function is included in the ISO C++ 2011 standard.
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