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Extensions
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< / th > < td width = "20%" align = "right" > < a accesskey = "n" href = "ext_algorithms.html" > Next< / a > < / td > < / tr > < / table > < hr / > < / div > < div class = "chapter" > < div class = "titlepage" > < div > < div > < h2 class = "title" > < a id = "manual.ext.util" > < / a > Chapter < / h2 > < / div > < / div > < / div > < p >
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The < code class = "filename" > < functional> < / code > header
contains many additional functors
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and helper functions, extending section 20.3. They are
implemented in the file stl_function.h:
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< / p > < div class = "itemizedlist" > < ul class = "itemizedlist" style = "list-style-type: disc; " > < li class = "listitem" > < p > < code class = "code" > identity_element< / code > for addition and multiplication.
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< / p > < / li > < li class = "listitem" > < p > The functor < code class = "code" > identity< / code > , whose < code class = "code" > operator()< / code >
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returns the argument unchanged.
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< / p > < / li > < li class = "listitem" > < p > Composition functors < code class = "code" > unary_function< / code > and
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< code class = "code" > binary_function< / code > , and their helpers < code class = "code" > compose1< / code >
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and < code class = "code" > compose2< / code > .
< / p > < / li > < li class = "listitem" > < p > < code class = "code" > select1st< / code > and < code class = "code" > select2nd< / code > , to strip pairs.
< / p > < / li > < li class = "listitem" > < p > < code class = "code" > project1st< / code > and < code class = "code" > project2nd< / code > . < / p > < / li > < li class = "listitem" > < p > A set of functors/functions which always return the same result. They
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are < code class = "code" > constant_void_fun< / code > , < code class = "code" > constant_binary_fun< / code > ,
< code class = "code" > constant_unary_fun< / code > , < code class = "code" > constant0< / code > ,
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< code class = "code" > constant1< / code > , and < code class = "code" > constant2< / code > . < / p > < / li > < li class = "listitem" > < p > The class < code class = "code" > subtractive_rng< / code > . < / p > < / li > < li class = "listitem" > < p > mem_fun adaptor helpers < code class = "code" > mem_fun1< / code > and
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< code class = "code" > mem_fun1_ref< / code > are provided for backwards compatibility. < / p > < / li > < / ul > < / div > < p >
20.4.1 can use several different allocators; they are described on the
main extensions page.
< / p > < p >
20.4.3 is extended with a special version of
< code class = "code" > get_temporary_buffer< / code > taking a second argument. The
argument is a pointer, which is ignored, but can be used to specify
the template type (instead of using explicit function template
arguments like the standard version does). That is, in addition to
< / p > < pre class = "programlisting" >
get_temporary_buffer< int> (5);
< / pre > < p >
you can also use
< / p > < pre class = "programlisting" >
get_temporary_buffer(5, (int*)0);
< / pre > < p >
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A class < code class = "code" > temporary_buffer< / code > is given in stl_tempbuf.h.
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< / p > < p >
The specialized algorithms of section 20.4.4 are extended with
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< code class = "code" > uninitialized_copy_n< / code > .
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