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<Title>generate</Title>
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<H1>generate</H1>
<Table CellPadding=0 CellSpacing=0 width=100%>
<TR>
<TD Align=left><Img src = "algorithms.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
<TD Align=right><Img src = "function.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
</TR>
<TR>
<TD Align=left VAlign=top><b>Category</b>: algorithms</TD>
<TD Align=right VAlign=top><b>Component type</b>: function</TD>
</TR>
</Table>
<h3>Prototype</h3>
<pre>
template <class <A href="ForwardIterator.html">ForwardIterator</A>, class <A href="Generator.html">Generator</A>>
void generate(ForwardIterator first, ForwardIterator last, Generator gen);
</pre>
<h3>Description</h3>
<tt>Generate</tt> assigns the result of invoking <tt>gen</tt>, a <A href="functors.html">function object</A>
that takes no arguments, to each element in the range <tt>[first,
last)</tt>. <A href="#1">[1]</A>
<h3>Definition</h3>
Defined in the standard header <A href="algorithm">algorithm</A>, and in the nonstandard
backward-compatibility header <A href="algo.h">algo.h</A>.
<h3>Requirements on types</h3>
<UL>
<LI>
<tt>ForwardIterator</tt> is a model of <A href="ForwardIterator.html">Forward Iterator</A>. <A href="#2">[2]</A>
<LI>
<tt>ForwardIterator</tt> is mutable.
<LI>
<tt>Generator</tt> is a model of <A href="Generator.html">Generator</A>.
<LI>
<tt>Generator</tt>'s result type is convertible to <tt>ForwardIterator</tt>'s
value type.
</UL>
<h3>Preconditions</h3>
<UL>
<LI>
<tt>[first, last)</tt> is a valid range.
</UL>
<h3>Complexity</h3>
Linear. Exactly <tt>last - first</tt> invocations of <tt>gen</tt>. <A href="#1">[1]</A>
<h3>Example</h3>
Fill a vector with random numbers, using the standard C library function
<tt>rand</tt>.
<pre>
vector<int> V;
...
generate(V.begin(), V.end(), rand);
</pre>
<h3>Notes</h3>
<P><A name="1">[1]</A>
The <A href="functors.html">function object</A> <tt>gen</tt> is invoked for each iterator in
the range <tt>[first, last)</tt>, as opposed to just being invoked a
single time outside the loop. This distinction is important
because a <A href="Generator.html">Generator</A> need not return the same result each time
it is invoked; it is permitted to read from a file, refer to and
modify local state, and so on.
<P><A name="2">[2]</A>
The reason that <tt>generate</tt> requires its argument to be a mutable
<A href="ForwardIterator.html">Forward Iterator</A>, rather than just an <A href="OutputIterator.html">Output Iterator</A>, is that
it uses a range <tt>[first, last)</tt> of iterators. There is no sensible
way to describe a range of <A href="OutputIterator.html">Output Iterators</A>, because it is
impossible to compare two <A href="OutputIterator.html">Output Iterators</A> for equality.
The <tt><A href="generate_n.html">generate_n</A></tt> algorithm does have an interface that permits use of
an <A href="OutputIterator.html">Output Iterator</A>.
<h3>See also</h3>
<tt><A href="copy.html">copy</A></tt>, <tt><A href="fill.html">fill</A></tt>, <tt><A href="fill_n.html">fill_n</A></tt>, <tt><A href="generate_n.html">generate_n</A></tt>, <tt><A href="iota.html">iota</A></tt>
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