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<Head>
<Title>Adaptable Generator</Title>
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<H1>Adaptable Generator</H1>
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<TR>
<TD Align=left><Img src = "functors.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
<TD Align=right><Img src = "concept.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
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<TD Align=left VAlign=top><b>Category</b>: functors</TD>
<TD Align=right VAlign=top><b>Component type</b>: concept</TD>
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</Table>
<h3>Description</h3>
An Adaptable Generator is a <A href="Generator.html">Generator</A> with a nested
<tt>typedef</tt> that defines its result type. <A href="#1">[1]</A> This nested <tt>typedef</tt> makes
it possible to use function object adaptors.
<h3>Refinement of</h3>
<A href="Generator.html">Generator</A>
<h3>Associated types</h3>
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<TD VAlign=top>
Result type
</TD>
<TD VAlign=top>
<tt>F::result_type</tt>
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<TD VAlign=top>
The type returned when the Generator is called
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<h3>Notation</h3>
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<TD VAlign=top>
<tt>F</tt>
</TD>
<TD VAlign=top>
A type that is a model of Adaptable Generator
</TD>
</tr>
</table>
<h3>Definitions</h3>
<h3>Valid expressions</h3>
None, except for those defined by <A href="Generator.html">Generator</A>
<h3>Expression semantics</h3>
<h3>Complexity guarantees</h3>
<h3>Invariants</h3>
<h3>Models</h3>
The STL does not include any types that are models of Adaptable
Generator. An example of a user-defined Adaptable Generator is
as follows.
<pre>
struct counter
{
typedef int result_type;
counter() : n(0) {}
result_type operator()() { return n++; }
result_type n;
};
</pre>
<h3>Notes</h3>
<P><A name="1">[1]</A>
Note the implication of this: a function pointer <tt>T (*f)()</tt>
is a <A href="Generator.html">Generator</A>, but not an Adaptable Generator: the
expression <tt>f::result_type</tt> is nonsensical.
<h3>See also</h3>
<A href="Generator.html">Generator</A>, <A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A>, <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>
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