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<H1>binary_function&lt;Arg1, Arg2, Result&gt;</H1>

<Table CellPadding=0 CellSpacing=0 width=100%>
<TR>
<TD Align=left><Img src = "functors.gif" Alt=""   WIDTH = "194"  HEIGHT = "38" ></TD>
<TD Align=right><Img src = "type.gif" Alt=""   WIDTH = "194"  HEIGHT = "39" ></TD>
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<TR>
<TD Align=left VAlign=top><b>Category</b>: functors</TD>
<TD Align=right VAlign=top><b>Component type</b>: type</TD>
</TR>
</Table>

<h3>Description</h3>
<tt>Binary_function</tt> is an empty base class: it contains no member
functions or member variables, but only type information.  The
only reason it exists is to make it more convenient to define
types that are models of the concept <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>.
Specifically, any model of <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A> must define
nested <tt>typedef</tt>s.  Those <tt>typedef</tt>s are provided by the base
class <tt>binary_function</tt>.
<h3>Example</h3>
<pre>
struct exponentiate : public binary_function&lt;double, double, double&gt; {
    double operator()(double x, double y) { return pow(x, y); }
};
</pre>
<h3>Definition</h3>
Defined in <A href="function.h">function.h</A>.
<h3>Template parameters</h3>
<Table border>
<TR>
<TH>
Parameter
</TH>
<TH>
Description
</TH>
<TH>
Default
</TH>
</TR>
<TR>
<TD VAlign=top>
<tt>Arg1</tt>
</TD>
<TD VAlign=top>
The function object's first argument type
</TD>
<TD VAlign=top>
&nbsp;
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>Arg2</tt>
</TD>
<TD VAlign=top>
The function object's second argument type
</TD>
<TD VAlign=top>
&nbsp;
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>Result</tt>
</TD>
<TD VAlign=top>
The function object's result type
</TD>
<TD VAlign=top>
&nbsp;
</TD>
</tr>
</table>
<h3>Model of</h3>
<A href="Assignable.html">Assignable</A>, <A href="DefaultConstructible.html" tppabs="http://www.sgi.com/Technology/STL/DefaultConstructible.shtml">Default Constructible</A>
<h3>Type requirements</h3>
<h3>Public base classes</h3>
None.
<h3>Members</h3>
<Table border>
<TR>
<TH>
Member
</TH>
<TH>
Where defined
</TH>
<TH>
Description
</TH>
</TR>
<TR>
<TD VAlign=top>
<tt>first_argument_type</tt>
</TD>
<TD VAlign=top>
<tt>unary_function</tt>
</TD>
<TD VAlign=top>
See below.
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>second_argument_type</tt>
</TD>
<TD VAlign=top>
<tt>unary_function</tt>
</TD>
<TD VAlign=top>
See below.
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>result_type</tt>
</TD>
<TD VAlign=top>
<tt>unary_function</tt>
</TD>
<TD VAlign=top>
See below.
</TD>
</tr>
</table>
<h3>New members</h3>
These members are not defined in the 
<A href="Assignable.html">Assignable</A> and <A href="DefaultConstructible.html" tppabs="http://www.sgi.com/Technology/STL/DefaultConstructible.shtml">Default Constructible</A>
requirements, but are specific to 
<tt>unary_function</tt>.
<Table border>
<TR>
<TH>
Member
</TH>
<TH>
Description
</TH>
</TR>
<TR>
<TD VAlign=top>
<tt>first_argument_type</tt>
</TD>
<TD VAlign=top>
The function object's first argument type.  This is a <tt>typedef</tt> for the
   template parameter <tt>Arg1</tt>.
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>second_argument_type</tt>
</TD>
<TD VAlign=top>
The function object's second argument type.  This is a <tt>typedef</tt> for the
   template parameter <tt>Arg2</tt>.
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>result_type</tt>
</TD>
<TD VAlign=top>
The function object's result type.  This is a <tt>typedef</tt> for the
   template parameter <tt>Result</tt>.
</TD>
</tr>
</table>
<h3>Notes</h3>
<h3>See also</h3>
The <A href="functors.html">Function Object</A> overview, <A href="AdaptableBinaryFunction.html" tppabs="http://www.sgi.com/Technology/STL/AdaptableBinaryFunction.shtml">Adaptable Binary Function</A>,
<tt><A href="unary_function.html">unary_function</A></tt>

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