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<HTML><!-- -- Copyright (c) 1996-1999 -- Silicon Graphics Computer Systems, Inc. -- -- Permission to use, copy, modify, distribute and sell this software -- and its documentation for any purpose is hereby granted without fee, -- provided that the above copyright notice appears in all copies and -- that both that copyright notice and this permission notice appear -- in supporting documentation. Silicon Graphics makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- -- Copyright (c) 1994 -- Hewlett-Packard Company -- -- Permission to use, copy, modify, distribute and sell this software -- and its documentation for any purpose is hereby granted without fee, -- provided that the above copyright notice appears in all copies and -- that both that copyright notice and this permission notice appear -- in supporting documentation. Hewlett-Packard Company makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- --><Head><Title>plus<T></Title><!-- Generated by htmldoc --></HEAD><BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" ALINK="#ff0000"> <IMG SRC="CorpID.gif" ALT="SGI" HEIGHT="43" WIDTH="151"> <!--end header--><BR Clear><H1>plus<T></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></TR><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>Plus<T></tt> is a <A href="functors.html">function object</A>. Specifically, it is an <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>. If <tt>f</tt> is an object of class<tt>plus<T></tt> and <tt>x</tt> and <tt>y</tt> are objects of class <tt>T</tt>, then<tt>f(x,y)</tt> returns <tt>x+y</tt>.<h3>Example</h3>Each element in <tt>V3</tt> will be the sum of the corresponding elementsin <tt>V1</tt> and <tt>V2</tt><pre>const int N = 1000;<A href="Vector.html">vector</A><double> V1(N);<A href="Vector.html">vector</A><double> V2(N);<A href="Vector.html">vector</A><double> V3(N);<A href="iota.html">iota</A>(V1.begin(), V1.end(), 1);<A href="fill.html">fill</A>(V2.begin(), V2.end(), 75);assert(V2.size() >= V1.size() && V3.size() >= V1.size());<A href="transform.html">transform</A>(V1.begin(), V1.end(), V2.begin(), V3.begin(), plus<double>());</pre><h3>Definition</h3>Defined in the standard header <A href="functional">functional</A>, and in the nonstandardbackward-compatibility header <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>T</tt></TD><TD VAlign=top>The function object's argument type and result type.</TD><TD VAlign=top> </TD></tr></table><h3>Model of</h3><A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>, <A href="DefaultConstructible.html">Default Constructible</A><h3>Type requirements</h3><tt>T</tt> must be a numeric type; if <tt>x</tt> and <tt>y</tt> are objects of type <tt>T</tt>,then <tt>x+y</tt> must be defined and must have a return type that isconvertible to <tt>T</tt>. <tt>T</tt> must be <A href="Assignable.html">Assignable</A>.<h3>Public base classes</h3><tt><A href="binary_function.html">binary_function</A><T, T, T></tt><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> <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A></TD><TD VAlign=top>The type of the first argument: <tt>T</tt></TD></TR><TR><TD VAlign=top><tt>second_argument_type</tt></TD><TD VAlign=top> <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A></TD><TD VAlign=top>The type of the second argument: <tt>T</tt></TD></TR><TR><TD VAlign=top><tt>result_type</tt></TD><TD VAlign=top> <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A></TD><TD VAlign=top>The type of the result: <tt>T</tt></TD></TR><TR><TD VAlign=top><tt>T operator()(const T& x, const T& y)</tt></TD><TD VAlign=top> <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A></TD><TD VAlign=top>Function call operator. The return value is <tt>x + y</tt>.</TD></TR><TR><TD VAlign=top><tt>plus()</tt></TD><TD VAlign=top> <A href="DefaultConstructible.html">Default Constructible</A></TD><TD VAlign=top>The default constructor.</TD></tr></table><h3>New members</h3>All of <tt>plus</tt>'s members are defined in the<A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A> and <A href="DefaultConstructible.html">Default Constructible</A>requirements. <tt>Plus</tt> does not introduce any new members.<h3>Notes</h3><h3>See also</h3>The <A href="functors.html">Function Object</A> overview, <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>,<tt><A href="binary_function.html">binary_function</A></tt>, <tt><A href="minus.html">minus</A></tt>, <tt><A href="times.html">multiplies</A></tt>,<tt><A href="divides.html">divides</A></tt>, <tt><A href="modulus.html">modulus</A></tt>, <tt><A href="negate.html">negate</A></tt><!--start footer--> <HR SIZE="6"><A href="http://www.sgi.com/"><IMG SRC="surf.gif" HEIGHT="54" WIDTH="54" ALT="[Silicon Surf]"></A><A HREF="index.html"><IMG SRC="stl_home.gif" HEIGHT="54" WIDTH="54" ALT="[STL Home]"></A><BR><FONT SIZE="-2"><A href="http://www.sgi.com/Misc/sgi_info.html" TARGET="_top">Copyright © 1999 Silicon Graphics, Inc.</A> All Rights Reserved.</FONT><FONT SIZE="-3"><a href="http://www.sgi.com/Misc/external.list.html" TARGET="_top">TrademarkInformation</A></FONT><P></BODY></HTML> ?? 快捷鍵說明
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