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It is provided "as is" without express or implied warranty. -- --><Head><Title>project2nd<Arg1, Arg2></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>project2nd<Arg1, Arg2></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>Project2nd</tt> is a <A href="functors.html">function object</A> that takes two arguments andreturns its second argument; the first argument is unused.It is essentially a generalization of<tt><A href="identity.html">identity</A></tt> to the case of a <A href="BinaryFunction.html">Binary Function</A>.<h3>Example</h3><pre>int main(){ <A href="Vector.html">vector</A><char*> v1(10, (char*) 0); <A href="Vector.html">vector</A><int> v2(10, 137); <A href="Vector.html">vector</A><int> result(10); <A href="transform.html">transform</A>(v1.begin(), v1.end(), v2.begin(), result.begin(), project2nd<char*, int>()); assert(<A href="equal.html">equal</A>(v2.begin(), v2.end(), result.begin()));} </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>.This function object is an SGI extension; it is not part of the C++standard.<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><tt>project2nd</tt>'s first argument type.</TD><TD VAlign=top> </TD></TR><TR><TD VAlign=top><tt>Arg2</tt></TD><TD VAlign=top><tt>project2nd</tt>'s second argument type, and its result type.</TD><TD VAlign=top> </TD></tr></table><h3>Model of</h3><A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A><h3>Type requirements</h3>None.<h3>Public base classes</h3><A href="binary_function.html">binary_function</A><Arg1, Arg2, Arg2><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 <tt>project2nd</tt>'s first argument: <tt>Arg1</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 <tt>project2nd</tt>'s second argument: <tt>Arg2</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>Arg2</tt>.</TD></TR><TR><TD VAlign=top><tt>Arg1 operator()(const Arg1&, const Arg2& y) const</tt></TD><TD VAlign=top> <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A></TD><TD VAlign=top>Function call. The return value is <tt>y</tt>.</TD></tr></table><h3>New members</h3>All of <tt>project2nd</tt>'s members are defined in the <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>requirements. <tt>project2nd</tt> does not introduce any new members.<h3>Notes</h3><h3>See also</h3><A href="functors.html">Function objects</A>, <tt><A href="identity.html">identity</A></tt>, <tt><A href="project1st.html">project1st</A></tt>, <tt><A href="select1st.html">select1st</A></tt>, <tt><A href="select2nd.html">select2nd</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> ⌨️ 快捷键说明
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