📄 binder1st.html
字号:
<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>binder1st<AdaptableBinaryFunction></Title><!-- Generated by htmldoc --></HEAD><BODY TEXT="#000000" LINK="#006600" ALINK="#003300" VLINK="#7C7F87" BGCOLOR="#FFFFFF"><A HREF="/"><IMG SRC="/images/common/sgilogo_small.gif" ALT="SGI Logo" WIDTH="80" HEIGHT="72" BORDER="0"></A><P><!--end header--><BR Clear><H1>binder1st<AdaptableBinaryFunction></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 = "38" ></TD></TR><TR><TD Align=left><Img src = "adaptors.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right></TD></TR><TR><TD Align=left VAlign=top><b>Categories</b>: functors, adaptors</TD><TD Align=right VAlign=top><b>Component type</b>: type</TD></TR></Table><h3>Description</h3><tt>Binder1st</tt> is a <A href="functors.html">function object</A> adaptor: it is used to transforman <A href="AdaptableBinaryFunction.html">adaptable binary function</A> into an <A href="AdaptableUnaryFunction.html">adaptable unary function</A>. Specifically, if <tt>f</tt> is an object of class<tt>binder1st<AdaptableBinaryFunction></tt>, then <tt>f(x)</tt> returns <tt>F(c, x)</tt>, where <tt>F</tt> is an object of class <tt>AdaptableBinaryFunction</tt>and where <tt>c</tt> is a constant. Both <tt>F</tt> and <tt>c</tt> are passed as arguments to<tt>binder1st</tt>'s constructor. <A href="#1">[1]</A> <P>The easiest way to create a <tt>binder1st</tt> is not to call the constructorexplicitly, but instead to use the helper function <tt>bind1st</tt>.<h3>Example</h3>Finds the first nonzero element in a list.<pre><A href="List.html">list</A><int> L;...<A href="List.html">list</A><int>::iterator first_nonzero = <A href="find_if.html">find_if</A>(L.begin(), L.end(), bind1st(<A href="not_equal_to.html">not_equal_to</A><int>(), 0));assert(first_nonzero == L.end() || *first_nonzero != 0);</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>AdaptableBinaryFunction</tt></TD><TD VAlign=top>The type of the binary function whose first argument is being bound to a constant.</TD><TD VAlign=top> </TD></tr></table><h3>Model of</h3><A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A><h3>Type requirements</h3><tt>AdaptableBinaryFunction</tt> must be a model of <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A>. <h3>Public base classes</h3><pre><A href="unary_function.html">unary_function</A><<A href="AdaptableBinaryFunction.html">AdaptableBinaryFunction</A>::second_argument_type, <A href="AdaptableBinaryFunction.html">AdaptableBinaryFunction</A>::result_type></pre><h3>Members</h3><Table border><TR><TH>Member</TH><TH>Where defined</TH><TH>Description</TH></TR><TR><TD VAlign=top><tt>argument_type</tt></TD><TD VAlign=top> <A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A></TD><TD VAlign=top>The type of the function object's argument, which is <tt>AdaptableBinaryFunction::second_argument_type</tt></TD></TR><TR><TD VAlign=top><tt>result_type</tt></TD><TD VAlign=top> <A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A></TD><TD VAlign=top>The type of the result: <tt>AdaptableBinaryFunction::result_type</tt></TD></TR><TR><TD VAlign=top><pre>result_type operator()(const argument_type& x) const</pre></TD><TD VAlign=top> <A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A></TD><TD VAlign=top>Function call. Returns <tt>F(c, x)</tt>, where <tt>F</tt> and <tt>c</tt> are thearguments with which this <tt>binder1st</tt> was constructed.</TD></TR><TR><TD VAlign=top><pre>binder1st(const AdaptableBinaryFunction& F, AdaptableBinaryFunction::first_argument_type c)</pre></TD><TD VAlign=top><tt>binder1st</tt></TD><TD VAlign=top>See below</TD></TR><TR><TD VAlign=top><pre>template <class <A href="AdaptableBinaryFunction.html">AdaptableBinaryFunction</A>, class T>binder1st<<A href="AdaptableBinaryFunction.html">AdaptableBinaryFunction</A>> bind1st(const AdaptableBinaryFunction& F, const T& c);</pre></TD><TD VAlign=top><tt>binder1st</tt></TD><TD VAlign=top>See below</TD></tr></table><h3>New members</h3>These members are not defined in the <A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A>requirements, but are specific to <tt>binder1st</tt>.<Table border><TR><TH>Member</TH><TH>Description</TH></TR><TR><TD VAlign=top><pre>binder1st(const AdaptableBinaryFunction& F, AdaptableBinaryFunction::first_argument_type c)</pre></TD><TD VAlign=top>The constructor. Creates a <tt>binder1st</tt> such that calling it withthe argument <tt>x</tt> (where <tt>x</tt> is of type<tt>AdaptableBinaryFunction::second_argument_type</tt>) corresponds to thecall <tt>F(c, x)</tt>.</TD></TR><TR><TD VAlign=top><pre>template <class <A href="AdaptableBinaryFunction.html">AdaptableBinaryFunction</A>, class T>binder1st<<A href="AdaptableBinaryFunction.html">AdaptableBinaryFunction</A>> bind1st(const AdaptableBinaryFunction& F, const T& c);</pre></TD><TD VAlign=top>If <tt>F</tt> is an object of type <tt>AdaptableBinaryFunction</tt>,then <tt>bind1st(F, c)</tt> is equivalent to <tt>binder1st<AdaptableBinaryFunction>(F, c)</tt>, but is more convenient.The type <tt>T</tt> must be convertible to <tt>AdaptableBinaryFunction::first_argument_type</tt>. This is a globalfunction, not a member function.</TD></tr></table><h3>Notes</h3><P><A name="1">[1]</A>Intuitively, you can think of this operation as "binding" thefirst argument of a binary function to a constant, thus yieldinga unary function. This is a special case of a closure.<h3>See also</h3>The <A href="functors.html">function object overview</A>, <tt><A href="binder2nd.html">binder2nd</A></tt>,<A href="AdaptableUnaryFunction.html">Adaptable Unary Function</A>, <A href="AdaptableBinaryFunction.html">Adaptable Binary Function</A> <!-- start footer --><!-- Footer Begins --><STYLE TYPE="text/css"><!--TD.footer, TD.footer A{ font-family: Arial, helvetica, sans-serif; font-size: 8pt;}A.home {font-family: Arial, helvetica, sans-serif;}--></STYLE><P><A CLASS="home" HREF="index.html">STL Home</A><P><TABLE WIDTH="600" CELLPADDING="0" CELLPADDING="0" BORDER="0"> <TR> <TD ALIGN="RIGHT" CLASS="footer"><A HREF="/company_info/terms.html" TARGET="_top">terms of use</A> | <A HREF="/company_info/privacy.html" TARGET="_top">privacy policy</A></TD> <TD ALIGN="CENTER" CLASS="footer"> | </TD> <TD ALIGN="LEFT" CLASS="footer"><A HREF="/cgi-bin/feedback/" TARGET="_top">contact us</A></TD> </TR><TR> <TD ALIGN="RIGHT" CLASS="footer">Copyright © 1993-2003 Silicon Graphics, Inc. All rights reserved.</TD> <TD ALIGN="CENTER" CLASS="footer"> | </TD> <TD ALIGN="LEFT" CLASS="footer"><A HREF="/company_info/trademarks/" TARGET="_top">Trademark Information</A></TD> </TR></TABLE><!-- Footer Ends --><!-- end footer --><P></BODY></HTML> ⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -