1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135
|
<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>remove</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>remove</H1>
<Table CellPadding=0 CellSpacing=0 width=100%>
<TR>
<TD Align=left><Img src = "algorithms.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
<TD Align=right><Img src = "function.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
</TR>
<TR>
<TD Align=left VAlign=top><b>Category</b>: algorithms</TD>
<TD Align=right VAlign=top><b>Component type</b>: function</TD>
</TR>
</Table>
<h3>Prototype</h3>
<pre>
template <class <A href="ForwardIterator.html">ForwardIterator</A>, class T>
ForwardIterator remove(ForwardIterator first, ForwardIterator last,
const T& value);
</pre>
<h3>Description</h3>
<tt>Remove</tt> removes from the range <tt>[first, last)</tt> all elements that
are equal to <tt>value</tt>. That is, <tt>remove</tt> returns an iterator
<tt>new_last</tt> such that the range <tt>[first, new_last)</tt> contains no
elements equal to <tt>value</tt>. <A href="#1">[1]</A> The iterators in the range
<tt>[new_last, last)</tt> are all still dereferenceable, but the elements
that they point to are unspecified. <tt>Remove</tt> is stable, meaning
that the relative order of elements that are not equal to
<tt>value</tt> is unchanged.
<h3>Definition</h3>
Defined in the standard header <A href="algorithm">algorithm</A>, and in the nonstandard
backward-compatibility header <A href="algo.h">algo.h</A>.
<h3>Requirements on types</h3>
<UL>
<LI>
<tt>ForwardIterator</tt> is a model of <A href="ForwardIterator.html">Forward Iterator</A>.
<LI>
<tt>ForwardIterator</tt> is mutable.
<LI>
<tt>T</tt> is a model of <A href="EqualityComparable.html">Equality Comparable</A>.
<LI>
Objects of type <tt>T</tt> can be compared for equality with objects
of <tt>ForwardIterator</tt>'s value type.
</UL>
<h3>Preconditions</h3>
<UL>
<LI>
<tt>[first, last)</tt> is a valid range.
</UL>
<h3>Complexity</h3>
Linear. <tt>Remove</tt> performs exactly <tt>last - first</tt> comparisons for equality.
<h3>Example</h3>
<pre>
<A href="Vector.html">vector</A><int> V;
V.push_back(3);
V.push_back(1);
V.push_back(4);
V.push_back(1);
V.push_back(5);
V.push_back(9);
<A href="copy.html">copy</A>(V.begin(), V.end(), <A href="ostream_iterator.html">ostream_iterator</A><int>(cout, " "));
// The output is "3 1 4 1 5 9".
vector<int>::iterator new_end = remove(V.begin(), V.end(), 1);
<A href="copy.html">copy</A>(V.begin(), new_end, <A href="ostream_iterator.html">ostream_iterator</A><int>(cout, " "));
// The output is "3 4 5 9".
</pre>
<h3>Notes</h3>
<P><A name="1">[1]</A>
The meaning of "removal" is somewhat subtle. <tt>Remove</tt>
does not destroy any iterators, and does not change the distance
between <tt>first</tt> and <tt>last</tt>. (There's no way that it could do anything
of the sort.) So, for example, if <tt>V</tt> is a <A href="Vector.html">vector</A>,
<tt>remove(V.begin(), V.end(), 0)</tt> does not change <tt>V.size()</tt>: <tt>V</tt> will
contain just as many elements as it did before. <tt>Remove</tt> returns an
iterator that points to the end of the resulting range after elements
have been removed from it; it follows that the elements after that
iterator are of no interest, and may be discarded. If you are
removing elements from a <A href="Sequence.html">Sequence</A>, you may simply erase them.
That is, a reasonable way of removing elements from a <A href="Sequence.html">Sequence</A>
is <tt>S.erase(remove(S.begin(), S.end(), x), S.end())</tt>.
<h3>See also</h3>
<tt><A href="remove_if.html">remove_if</A></tt>, <tt><A href="remove_copy.html">remove_copy</A></tt>, <tt><A href="remove_copy_if.html">remove_copy_if</A></tt>,
<tt><A href="unique.html">unique</A></tt>, <tt><A href="unique_copy.html">unique_copy</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>
|