asskoala/CKG
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

first commit

Browse Source
This commit is contained in:
Jose Caban
2025-06-07 11:34:38 -04:00
commit 0eb2d7c07d
4708 changed files with 1500614 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
extern/stdcxx/4.2.1/doc/stdlibug/22-2.html vendored Normal file
View File

@@ -0,0 +1,67 @@
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed
with this work for additional information regarding copyright
ownership. The ASF licenses this file to you under the Apache
License, Version 2.0 (the License); you may not use this file
except in compliance with the License. You may obtain a copy of
the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied. See the License for the specific language governing
permissions and limitations under the License.
Copyright 1999-2007 Rogue Wave Software, Inc.
-->
<HTML>
<HEAD>
<TITLE>Declaring a valarray</TITLE>
<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
<BODY BGCOLOR=#FFFFFF>
<A HREF="22-1.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="22-3.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library User's Guide</B></DIV>
<H2>22.2 Declaring a valarray</H2>
<A NAME="idx460"><!></A>
<P>A <B><I><A HREF="../stdlibref/valarray.html">valarray</A></I></B> can be constructed by any of the following means:</P>
<UL>
<LI><P CLASS="LIST"><B>Default constructor</B>. The default constructor is provided to allow arrays of <B><I><A HREF="../stdlibref/valarray.html">valarray</A></I></B>s. Use the resize function to adjust the <B><I>valarray</I></B> after construction.</P></LI>
<LI><P CLASS="LIST"><B>Construction and initialization.</B> A <B><I><A HREF="../stdlibref/valarray.html">valarray</A></I></B> provides two ways to start with a given size and values: </P></LI>
<UL>
<LI><P CLASS="LIST"><SAMP>valarray(const T&amp; v,size_t n)</SAMP> constructs a <B><I><A HREF="../stdlibref/valarray.html">valarray</A></I></B> of size <SAMP>n</SAMP> with each element initialized to the value <SAMP>v</SAMP>. </P></LI>
<LI><P CLASS="LIST"><SAMP>valarray(const T* p,size_t n)</SAMP> constructs a <B><I><A HREF="../stdlibref/valarray.html">valarray</A></I></B> of size <SAMP>n</SAMP> with each element initialized to the corresponding element of the array pointed to by <SAMP>p</SAMP>. This constructor allows a program to transfer data with maximum efficiency from an ordinary `C' array (resulting from a file operation, for example) into a <B><I>valarray</I></B>.</P></LI>
</UL>
<LI><P CLASS="LIST"><B>Copy constructor</B>. The copy constructor has value semantics.</P></LI>
<LI><P CLASS="LIST"><B>Conversion constructors</B>. Class <B><I><A HREF="../stdlibref/valarray.html">valarray</A></I></B> provides four conversion constructors for converting from auxiliary classes generated by subscript operations. We'll look at these classes in detail and describe the use of the conversion constructors in <A HREF="22-4.html#2242">Section&nbsp;22.4.2</A>.</P></LI>
</UL>
<P>The following example shows the use of the first three categories of constructors:</P>
<UL><PRE>
#include &lt;valarray&gt;
std::valarray&lt;int&gt; v1; // construct an empty valarray
std::valarray&lt;int&gt; v2(1,3); // construct a valarray of three
// elements, all initialized to 1
v1.resize(3,2); // resize the first valarray to three
// elements, all initialized to 2
std::valarray&lt;int&gt; v3(v1); // v3 gets a copy of v1's elements.
</PRE></UL>
<BR>
<HR>
<A HREF="22-1.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="22-3.html"><IMG SRC="images/bnext.gif" WIDTH=20 HEIGHT=21 ALT="Next file" BORDER=O></A>
<!-- Google Analytics tracking code -->
<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
</script>
<script type="text/javascript">
_uacct = "UA-1775151-1";
urchinTracker();
</script>
<!-- end of Google Analytics tracking code -->
</BODY>
</HTML>