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extern/stdcxx/4.2.1/doc/stdlibref/indirect-array.html
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extern/stdcxx/4.2.1/doc/stdlibref/indirect-array.html
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<HTML>
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<HEAD>
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<TITLE>indirect_array</TITLE>
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<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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<BODY BGCOLOR=#FFFFFF>
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<A HREF="includes.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="inner-product.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library Reference Guide</B></DIV>
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<H2>indirect_array</H2>
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<P><B>Library:</B> <A HREF="2-10.html">Numerics</A></P>
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<PRE><HR><B><I>Does not inherit</I></B><HR></PRE>
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<UL>
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<LI><A HREF="#sec1">Local Index</A></LI>
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<LI><A HREF="#sec2">Summary</A></LI>
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<LI><A HREF="#sec3">Synopsis</A></LI>
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<LI><A HREF="#sec4">Description</A></LI>
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<LI><A HREF="#sec5">Interface</A></LI>
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<LI><A HREF="#sec6">Constructors</A></LI>
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<LI><A HREF="#sec7">Assignment Operators</A></LI>
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<LI><A HREF="#sec8">Computed Assignment Operators</A></LI>
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<LI><A HREF="#sec9">Example</A></LI>
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<LI><A HREF="#sec10">See Also</A></LI>
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<LI><A HREF="#sec11">Standards Conformance</A></LI>
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</UL>
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<A NAME="sec1"><H3>Local Index</H3></A>
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<H4>Members</H4>
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<UL><TABLE CELLPADDING=3>
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<TR><TD VALIGN=top>
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<A HREF="#idx658">indirect_array()</A><BR>
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<A HREF="#idx662">operator%=()</A><BR>
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<A HREF="#idx662">operator&=()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx662">operator>>=()</A><BR>
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<A HREF="#idx662">operator<<=()</A><BR>
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<A HREF="#idx662">operator*=()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx662">operator+=()</A><BR>
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<A HREF="#idx662">operator-=()</A><BR>
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<A HREF="#idx662">operator/=()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx659">operator=()</A><BR>
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<A HREF="#idx662">operator^=()</A><BR>
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<A HREF="#idx662">operator|=()</A><BR>
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</TD></TR>
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</TABLE></UL>
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<A NAME="sec2"><H3>Summary</H3></A>
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<P>A numeric array class used to represent elements selected from a <B><I><A HREF="valarray.html">valarray</A></I></B></P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <valarray>
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namespace std {
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template <class T>
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class indirect_array;
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}
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</PRE>
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<A NAME="sec4"><H3>Description</H3></A>
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<P><B><I>indirect_array</I></B> creates a selective view into a <B><I><A HREF="valarray.html">valarray</A></I></B>. An <B><I>indirect_array</I></B> is produced by applying the indirect subscript operator to a <B><I>valarray</I></B>. The indirect array produced by this subscript contains only the elements of the <B><I>valarray</I></B> whose indices appear as values in the argument. The elements in an <B><I>indirect_array</I></B> are references to selected elements in the <B><I>valarray</I></B>. For this reason, changing an element in the <B><I>indirect_array</I></B> really changes the corresponding element in the <B><I>valarray</I></B>. An <B><I>indirect_array</I></B> does not itself hold any distinct elements. The template cannot be instantiated directly since all its constructors are private. However, you can copy an <B><I>indirect_array</I></B> to a <B><I>valarray</I></B> using either the <B><I>valarray</I></B> copy constructor or the assignment operator. Reference semantics are lost at that point. </P>
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<A NAME="sec5"><H3>Interface</H3></A>
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<UL><PRE>namespace std{
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template <class T> class indirect_array {
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public:
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// types
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typedef T value_type;
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// destructor
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~indirect_array();
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// public assignment
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void operator=(const valarray<T>& array) const;
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// computed assignment
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void operator*=(const valarray<T>& array) const;
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void operator/=(const valarray<T>& array) const;
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void operator%=(const valarray<T>& array) const;
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void operator+=(const valarray<T>& array) const;
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void operator-=(const valarray<T>& array) const;
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void operator^=(const valarray<T>& array) const;
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void operator&=(const valarray<T>& array) const;
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void operator|=(const valarray<T>& array) const;
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void operator<<=(const valarray<T>& array) const;
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void operator>>=(const valarray<T>& array) const;
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// fill function
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void operator=(const T&);
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private:
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// constructors
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indirect_array();
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indirect_array(const indirect_array<T>&);
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// operator =
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indirect_array<T>&
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operator=(const indirect_array<T>& array);
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};
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}
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</PRE></UL>
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<A NAME="sec6"><H3>Constructors</H3></A>
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<A NAME="idx658"></A><PRE><B>indirect_array</B>();
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<B>indirect_array</B>(const indirect_array&);</PRE>
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<UL>
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<P>All <B><I>indirect_array</I></B> constructors are private and cannot be called directly. This prevents copy construction of <B><I>indirect_arrays</I></B>.</P>
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</UL>
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<A NAME="sec7"><H3>Assignment Operators</H3></A>
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<A NAME="idx659"></A><PRE>void <B>operator=</B>(const valarray<T>& x) const;</PRE>
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<UL>
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<P>Assigns values from <SAMP>x </SAMP>to the selected elements of the <B><I><A HREF="valarray.html">valarray</A></I></B> that self refers to. Remember that an <B><I>indirect_array</I></B> never holds any elements itself; it simply refers to selected elements in the <B><I>valarray</I></B> used to generate it.</P>
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</UL>
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<A NAME="idx660"></A><PRE>indirect_array<T>&
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<B>operator=</B>(const indirect-_array<T>& x);</PRE>
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<UL>
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<P>Private assignment operator. Cannot be called directly, thus preventing assignment between <B><I>indirect_arrays</I></B>.</P>
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</UL>
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<A NAME="idx661"></A><PRE>void <B>operator=</B>(const T& x);</PRE>
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<UL>
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<P>Assigns <SAMP>x</SAMP> to the selected elements of the <B><I><A HREF="valarray.html">valarray</A></I></B> that self refers to. </P>
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</UL>
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<A NAME="sec8"><H3>Computed Assignment Operators</H3></A>
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<A NAME="idx662"></A><PRE>void <B>operator*=</B>(const valarray<T>& val) const;
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void <B>operator/=</B>(const valarray<T>& val) const;
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void <B>operator%=</B>(const valarray<T>& val) const;
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void <B>operator+=</B>(const valarray<T>& val) const;
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void <B>operator-=</B>(const valarray<T>& val) const;
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void <B>operator^=</B>(const valarray<T>& val) const;
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void <B>operator&=</B>(const valarray<T>& val) const;
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void <B>operator|=</B>(const valarray<T>& val) const;
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void <B>operator<<=</B>(const valarray<T>& val) const;
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void <B>operator>>=</B>(const valarray<T>& val) const;</PRE>
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<UL>
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<P>Applies the indicated operation using elements from <SAMP>val</SAMP> to the selected elements of the <B><I><A HREF="valarray.html">valarray</A></I></B> that self refers to. Remember that an <B><I>indirect_array</I></B> never holds any elements itself; it simply refers to selected elements in the <B><I>valarray</I></B> used to generate it.</P>
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</UL>
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<A NAME="sec9"><H3>Example</H3></A>
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<UL><PRE>//
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// indirect_array.cpp
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//
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#include <valarray.h> // Includes valarray and
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// provides stream inserter.
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typedef std::valarray<int> valarray_t;
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typedef std::valarray<size_t> selector_t;
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int main(void) {
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// Create a valarray of integers.
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valarray_t::value_type vbuf[10] = {0,1,2,3,4,5,6,7,8,9};
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valarray_t vi(vbuf, (sizeof vbuf / sizeof *vbuf));
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// Create a valarray of indices for a selector.
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selector_t::value_type sbuf[6] = {0,2,3,4,7,8};
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selector_t selector(sbuf, (sizeof sbuf / sizeof *sbuf));
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// Print out the valarray<int>.
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std::cout << "original valarray vi\n\n" << vi << "\n\n";
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// Print out the selective array.
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std::cout << "vi[0,2,3,4,7,8]\n\n" << vi[selector] << "\n\n";
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// Double the selected values.
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vi[selector] += vi[selector];
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// Print out the modified valarray.
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std::cout << "vi[0,2,3,4,7,8] += vi[0,2,3,4,7,8]\n\n" << vi
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<< std::endl;
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return 0;
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}
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Program Output:
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</PRE></UL>
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<UL><PRE>original valarray vi
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[0,1,2,3,4,5,6,7,8,9]
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vi[0,2,3,4,7,8]
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[0,2,3,4,7,8]
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vi[0,2,3,4,7,8] += vi[0,2,3,4,7,8]
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[0,1,4,6,8,5,6,14,16,9]
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</PRE></UL>
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<A NAME="sec10"><H3>See Also</H3></A>
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<P><B><I><A HREF="slice.html">slice</A></I></B>, <B><I><A HREF="slice-array.html">slice_array</A></I></B>, <B><I><A HREF="valarray.html">valarray</A></I></B>, <B><I><A HREF="gslice.html">gslice</A></I></B>, <B><I><A HREF="gslice-array.html">gslice_array</A></I></B>, <B><I><A HREF="mask-array.html">mask_array</A></I></B></P>
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<A NAME="sec11"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 26.3.9</I></P>
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<BR>
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