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| <H1 CLASS="title">Function Template <CODE>read</CODE></H1> |
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| <DL class="page-index"> |
| <DT><A href="#overview">Overview</A></DT> |
| <DT><A href="#example">Example</A></DT> |
| <DT><A href="#headers">Headers</A></DT> |
| <DT><A href="#reference">Reference</A></DT> |
| </DL> |
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| <A NAME="overview"></A> |
| <H2>Overview</H2> |
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| <P> |
| The two overloads of the function template <CODE>read</CODE> provide a uniform interface for reading a sequence of characters from a <A HREF="../concepts/source.html">Source</A> or <A HREF="../concepts/input_filter.html">InputFilter</A>. |
| <UL> |
| <LI>The first overload can be used directly in the definitions of new Filter types (<I>see</I> <A HREF="#example">Example</A>), and figures in the specification of the <A HREF="../guide/concepts.html#device_concepts">Device</A> concepts. |
| <LI>The second overload is primarily for internal use by the library. |
| </UL> |
| </P> |
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| <A NAME="example"></A> |
| <H2>Example</H2> |
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| <P> |
| The following code illustrates the use of the function <CODE>read</CODE> in the definition of a <A HREF="../concepts/multi_character.html">Multi-Character</A> <A HREF="../concepts/input_filter.html">InputFilter</A>. |
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| <PRE CLASS="broken_ie"> <SPAN CLASS="preprocessor">#include</SPAN> <SPAN CLASS="literal"><ctype.h></SPAN> <SPAN CLASS="comment">// tolower</SPAN> |
| <SPAN CLASS="preprocessor">#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/concepts.hpp"><SPAN CLASS="literal"><boost/iostreams/concepts.hpp></SPAN></A> <SPAN CLASS="comment">// multichar_input_filter</SPAN> |
| <SPAN CLASS="preprocessor">#include</SPAN> <A CLASS="header" HREF="../../../../boost/iostreams/operations.hpp"><SPAN CLASS="literal"><boost/iostreams/operations.hpp></SPAN></A> <SPAN CLASS="comment">// read</SPAN> |
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| <SPAN CLASS="keyword">using</SPAN> <SPAN CLASS="keyword">namespace</SPAN> std; |
| <SPAN CLASS="keyword">namespace</SPAN> io = boost::iostreams; |
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| <SPAN CLASS="keyword">struct</SPAN> tolower_filter : <SPAN CLASS="keyword">public</SPAN> io::multichar_input_filter { |
| <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> Source> |
| streamsize read(Source& src, <SPAN CLASS="keyword">char</SPAN>* s, streamsize n) |
| { |
| streamsize result; |
| <SPAN CLASS="keyword">if</SPAN> ((result = io::read(src, s, n)) == <SPAN CLASS='numeric_literal'>-1</SPAN>) |
| <SPAN CLASS="keyword">return</SPAN> <SPAN CLASS='numeric_literal'>-1</SPAN>; <SPAN CLASS='comment'>// EOF</SPAN> |
| <SPAN CLASS="keyword">for</SPAN> (streamsize z = <SPAN CLASS="numeric_literal">0</SPAN>; z < result; ++z) |
| s[z] = tolower((<SPAN CLASS="keyword">unsigned</SPAN> <SPAN CLASS="keyword">char</SPAN>) s[z]); |
| <SPAN CLASS="keyword">return</SPAN> result; |
| } |
| };</PRE> |
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| <A NAME="headers"></A> |
| <H2>Headers</H2> |
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| <DL> |
| <DT><A CLASS="header" HREF="../../../../boost/iostreams/operations.hpp"><CODE><boost/iostreams/operations.hpp></CODE></A></DT> |
| <DT><A CLASS="header" HREF="../../../../boost/iostreams/read.hpp"><CODE><boost/iostreams/read.hpp></CODE></A></DT> |
| </DL> |
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| <A NAME="reference"></A> |
| <H2>Reference</H2> |
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| <A NAME="description"></A> |
| <H4>Description</H4> |
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| <P> |
| Reads a sequence of characters from a given instance of the template parameter <CODE>T</CODE>, returning the number of characters read, or <CODE>-1</CODE> to indicate end-of-sequence. |
| </P> |
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| <A NAME="synopsis"></A> |
| <H4>Synopsis</H4> |
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| <PRE CLASS="broken_ie"><SPAN CLASS="keyword">namespace</SPAN> boost { <SPAN CLASS="keyword">namespace</SPAN> iostreams { |
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| <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#template_params">T</A>> |
| std::streamsize <A CLASS="documented" HREF="#read_device">read</A>( T& <A CLASS="documented" HREF="#function_params">t</A>, |
| <SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="../guide/traits.html#char_type_of_ref">char_type_of</A><T>::type* <A CLASS="documented" HREF="#function_params">s</A>, |
| std::streamsize <A CLASS="documented" HREF="#function_params">n</A> ); |
| |
| <SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#template_params">T</A>, <SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="#template_params">Source</A>> |
| std::streamsize <A CLASS="documented" HREF="#read_filter">read</A>( T& <A CLASS="documented" HREF="#function_params">t</A>, |
| Source& <A CLASS="documented" HREF="#function_params">src</A>, |
| <SPAN CLASS="keyword">typename</SPAN> <A CLASS="documented" HREF="../guide/traits.html#char_type_of_ref">char_type_of</A><T>::type* <A CLASS="documented" HREF="#function_params">s</A>, |
| std::streamsize <A CLASS="documented" HREF="#function_params">n</A> ); |
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| } } <SPAN CLASS="comment">// End namespace boost::io</SPAN></PRE> |
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| <A NAME="template_params"></A> |
| <H4>Template Parameters</H4> |
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| <TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2> |
| <TR> |
| <TR> |
| <TD VALIGN="top"><I>T</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> |
| <TD>For the first overload, a model of <A HREF="../concepts/source.html">Source</A> or a standard input stream or stream buffer type. For the second overload, a model of <A HREF="../concepts/input_filter.html">InputFilter</A>. |
| </TR> |
| <TR> |
| <TD VALIGN="top"><I>Source</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> |
| <TD>An <A HREF="../concepts/direct.html">indirect</A> model of <A HREF="../concepts/source.html">Source</A> with the same <A HREF="../guide/traits.html#char_type">character type</A> as <CODE>T</CODE> whose <A HREF="../guide/modes.html">mode</A> refines that of <CODE>T</CODE>. <CODE>Source</CODE> must also model <A HREF="../concepts/peekable.html">Peekable</A>. |
| </TR> |
| </TABLE> |
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| <A NAME="function_params"></A> |
| <H4>Function Parameters</H4> |
| |
| <TABLE STYLE="margin-left:2em" BORDER=0 CELLPADDING=2> |
| <TR> |
| <TR> |
| <TD VALIGN="top"><I>t</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> |
| <TD>An instance of the Filter or Device type <CODE>T</CODE></TD> |
| </TR> |
| <TR> |
| <TD VALIGN="top"><I>s</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> |
| <TD>The buffer into which characters should be read</TD> |
| </TR> |
| <TR> |
| <TD VALIGN="top"><I>n</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> |
| <TD>The maximum number of characters to read</TD> |
| </TR> |
| <TR> |
| <TD VALIGN="top"><I>src</I></TD><TD WIDTH="2em" VALIGN="top">-</TD> |
| <TD>An instance of <CODE>Source</CODE> |
| </TR> |
| </TABLE> |
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| <A NAME="read_device"></A> |
| <H4>Semantics — Device Types</H4> |
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| <PRE CLASS="broken_ie"><SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> T> |
| std::streamsize read( T& t, |
| <SPAN CLASS="keyword">typename</SPAN> char_type_of<T>::type* s, |
| std::streamsize n );</PRE> |
| |
| <P>The semantics of <CODE>read</CODE> depends on the <A HREF="../guide/traits.html#category">category</A> of <CODE>T</CODE> as follows:</P> |
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| <TABLE STYLE="margin-left:2em" BORDER=1 CELLPADDING=4> |
| <TR><TH><CODE>category_of<T>::type</CODE></TH><TH>semantics</TH></TR> |
| <TR> |
| <TD VALIGN="top">convertible to <A HREF="../guide/traits.html#category_tags"><CODE>istream_tag</CODE></A></TD> |
| <TD>invokes <CODE>t.read(s, n)</CODE> and returns <CODE>t.gcount()</CODE></TD> |
| </TR> |
| <TR> |
| <TD VALIGN="top">convertible to <A HREF="../guide/traits.html#category_tags"><CODE>streambuf_tag</CODE></A> but not to <A HREF="../guide/traits.html#category_tags"><CODE>istream_tag</CODE></A></TD> |
| <TD>returns <CODE>t.sgetn(s, n)</CODE></TD> |
| </TR> |
| <TR> |
| <TD VALIGN="top"><I>not</I> convertible to <A HREF="../guide/traits.html#category_tags"><CODE>direct_tag</CODE></A></TD> |
| <TD>returns <CODE>t.read(s, n)</CODE></TD> |
| </TR> |
| <TR> |
| <TD VALIGN="top">otherwise</TD> |
| <TD>compile-time error</CODE></TD> |
| </TR> |
| </TABLE> |
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| <A NAME="read_filter"></A> |
| <H4>Semantics — Filter Types</H4> |
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| <PRE CLASS="broken_ie"><SPAN CLASS="keyword">template</SPAN><<SPAN CLASS="keyword">typename</SPAN> T> |
| std::streamsize read( T& t, |
| Source& src, |
| <SPAN CLASS="keyword">typename</SPAN> char_type_of<T>::type* s, |
| std::streamsize n );</PRE> |
| |
| <P>The semantics of <CODE>read</CODE> depends on the <A HREF="../guide/traits.html#category">category</A> of <CODE>T</CODE> as follows:</P> |
| |
| <TABLE STYLE="margin-bottom:2em;margin-left:2em" BORDER=1 CELLPADDING=4> |
| <TR><TH><CODE>category_of<T>::type</CODE></TH><TH>semantics</TH></TR> |
| <TR> |
| <TD VALIGN="top">convertible to <A HREF="../guide/traits.html#category_tags"><CODE>multichar_tag</CODE></A></TD> |
| <TD>returns <CODE>t.read(src, s, n)</CODE></TD> |
| </TR> |
| <TR> |
| <TD VALIGN="top">otherwise</TD> |
| <TD> |
| reads up to <CODE>n</CODE> characters into <CODE>s</CODE> by invoking <CODE>t.get(src)</CODE> repeatedly, halting if <CODE>traits_typre::eof</CODE> or <A HREF="../classes/char_traits.html#would_block"><CODE>traits_type::would_block</CODE></A> is returned, where <CODE>traits_type</CODE> is <A HREF="../classes/char_traits.html"><CODE>boost::iostreams::char_traits<Source></CODE></A></A>. Returns the number of characters read, or <CODE>-1</CODE> to indicate end-of-sequence. |
| </TD> |
| </TR> |
| </TABLE> |
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| <P CLASS="copyright">Revised 02 Feb 2008</P> |
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| <P CLASS="copyright">© Copyright 2008 <a href="http://www.coderage.com/" target="_top">CodeRage, LLC</a><br/>© Copyright 2004-2007 <a href="http://www.coderage.com/turkanis/" target="_top">Jonathan Turkanis</a></P> |
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| Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <A HREF="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>) |
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