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<title>The File Position</title>
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<td width="21"> <h1></h1></td>
<td width="885"> <font face="Verdana, Arial, Helvetica, sans-serif"><b><font size="6">The
File Position</font></b></font></td>
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<blockquote>
<p><a href="class_reference_filepos.html#introduction">Introduction</a><br>
<a href="class_reference_filepos.html#header_synopsis">Header 'wave/util/file_position.hpp'
synopsis</a><br>
<a href="class_reference_filepos.html#template_parameters">Template parameters</a><br>
<a href="class_reference_filepos.html#member_functions">Member functions</a></p>
</blockquote>
<h2><b><a name="introduction"></a>Introduction</b></h2>
<p>The file position template is used to represent a concrete token position inside
the underlying input stream. This token position contains the corresponding
filename, the line number and the column number, where the token was recognized.</p>
<h2><b><a name="header_synopsis"></a>Header <a href="http://cvs.sourceforge.net/viewcvs.py/boost/boost/boost/wave/util/file_position.hpp?view=markup">wave/util/file_position.hpp</a>
synopsis</b></h2>
<pre><span class="keyword">namespace</span> <span class="identifier">boost</span> {
<span class="keyword">namespace</span> <span class="identifier">wave</span> {
<span class="keyword">namespace</span> <span class="identifier">util</span> {
<span class="keyword">template</span> <<span class="keyword">typename</span> String = <span class="keyword">std::string</span>>
<span class="keyword">class</span> file_position {
<span class="keyword">public</span>:
<a href="class_reference_filepos.html#constructors">file_position</a>();
<span class="keyword">explicit</span> <a href="class_reference_filepos.html#constructors">file_position</a>(String const &file,
int line_ = 1, int column_ = 1);
// accessors
String <span class="keyword">const</span> &<a href="class_reference_filepos.html#get_accessors">get_file</a>() <span class="keyword">const</span>;
<span class="keyword">int</span> <a href="class_reference_filepos.html#get_accessors">get_line</a>() <span class="keyword">const</span>;
<span class="keyword">int</span> <a href="class_reference_filepos.html#get_accessors">get_column</a>() <span class="keyword">const</span>;
<span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_file</a>(String <span class="keyword">const</span> &file);
<span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_line</a>(<span class="keyword">int</span> line);
<span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_column</a>(<span class="keyword">int</span> column);
};
} <span class="comment">// namespace util</span>
} <span class="comment">// namespace wave</span>
} <span class="comment">// namespace boost</span></pre>
<h2><a name="template_parameters"></a>Template parameters</h2>
<p>The <tt>file_position</tt> template used by the default token type has to be instantiated with one template parameter,
which gives the string type to use for storing the file name member of the file
position. If this parameter isn't given, it defaults to a <tt>std::string</tt>.
Please note, that the type given as the template parameter must be compatible
with a <tt>std::string</tt>.</p>
<p>You may use your own position types if appropriate, but in any case these should implement the same interface as the <tt>file_position</tt> template described here. </p>
<h2><a name="member_functions"></a>Member functions</h2>
<h3><a name="constructors"></a>Constructors</h3>
<pre> <a href="class_reference_filepos.html#constructors">file_position</a>();
<span class="keyword">explicit</span> <a href="class_reference_filepos.html#constructors">file_position</a>(String const &file,
int line_ = 1, int column_ = 1);
</pre>
<blockquote>
<p>The constructors initialize a new instance of a <tt>file_position</tt> in
correspondence to the supplied parameters. The parameters default to an empty
filename and the line number and column number set to one.</p>
</blockquote>
<p><a name="get_accessors"></a><b>get_file</b>, <b>get_line</b>, <b>get_column</b></p>
<pre> String <span class="keyword">const</span> &<a href="class_reference_filepos.html#get_accessors">get_file</a>() <span class="keyword">const</span>;
<span class="keyword">int</span> <a href="class_reference_filepos.html#get_accessors">get_line</a>() <span class="keyword">const</span>;
<span class="keyword">int</span> <a href="class_reference_filepos.html#get_accessors">get_column</a>() <span class="keyword">const</span>;
</pre>
<blockquote>
<p>The <tt>get_...</tt> functions are used to access the current values of the
file position members: the filename (<tt>get_file</tt>), the line number (<tt>get_line</tt>)
and the column number (<tt>get_column</tt>).</p>
</blockquote>
<p><a name="set_accessors"></a><b>set_file</b>, <b>set_line</b>, <b>set_column</b></p>
<pre> <span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_file</a>(String <span class="keyword">const</span> &file);
<span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_line</a>(<span class="keyword">int</span> line);
<span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_column</a>(<span class="keyword">int</span> column);
</pre>
<blockquote>
<p>The <tt>set_...</tt> functions are used to set new values to the file position
members: the filename (<tt>set_file</tt>), the line number (<tt>set_line</tt>)
and the column number (<tt>set_column</tt>).</p>
</blockquote>
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<p class="copyright">Copyright © 2003-2005 Hartmut Kaiser<br>
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<font size="2">Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) </font> </p>
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<!-- #BeginDate format:fcAm1m -->Thursday, December 1, 2005 21:25<!-- #EndDate -->
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