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4<title>The File Position</title>
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12 <td width="21"> <h1></h1></td>
13 <td width="885"> <font face="Verdana, Arial, Helvetica, sans-serif"><b><font size="6">The
14 File Position</font></b></font></td>
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27<blockquote>
28 <p><a href="class_reference_filepos.html#introduction">Introduction</a><br>
29 <a href="class_reference_filepos.html#header_synopsis">Header 'wave/util/file_position.hpp'
30 synopsis</a><br>
31 <a href="class_reference_filepos.html#template_parameters">Template parameters</a><br>
32 <a href="class_reference_filepos.html#member_functions">Member functions</a></p>
33</blockquote>
34<h2><b><a name="introduction"></a>Introduction</b></h2>
35<p>The file position template is used to represent a concrete token position inside
36 the underlying input stream. This token position contains the corresponding
37 filename, the line number and the column number, where the token was recognized.</p>
38<h2><b><a name="header_synopsis"></a>Header <a href="http://svn.boost.org/trac/boost/browser/trunk/boost/wave/util/file_position.hpp">wave/util/file_position.hpp</a>
39 synopsis</b></h2>
40<pre><span class="keyword">namespace</span> <span class="identifier">boost</span> {
41<span class="keyword">namespace</span> <span class="identifier">wave</span> {
42<span class="keyword">namespace</span> <span class="identifier">util</span> {
43
44 <span class="keyword">template</span> &lt;<span class="keyword">typename</span> String = <span class="keyword">std::string</span>&gt;
45 <span class="keyword">class</span> file_position {
46
47 <span class="keyword">public</span>:
48 <a href="class_reference_filepos.html#constructors">file_position</a>();
49 <span class="keyword">explicit</span> <a href="class_reference_filepos.html#constructors">file_position</a>(String const &amp;file,
50 <span class="keyword">unsigned int</span> line_ = 1, <span class="keyword">unsigned int </span>column_ = 1);
51
52 // accessors
53 String <span class="keyword">const</span> &amp;<a href="class_reference_filepos.html#get_accessors">get_file</a>() <span class="keyword">const</span>;
54 <span class="keyword">unsigned int</span> <a href="class_reference_filepos.html#get_accessors">get_line</a>() <span class="keyword">const</span>;
55 <span class="keyword">unsigned int</span> <a href="class_reference_filepos.html#get_accessors">get_column</a>() <span class="keyword">const</span>;
56
57 <span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_file</a>(String <span class="keyword">const</span> &amp;file);
58 <span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_line</a>(<span class="keyword">int</span> line);
59 <span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_column</a>(<span class="keyword">int</span> column);
60 };
61
62} <span class="comment">// namespace util</span>
63} <span class="comment">// namespace wave</span>
64} <span class="comment">// namespace boost</span></pre>
65<h2><a name="template_parameters"></a>Template parameters</h2>
66<p>The <tt>file_position</tt> template used by the default token type has to be instantiated with one template parameter,
67 which gives the string type to use for storing the file name member of the file
68 position. If this parameter isn't given, it defaults to a <tt>std::string</tt>.
69 Please note, that the type given as the template parameter must be compatible
70 with 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>
71<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>
72<h2><a name="member_functions"></a>Member functions</h2>
73<h3><a name="constructors"></a>Constructors</h3>
74<pre> <a href="class_reference_filepos.html#constructors">file_position</a>();
75 <span class="keyword">explicit</span> <a href="class_reference_filepos.html#constructors">file_position</a>(String const &amp;file,
76 <span class="keyword">unsigned int </span>line_ = 1, <span class="keyword">unsigned int </span>column_ = 1);
77</pre>
78<blockquote>
79 <p>The constructors initialize a new instance of a <tt>file_position</tt> in
80 correspondence to the supplied parameters. The parameters default to an empty
81 filename and the line number and column number set to one.</p>
82</blockquote>
83<p><a name="get_accessors"></a><b>get_file</b>, <b>get_line</b>, <b>get_column</b></p>
84<pre> String <span class="keyword">const</span> &amp;<a href="class_reference_filepos.html#get_accessors">get_file</a>() <span class="keyword">const</span>;
85 <span class="keyword">unsigned int</span> <a href="class_reference_filepos.html#get_accessors">get_line</a>() <span class="keyword">const</span>;
86 <span class="keyword">unsigned int</span> <a href="class_reference_filepos.html#get_accessors">get_column</a>() <span class="keyword">const</span>;
87</pre>
88<blockquote>
89 <p>The <tt>get_...</tt> functions are used to access the current values of the
90 file position members: the filename (<tt>get_file</tt>), the line number (<tt>get_line</tt>)
91 and the column number (<tt>get_column</tt>).</p>
92</blockquote>
93<p><a name="set_accessors"></a><b>set_file</b>, <b>set_line</b>, <b>set_column</b></p>
94<pre> <span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_file</a>(String <span class="keyword">const</span> &amp;file);
95 <span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_line</a>(<span class="keyword">unsigned int</span> line);
96 <span class="keyword">void</span> <a href="class_reference_filepos.html#set_accessors">set_column</a>(<span class="keyword">unsigned int</span> column);
97</pre>
98<blockquote>
99 <p>The <tt>set_...</tt> functions are used to set new values to the file position
100 members: the filename (<tt>set_file</tt>), the line number (<tt>set_line</tt>)
101 and the column number (<tt>set_column</tt>).</p>
102</blockquote>
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112<p class="copyright">Copyright &copy; 2003-2011 Hartmut Kaiser<br>
113 <br>
114<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>
115<p class="copyright"><span class="updated">Last updated:
116 <!-- #BeginDate format:fcAm1m -->Saturday, September 18, 2010 15:14<!-- #EndDate -->
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