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bad_expression.html

bad_expression.html 9.6 KB
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  25. <div class="section">
    26. 

  26. <div class="titlepage"><div><div><h3 class="title">
    27. 

  27. <a name="boost_regex.ref.bad_expression"></a><a class="link" href="bad_expression.html" title="bad_expression">bad_expression</a>
    28. 

  28. </h3></div></div></div>
    29. 

  29. <h5>
    30. 

  30. <a name="boost_regex.ref.bad_expression.h0"></a>
    31. 

  31.         <span class="phrase"><a name="boost_regex.ref.bad_expression.synopsis"></a></span><a class="link" href="bad_expression.html#boost_regex.ref.bad_expression.synopsis">Synopsis</a>
    32. 

  32.       </h5>
    33. 

  33. <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">pattern_except</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
    34. 

  34. </pre>
    35. 

  35. <p>
    36. 

  36.         The class <code class="computeroutput"><span class="identifier">regex_error</span></code> defines
    37. 

  37.         the type of objects thrown as exceptions to report errors during the conversion
    38. 

  38.         from a string representing a regular expression to a finite state machine.
    39. 

  39.       </p>
    40. 

  40. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span>
    41. 

  41. 

  42. <span class="keyword">class</span> <span class="identifier">regex_error</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span>
    43. 

  43. <span class="special">{</span>
    44. 

  44. <span class="keyword">public</span><span class="special">:</span>
    45. 

  45.    <span class="keyword">explicit</span> <span class="identifier">regex_error</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">pos</span><span class="special">);</span>
    46. 

  46.    <span class="keyword">explicit</span> <span class="identifier">regex_error</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">err</span><span class="special">);</span>
    47. 

  47.    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">code</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
    48. 

  48.    <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">position</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
    49. 

  49. <span class="special">};</span>
    50. 

  50. 

  51. <span class="keyword">typedef</span> <span class="identifier">regex_error</span> <span class="identifier">bad_pattern</span><span class="special">;</span> <span class="comment">// for backwards compatibility</span>
    52. 

  52. <span class="keyword">typedef</span> <span class="identifier">regex_error</span> <span class="identifier">bad_expression</span><span class="special">;</span> <span class="comment">// for backwards compatibility</span>
    53. 

  53. 

  54. <span class="special">}</span> <span class="comment">// namespace boost</span>
    55. 

  55. </pre>
    56. 

  56. <h5>
    57. 

  57. <a name="boost_regex.ref.bad_expression.h1"></a>
    58. 

  58.         <span class="phrase"><a name="boost_regex.ref.bad_expression.description"></a></span><a class="link" href="bad_expression.html#boost_regex.ref.bad_expression.description">Description</a>
    59. 

  59.       </h5>
    60. 

  60. <pre class="programlisting"><span class="identifier">regex_error</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">err</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">pos</span><span class="special">);</span>
    61. 

  61. <span class="identifier">regex_error</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">err</span><span class="special">);</span>
    62. 

  62. </pre>
    63. 

  63. <p>
    64. 

  64.         <span class="bold"><strong>Effects:</strong></span> Constructs an object of class regex_error.
    65. 

  65.       </p>
    66. 

  66. <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">error_type</span> <span class="identifier">code</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
    67. 

  67. </pre>
    68. 

  68. <p>
    69. 

  69.         <span class="bold"><strong>Effects:</strong></span> returns the error code that represents
    70. 

  70.         parsing error that occurred.
    71. 

  71.       </p>
    72. 

  72. <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">position</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
    73. 

  73. </pre>
    74. 

  74. <p>
    75. 

  75.         <span class="bold"><strong>Effects:</strong></span> returns the location in the expression
    76. 

  76.         where parsing stopped.
    77. 

  77.       </p>
    78. 

  78. <p>
    79. 

  79.         Footnotes: the choice of <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code>
    80. 

  80.         as the base class for <code class="computeroutput"><span class="identifier">regex_error</span></code>
    81. 

  81.         is moot; depending upon how the library is used exceptions may be either
    82. 

  82.         logic errors (programmer supplied expressions) or run time errors (user supplied
    83. 

  83.         expressions). The library previously used <code class="computeroutput"><span class="identifier">bad_pattern</span></code>
    84. 

  84.         and <code class="computeroutput"><span class="identifier">bad_expression</span></code> for errors,
    85. 

  85.         these have been replaced by the single class <code class="computeroutput"><span class="identifier">regex_error</span></code>
    86. 

  86.         to keep the library in synchronization with the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Technical
    87. 

  87.         Report on C++ Library Extensions</a>.
    88. 

  88.       </p>
    89. 

  89. </div>
    90. 

  90. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    91. 

  91. <td align="left"></td>
    92. 

  92. <td align="right"><div class="copyright-footer">Copyright &#169; 1998-2013 John Maddock<p>
    93. 

  93.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    94. 

  94.         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
    95. 

  95.       </p>
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