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number_list_redux___list_syntax.html

number_list_redux___list_syntax.html 7.7 KB
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  4. <title>Number List Redux - list syntax</title>
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  25. <div class="section">
    26. 

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

  27. <a name="spirit_x3.tutorials.number_list_redux___list_syntax"></a><a class="link" href="number_list_redux___list_syntax.html" title="Number List Redux - list syntax">Number
    28. 

  28.       List Redux - list syntax</a>
    29. 

  29. </h3></div></div></div>
    30. 

  30. <p>
    31. 

  31.         So far, we've been using the syntax:
    32. 

  32.       </p>
    33. 

  33. <pre class="programlisting"><span class="identifier">double_</span> <span class="special">&gt;&gt;</span> <span class="special">*(</span><span class="char">','</span> <span class="special">&gt;&gt;</span> <span class="identifier">double_</span><span class="special">)</span>
    34. 

  34. </pre>
    35. 

  35. <p>
    36. 

  36.         to parse a comma-delimited list of numbers. Such lists are common in parsing
    37. 

  37.         and Spirit provides a simpler shortcut for them. The expression above can
    38. 

  38.         be simplified to:
    39. 

  39.       </p>
    40. 

  40. <pre class="programlisting"><span class="identifier">double_</span> <span class="special">%</span> <span class="char">','</span>
    41. 

  41. </pre>
    42. 

  42. <p>
    43. 

  43.         read as: a list of doubles separated by <code class="computeroutput"><span class="char">','</span></code>.
    44. 

  44.       </p>
    45. 

  45. <p>
    46. 

  46.         This sample, again a variation of our previous example, demonstrates just
    47. 

  47.         that:
    48. 

  48.       </p>
    49. 

  49. <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
    50. 

  50. <span class="keyword">bool</span> <span class="identifier">parse_numbers</span><span class="special">(</span><span class="identifier">Iterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">&gt;&amp;</span> <span class="identifier">v</span><span class="special">)</span>
    51. 

  51. <span class="special">{</span>
    52. 

  52.     <span class="keyword">using</span> <span class="identifier">x3</span><span class="special">::</span><span class="identifier">double_</span><span class="special">;</span>
    53. 

  53.     <span class="keyword">using</span> <span class="identifier">x3</span><span class="special">::</span><span class="identifier">phrase_parse</span><span class="special">;</span>
    54. 

  54.     <span class="keyword">using</span> <span class="identifier">x3</span><span class="special">::</span><span class="identifier">_attr</span><span class="special">;</span>
    55. 

  55.     <span class="keyword">using</span> <span class="identifier">ascii</span><span class="special">::</span><span class="identifier">space</span><span class="special">;</span>
    56. 

  56. 

  57.     <span class="keyword">auto</span> <span class="identifier">push_back</span> <span class="special">=</span> <span class="special">[&amp;](</span><span class="keyword">auto</span><span class="special">&amp;</span> <span class="identifier">ctx</span><span class="special">){</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">_attr</span><span class="special">(</span><span class="identifier">ctx</span><span class="special">));</span> <span class="special">};</span>
    58. 

  58. 

  59.     <span class="keyword">bool</span> <span class="identifier">r</span> <span class="special">=</span> <span class="identifier">phrase_parse</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span>
    60. 

  60. 

  61.         <span class="comment">//  Begin grammar</span>
    62. 

  62.         <span class="special">(</span>
    63. 

  63.             <span class="identifier">double_</span><span class="special">[</span><span class="identifier">push_back</span><span class="special">]</span> <span class="special">%</span> <span class="char">','</span>
    64. 

  64.         <span class="special">)</span>
    65. 

  65.         <span class="special">,</span>
    66. 

  66.         <span class="comment">//  End grammar</span>
    67. 

  67. 

  68.         <span class="identifier">space</span><span class="special">);</span>
    69. 

  69. 

  70.     <span class="keyword">if</span> <span class="special">(</span><span class="identifier">first</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">)</span> <span class="comment">// fail if we did not get a full match</span>
    71. 

  71.         <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span>
    72. 

  72.     <span class="keyword">return</span> <span class="identifier">r</span><span class="special">;</span>
    73. 

  73. <span class="special">}</span>
    74. 

  74. </pre>
    75. 

  75. <p>
    76. 

  76.         The full cpp file for this example can be found here: <a href="../../../../../example/x3/num_list/num_list3.cpp" target="_top">num_list3.cpp</a>
    77. 

  77.       </p>
    78. 

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    80. 

  80. <td align="left"></td>
    81. 

  81. <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2018 Joel de Guzman,
    82. 

  82.       Hartmut Kaiser<p>
    83. 

  83.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    84. 

  84.         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>)
    85. 

  85.       </p>
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