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<font size="6" face="Verdana, Arial, Helvetica, sans-serif"><b>number_list.cpp</b></font>
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<span class=comment>///////////////////////////////////////////////////////////////////////////////
</span><span class=comment>//
</span><span class=comment>// A parser for a comma separated list of numbers
</span><span class=comment>//
</span><span class=comment>// [ JDG 5/10/2002 ]
</span><span class=comment>//
</span><span class=comment>///////////////////////////////////////////////////////////////////////////////
</span><span class=preprocessor>#include </span><span class=special><</span><span class=identifier>boost</span><span class=special>/</span><span class=identifier>spirit</span><span class=special>/</span><span class=identifier>core</span><span class=special>.</span><span class=identifier>hpp</span><span class=special>>
</span><span class=preprocessor>#include </span><span class=special><</span><span class=identifier>iostream</span><span class=special>>
</span><span class=preprocessor>#include </span><span class=special><</span><span class=identifier>vector</span><span class=special>>
</span><span class=comment>///////////////////////////////////////////////////////////////////////////////
</span><span class=keyword>using </span><span class=keyword>namespace </span><span class=identifier>std</span><span class=special>;
</span><span class=keyword>using </span><span class=keyword>namespace </span><span class=identifier>spirit</span><span class=special>;
</span><span class=comment>///////////////////////////////////////////////////////////////////////////////
</span><span class=comment>//
</span><span class=comment>// Our comma separated list parser
</span><span class=comment>//
</span><span class=comment>///////////////////////////////////////////////////////////////////////////////
</span><span class=keyword>bool
</span><span class=identifier>parse_numbers</span><span class=special>(</span><span class=keyword>char </span><span class=keyword>const</span><span class=special>* </span><span class=identifier>str</span><span class=special>, </span><span class=identifier>vector</span><span class=special><</span><span class=keyword>double</span><span class=special>>& </span><span class=identifier>v</span><span class=special>)
</span><span class=special>{
</span><span class=keyword>return </span><span class=identifier>parse</span><span class=special>(</span><span class=identifier>str</span><span class=special>,
</span><span class=comment>// Begin grammar
</span><span class=special>(
</span><span class=identifier>real_p</span><span class=special>[</span><span class=identifier>append</span><span class=special>(</span><span class=identifier>v</span><span class=special>)] </span><span class=special>>> </span><span class=special>*(</span><span class=literal>',' </span><span class=special>>> </span><span class=identifier>real_p</span><span class=special>[</span><span class=identifier>append</span><span class=special>(</span><span class=identifier>v</span><span class=special>)])
</span><span class=special>)
</span><span class=special>,
</span><span class=comment>// End grammar
</span><span class=identifier>space_p</span><span class=special>).</span><span class=identifier>full</span><span class=special>;
</span><span class=special>}
</span><span class=comment>////////////////////////////////////////////////////////////////////////////
</span><span class=comment>//
</span><span class=comment>// Main program
</span><span class=comment>//
</span><span class=comment>////////////////////////////////////////////////////////////////////////////
</span><span class=keyword>int
</span><span class=identifier>main</span><span class=special>()
</span><span class=special>{
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"/////////////////////////////////////////////////////////\n\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"\t\tA comma separated list parser for Spirit...\n\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"/////////////////////////////////////////////////////////\n\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"Give me a comma separated list of numbers.\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"The numbers will be inserted in a vector of numbers\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"Type [q or Q] to quit\n\n"</span><span class=special>;
</span><span class=keyword>for </span><span class=special>(;;)
</span><span class=special>{
</span><span class=keyword>char </span><span class=identifier>str</span><span class=special>[</span><span class=number>256</span><span class=special>];
</span><span class=identifier>cin</span><span class=special>.</span><span class=identifier>getline</span><span class=special>(</span><span class=identifier>str</span><span class=special>, </span><span class=number>256</span><span class=special>);
</span><span class=keyword>if </span><span class=special>(</span><span class=identifier>str</span><span class=special>[</span><span class=number>0</span><span class=special>] </span><span class=special>== </span><span class=literal>'q' </span><span class=special>|| </span><span class=identifier>str</span><span class=special>[</span><span class=number>0</span><span class=special>] </span><span class=special>== </span><span class=literal>'Q'</span><span class=special>)
</span><span class=keyword>break</span><span class=special>;
</span><span class=identifier>vector</span><span class=special><</span><span class=keyword>double</span><span class=special>> </span><span class=identifier>v</span><span class=special>;
</span><span class=keyword>if </span><span class=special>(</span><span class=identifier>parse_numbers</span><span class=special>(</span><span class=identifier>str</span><span class=special>, </span><span class=identifier>v</span><span class=special>))
</span><span class=special>{
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"-------------------------\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"Parsing succeeded\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=identifier>str </span><span class=special><< </span><span class=string>" Parses OK: " </span><span class=special><< </span><span class=identifier>endl</span><span class=special>;
</span><span class=keyword>for </span><span class=special>(</span><span class=keyword>int </span><span class=identifier>i </span><span class=special>= </span><span class=number>0</span><span class=special>; </span><span class=identifier>i </span><span class=special>< </span><span class=identifier>v</span><span class=special>.</span><span class=identifier>size</span><span class=special>(); </span><span class=special>++</span><span class=identifier>i</span><span class=special>)
</span><span class=identifier>cout </span><span class=special><< </span><span class=identifier>i </span><span class=special><< </span><span class=string>": " </span><span class=special><< </span><span class=identifier>v</span><span class=special>[</span><span class=identifier>i</span><span class=special>] </span><span class=special><< </span><span class=identifier>endl</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"-------------------------\n"</span><span class=special>;
</span><span class=special>}
</span><span class=keyword>else
</span><span class=special>{
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"-------------------------\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"Parsing failed\n"</span><span class=special>;
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"-------------------------\n"</span><span class=special>;
</span><span class=special>}
</span><span class=special>}
</span><span class=identifier>cout </span><span class=special><< </span><span class=string>"Bye... :-) \n\n"</span><span class=special>;
</span><span class=keyword>return </span><span class=number>0</span><span class=special>;
</span><span class=special>}</span></pre>
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<p class="copyright">Copyright © 1998-2002 Joel de Guzman<br>
<br>
<font size="2">Permission to copy, use, modify, sell and distribute this document
is granted provided this copyright notice appears in all copies. This document
is provided "as is" without express or implied warranty, and with
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