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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="spirit.qi.tutorials.number_list___stuffing_numbers_into_a_std__vector"></a><a class="link" href="number_list___stuffing_numbers_into_a_std__vector.html" title="Number List - stuffing numbers into a std::vector">Number |
| List - stuffing numbers into a std::vector</a> |
| </h4></div></div></div> |
| <p> |
| This sample demonstrates a parser for a comma separated list of numbers. |
| The numbers are inserted in a vector using phoenix. |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">></span> |
| <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"><</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">using</span> <span class="identifier">qi</span><span class="special">::</span><span class="identifier">double_</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">qi</span><span class="special">::</span><span class="identifier">phrase_parse</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">qi</span><span class="special">::</span><span class="identifier">_1</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">ascii</span><span class="special">::</span><span class="identifier">space</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">push_back</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">ref</span><span class="special">;</span> |
| |
| <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> |
| |
| <span class="comment">// Begin grammar |
| </span> <span class="special">(</span> |
| <span class="identifier">double_</span><span class="special">[</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">v</span><span class="special">),</span> <span class="identifier">_1</span><span class="special">)]</span> |
| <span class="special">>></span> <span class="special">*(</span><span class="char">','</span> <span class="special">>></span> <span class="identifier">double_</span><span class="special">[</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">v</span><span class="special">),</span> <span class="identifier">_1</span><span class="special">)])</span> |
| <span class="special">)</span> |
| <span class="special">,</span> |
| <span class="comment">// End grammar |
| </span> |
| <span class="identifier">space</span><span class="special">);</span> |
| |
| <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> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> |
| <span class="keyword">return</span> <span class="identifier">r</span><span class="special">;</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| The full cpp file for this example can be found here: <a href="../../../../../example/qi/num_list2.cpp" target="_top">../../example/qi/num_list2.cpp</a> |
| </p> |
| <p> |
| This, again, is the same parser as before. This time, instead of summing |
| up the numbers, we stuff them in a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span></code>. |
| <code class="computeroutput"><span class="identifier">push_back</span></code> is supplied by |
| <a href="../../../../../phoenix/doc/html/index.html" target="_top">Phoenix</a>. The expression: |
| </p> |
| <pre class="programlisting"><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">v</span><span class="special">),</span> <span class="identifier">_1</span><span class="special">)</span> |
| </pre> |
| <p> |
| appends the parsed number. Like before, <code class="computeroutput"><span class="identifier">_1</span></code> |
| is a <a href="../../../../../phoenix/doc/html/index.html" target="_top">Phoenix</a> placeholder |
| for the parsed result attribute. Also, like before, <code class="computeroutput"><span class="identifier">ref</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span></code> |
| tells <a href="../../../../../phoenix/doc/html/index.html" target="_top">Phoenix</a> that |
| <code class="computeroutput"><span class="identifier">v</span></code>, the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span></code>, |
| is a mutable reference. |
| </p> |
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