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Boost.RangeEx merged into Boost.Range
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Neil Groves
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<div class="section" title="Method 3.1: Implement a Range Adaptor without arguments">
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<div class="titlepage"><div><div><h5 class="title">
|
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<a name="range.reference.extending.method_3.method_3_1"></a><a class="link" href="method_3_1.html" title="Method 3.1: Implement a Range Adaptor without arguments"> Method
|
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3.1: Implement a Range Adaptor without arguments</a>
|
||||
</h5></div></div></div>
|
||||
<p>
|
||||
To implement a Range Adaptor without arguments (e.g. reversed) you need
|
||||
to:
|
||||
</p>
|
||||
<div class="orderedlist"><ol class="orderedlist" type="1">
|
||||
<li class="listitem">
|
||||
Provide a range for your return type, for example:
|
||||
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">iterator_range</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">boost</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">reverse_iterator</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
||||
|
||||
<span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">R</span> <span class="special">></span>
|
||||
<span class="keyword">struct</span> <span class="identifier">reverse_range</span> <span class="special">:</span>
|
||||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_range</span><span class="special"><</span>
|
||||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">reverse_iterator</span><span class="special"><</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">R</span><span class="special">>::</span><span class="identifier">type</span><span class="special">></span> <span class="special">></span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">private</span><span class="special">:</span>
|
||||
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_range</span><span class="special"><</span>
|
||||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">reverse_iterator</span><span class="special"><</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">R</span><span class="special">>::</span><span class="identifier">type</span><span class="special">></span> <span class="special">></span> <span class="identifier">base</span><span class="special">;</span>
|
||||
|
||||
<span class="keyword">public</span><span class="special">:</span>
|
||||
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">reverse_iterator</span><span class="special"><</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">R</span><span class="special">>::</span><span class="identifier">type</span> <span class="special">></span> <span class="identifier">iterator</span><span class="special">;</span>
|
||||
|
||||
<span class="identifier">reverse_range</span><span class="special">(</span><span class="identifier">R</span><span class="special">&</span> <span class="identifier">r</span><span class="special">)</span>
|
||||
<span class="special">:</span> <span class="identifier">base</span><span class="special">(</span><span class="identifier">iterator</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">r</span><span class="special">)),</span> <span class="identifier">iterator</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">r</span><span class="special">)))</span>
|
||||
<span class="special">{</span> <span class="special">}</span>
|
||||
<span class="special">};</span>
|
||||
</pre>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
Provide a tag to uniquely identify your adaptor in the <code class="computeroutput"><span class="keyword">operator</span><span class="special">|</span></code>
|
||||
function overload set
|
||||
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">detail</span> <span class="special">{</span>
|
||||
<span class="keyword">struct</span> <span class="identifier">reverse_forwarder</span> <span class="special">{};</span>
|
||||
<span class="special">}</span>
|
||||
</pre>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
Implement <code class="computeroutput"><span class="keyword">operator</span><span class="special">|</span></code><pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">BidirectionalRng</span> <span class="special">></span>
|
||||
<span class="keyword">inline</span> <span class="identifier">reverse_range</span><span class="special"><</span><span class="identifier">BidirectionalRng</span><span class="special">></span>
|
||||
<span class="keyword">operator</span><span class="special">|(</span> <span class="identifier">BidirectionalRng</span><span class="special">&</span> <span class="identifier">r</span><span class="special">,</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">reverse_forwarder</span> <span class="special">)</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">return</span> <span class="identifier">reverse_range</span><span class="special"><</span><span class="identifier">BidirectionalRng</span><span class="special">>(</span> <span class="identifier">r</span> <span class="special">);</span>
|
||||
<span class="special">}</span>
|
||||
|
||||
<span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">BidirectionalRng</span> <span class="special">></span>
|
||||
<span class="keyword">inline</span> <span class="identifier">reverse_range</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">BidirectionalRng</span><span class="special">></span>
|
||||
<span class="keyword">operator</span><span class="special">|(</span> <span class="keyword">const</span> <span class="identifier">BidirectionalRng</span><span class="special">&</span> <span class="identifier">r</span><span class="special">,</span> <span class="identifier">detail</span><span class="special">::</span><span class="identifier">reverse_forwarder</span> <span class="special">)</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">return</span> <span class="identifier">reverse_range</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">BidirectionalRng</span><span class="special">>(</span> <span class="identifier">r</span> <span class="special">);</span>
|
||||
<span class="special">}</span>
|
||||
</pre>
|
||||
</li>
|
||||
</ol></div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><div class="copyright-footer">Copyright © 2003 -2010 Thorsten Ottosen, Neil Groves<p>
|
||||
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||||
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>)
|
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|
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<div class="section" title="Method 3.2: Implement a Range Adaptor with arguments">
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<div class="titlepage"><div><div><h5 class="title">
|
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<a name="range.reference.extending.method_3.method_3_2"></a><a class="link" href="method_3_2.html" title="Method 3.2: Implement a Range Adaptor with arguments"> Method
|
||||
3.2: Implement a Range Adaptor with arguments</a>
|
||||
</h5></div></div></div>
|
||||
<div class="orderedlist"><ol class="orderedlist" type="1">
|
||||
<li class="listitem">
|
||||
Provide a range for your return type, for example:
|
||||
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">adaptor</span><span class="special">/</span><span class="identifier">argument_fwd</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">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">iterator_range</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">boost</span><span class="special">/</span><span class="identifier">iterator</span><span class="special">/</span><span class="identifier">transform_iterator</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
||||
|
||||
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Value</span><span class="special">></span>
|
||||
<span class="keyword">class</span> <span class="identifier">replace_value</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">public</span><span class="special">:</span>
|
||||
<span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">Value</span><span class="special">&</span> <span class="identifier">result_type</span><span class="special">;</span>
|
||||
<span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">Value</span><span class="special">&</span> <span class="identifier">argument_type</span><span class="special">;</span>
|
||||
|
||||
<span class="identifier">replace_value</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Value</span><span class="special">&</span> <span class="identifier">from</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">Value</span><span class="special">&</span> <span class="identifier">to</span><span class="special">)</span>
|
||||
<span class="special">:</span> <span class="identifier">m_from</span><span class="special">(</span><span class="identifier">from</span><span class="special">),</span> <span class="identifier">m_to</span><span class="special">(</span><span class="identifier">to</span><span class="special">)</span>
|
||||
<span class="special">{</span>
|
||||
<span class="special">}</span>
|
||||
|
||||
<span class="keyword">const</span> <span class="identifier">Value</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">Value</span><span class="special">&</span> <span class="identifier">x</span><span class="special">)</span> <span class="keyword">const</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">return</span> <span class="special">(</span><span class="identifier">x</span> <span class="special">==</span> <span class="identifier">m_from</span><span class="special">)</span> <span class="special">?</span> <span class="identifier">m_to</span> <span class="special">:</span> <span class="identifier">x</span><span class="special">;</span>
|
||||
<span class="special">}</span>
|
||||
<span class="keyword">private</span><span class="special">:</span>
|
||||
<span class="identifier">Value</span> <span class="identifier">m_from</span><span class="special">;</span>
|
||||
<span class="identifier">Value</span> <span class="identifier">m_to</span><span class="special">;</span>
|
||||
<span class="special">};</span>
|
||||
|
||||
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Range</span><span class="special">></span>
|
||||
<span class="keyword">class</span> <span class="identifier">replace_range</span>
|
||||
<span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_range</span><span class="special"><</span>
|
||||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">transform_iterator</span><span class="special"><</span>
|
||||
<span class="identifier">replace_value</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_value</span><span class="special"><</span><span class="identifier">Range</span><span class="special">>::</span><span class="identifier">type</span><span class="special">>,</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">Range</span><span class="special">>::</span><span class="identifier">type</span><span class="special">></span> <span class="special">></span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">private</span><span class="special">:</span>
|
||||
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_value</span><span class="special"><</span><span class="identifier">Range</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">value_type</span><span class="special">;</span>
|
||||
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">Range</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">iterator_base</span><span class="special">;</span>
|
||||
<span class="keyword">typedef</span> <span class="identifier">replace_value</span><span class="special"><</span><span class="identifier">value_type</span><span class="special">></span> <span class="identifier">Fn</span><span class="special">;</span>
|
||||
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">transform_iterator</span><span class="special"><</span><span class="identifier">Fn</span><span class="special">,</span> <span class="identifier">iterator_base</span><span class="special">></span> <span class="identifier">replaced_iterator</span><span class="special">;</span>
|
||||
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">iterator_range</span><span class="special"><</span><span class="identifier">replaced_iterator</span><span class="special">></span> <span class="identifier">base_t</span><span class="special">;</span>
|
||||
|
||||
<span class="keyword">public</span><span class="special">:</span>
|
||||
<span class="identifier">replace_range</span><span class="special">(</span><span class="identifier">Range</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span> <span class="identifier">value_type</span> <span class="identifier">from</span><span class="special">,</span> <span class="identifier">value_type</span> <span class="identifier">to</span><span class="special">)</span>
|
||||
<span class="special">:</span> <span class="identifier">base_t</span><span class="special">(</span><span class="identifier">replaced_iterator</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">rng</span><span class="special">),</span> <span class="identifier">Fn</span><span class="special">(</span><span class="identifier">from</span><span class="special">,</span><span class="identifier">to</span><span class="special">)),</span>
|
||||
<span class="identifier">replaced_iterator</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">rng</span><span class="special">),</span> <span class="identifier">Fn</span><span class="special">(</span><span class="identifier">from</span><span class="special">,</span><span class="identifier">to</span><span class="special">)))</span>
|
||||
<span class="special">{</span>
|
||||
<span class="special">}</span>
|
||||
<span class="special">};</span>
|
||||
</pre>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
Implement a holder class to hold the arguments required to construct
|
||||
the RangeAdaptor.
|
||||
</li>
|
||||
</ol></div>
|
||||
<p>
|
||||
The holder combines multiple parameters into one that can be passed as
|
||||
the right operand of <code class="computeroutput"><span class="keyword">operator</span><span class="special">|()</span></code>.
|
||||
</p>
|
||||
<p>
|
||||
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
|
||||
<span class="keyword">class</span> <span class="identifier">replace_holder</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_detail</span><span class="special">::</span><span class="identifier">holder2</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">public</span><span class="special">:</span>
|
||||
<span class="identifier">replace_holder</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&</span> <span class="identifier">from</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">T</span><span class="special">&</span> <span class="identifier">to</span><span class="special">)</span>
|
||||
<span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_detail</span><span class="special">::</span><span class="identifier">holder2</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">from</span><span class="special">,</span> <span class="identifier">to</span><span class="special">)</span>
|
||||
<span class="special">{</span> <span class="special">}</span>
|
||||
<span class="keyword">private</span><span class="special">:</span>
|
||||
<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">replace_holder</span><span class="special">&);</span>
|
||||
<span class="special">};</span>
|
||||
</pre>
|
||||
<p>
|
||||
</p>
|
||||
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
|
||||
Define an instance of the holder with the name of the adaptor
|
||||
</li></ol></div>
|
||||
<p>
|
||||
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">static</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_detail</span><span class="special">::</span><span class="identifier">forwarder2</span><span class="special"><</span><span class="identifier">replace_holder</span><span class="special">></span>
|
||||
<span class="identifier">replaced</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_detail</span><span class="special">::</span><span class="identifier">forwarder2</span><span class="special"><</span><span class="identifier">replace_holder</span><span class="special">>();</span>
|
||||
</pre>
|
||||
<p>
|
||||
</p>
|
||||
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
|
||||
Define <code class="computeroutput"><span class="keyword">operator</span><span class="special">|</span></code>
|
||||
</li></ol></div>
|
||||
<p>
|
||||
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">SinglePassRange</span><span class="special">></span>
|
||||
<span class="keyword">inline</span> <span class="identifier">replace_range</span><span class="special"><</span><span class="identifier">SinglePassRange</span><span class="special">></span>
|
||||
<span class="keyword">operator</span><span class="special">|(</span><span class="identifier">SinglePassRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span>
|
||||
<span class="keyword">const</span> <span class="identifier">replace_holder</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_value</span><span class="special"><</span><span class="identifier">SinglePassRange</span><span class="special">>::</span><span class="identifier">type</span><span class="special">>&</span> <span class="identifier">f</span><span class="special">)</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">return</span> <span class="identifier">replace_range</span><span class="special"><</span><span class="identifier">SinglePassRange</span><span class="special">>(</span><span class="identifier">rng</span><span class="special">,</span> <span class="identifier">f</span><span class="special">.</span><span class="identifier">val1</span><span class="special">,</span> <span class="identifier">f</span><span class="special">.</span><span class="identifier">val2</span><span class="special">);</span>
|
||||
<span class="special">}</span>
|
||||
|
||||
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">SinglePassRange</span><span class="special">></span>
|
||||
<span class="keyword">inline</span> <span class="identifier">replace_range</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">SinglePassRange</span><span class="special">></span>
|
||||
<span class="keyword">operator</span><span class="special">|(</span><span class="keyword">const</span> <span class="identifier">SinglePassRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span>
|
||||
<span class="keyword">const</span> <span class="identifier">replace_holder</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_value</span><span class="special"><</span><span class="identifier">SinglePassRange</span><span class="special">>::</span><span class="identifier">type</span><span class="special">>&</span> <span class="identifier">f</span><span class="special">)</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">return</span> <span class="identifier">replace_range</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">SinglePassRange</span><span class="special">>(</span><span class="identifier">rng</span><span class="special">,</span> <span class="identifier">f</span><span class="special">.</span><span class="identifier">val1</span><span class="special">,</span> <span class="identifier">f</span><span class="special">.</span><span class="identifier">val2</span><span class="special">);</span>
|
||||
<span class="special">}</span>
|
||||
</pre>
|
||||
<p>
|
||||
</p>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><div class="copyright-footer">Copyright © 2003 -2010 Thorsten Ottosen, Neil Groves<p>
|
||||
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||||
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>)
|
||||
</p>
|
||||
</div></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
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|
||||
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||||
Reference in New Issue
Block a user