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<p class="MsoNormal">I’m writing code to add filters when reading las files.<o:p></o:p></p>
<p class="MsoNormal">All examples are in json format, and I’m wondering what is the best way to do this in C++.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve been looking at the tests from the source code, to get examples, but I can’t find any that combine different kinds of filters.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Code example (Semi Pseudo): <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> (</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">useFilters</span><span style="font-size:9.5pt;font-family:Consolas;color:black">)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> {</span><span style="font-size:9.5pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">bool</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">filterInputIsSet</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> =
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">false</span><span style="font-size:9.5pt;font-family:Consolas;color:black">;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><i><span style="font-size:9.5pt;font-family:Consolas;color:blue">LasReader</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">filterReader</span><span style="font-size:9.5pt;font-family:Consolas;color:black">;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#880000">prepareLasReader</span><span style="font-size:9.5pt;font-family:Consolas;color:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">filterReader</span><span style="font-size:9.5pt;font-family:Consolas;color:black">,
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">fileName</span><span style="font-size:9.5pt;font-family:Consolas;color:black">);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> </span><span style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
(</span><span style="font-size:9.5pt;font-family:Consolas">useCropFilter<span style="color:black">)<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> {
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas">c<span style="color:navy">r</span>o<span style="color:navy">pOptions</span><span style="color:black">.</span><span style="color:#880000">add</span><span style="color:black">(</span><span style="color:#A31515">"bounds"</span><span style="color:black">,
</span>someB<span style="color:navy">ounds</span><span style="color:black">);<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> (!</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">filterInputIsSet</span><span style="font-size:9.5pt;font-family:Consolas;color:black">)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">crpFilter</span><span style="font-size:9.5pt;font-family:Consolas;color:black">.</span><i><span style="font-size:9.5pt;font-family:Consolas;color:#880000">setInput</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">filterReader</span><span style="font-size:9.5pt;font-family:Consolas;color:black">);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">filterInputIsSet</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> =
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">true</span><span style="font-size:9.5pt;font-family:Consolas;color:black">;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:navy"> cropFilter</span><span style="font-size:9.5pt;font-family:Consolas;color:black">.</span><i><span style="font-size:9.5pt;font-family:Consolas;color:#880000">addOptions</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">cropOptions</span><span style="font-size:9.5pt;font-family:Consolas;color:black">);</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> }</span><span style="font-size:9.5pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> (</span><span style="font-size:9.5pt;font-family:Consolas">useClassFilter<span style="color:black">)<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">std</span><span style="font-size:9.5pt;font-family:Consolas;color:black">::</span><i><span style="font-size:9.5pt;font-family:Consolas;color:blue">string</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">classFilterString</span><span style="font-size:9.5pt;font-family:Consolas;color:black">;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">for</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> (</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">int</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">i</span><span style="font-size:9.5pt;font-family:Consolas;color:black">=0;
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">i</span><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:black"><= </span><span style="color:blue">ClassificationType</span><span style="color:black">::</span><span style="color:#A000A0">eOverlapPoints</span><span style="color:black">;
</span><span style="color:navy">i</span><span style="color:black">++)<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas">addClassToString(<span style="color:navy">classFilterString</span>);<span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">r</span><span style="font-size:9.5pt;font-family:Consolas">a<span style="color:navy">ng</span>e<span style="color:navy">Options</span><span style="color:black">.</span><span style="color:#880000">add</span><span style="color:black">(</span><span style="color:#A31515">"limits"</span><span style="color:black">,
</span><span style="color:navy">classFilterString</span><span style="color:black">);<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> (!</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">filterInputIsSet</span><span style="font-size:9.5pt;font-family:Consolas;color:black">)
</span><span style="font-size:9.5pt;font-family:Consolas;color:green">// Only r</span><span style="font-size:9.5pt;font-family:Consolas">a<span style="color:green">ng</span>e<span style="color:green">Filter is used</span><span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:navy">r</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas">a<span style="color:navy">ng</span>e<span style="color:navy">Filter</span><span style="color:black">.</span><i><span style="color:#880000">setInput</span></i><span style="color:black">(</span><span style="color:navy">filterReader</span><span style="color:black">);<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:navy">filterInputIsSet</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black"> =
</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:blue">true</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black">;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">else</span><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:green">// Both filters are used</span><span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:navy">rngFilter</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black">.</span><i><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:#880000">setInput</span></i><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black">(</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:navy">cr</span><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas">o<span style="color:navy">pFilter</span><span style="color:black">);</span>
<span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="NO-BOK" style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">r</span><span style="font-size:9.5pt;font-family:Consolas">an<span style="color:navy">g</span>e<span style="color:navy">Filter</span><span style="color:black">.</span><i><span style="color:#880000">setOptions</span></i><span style="color:black">(</span><span style="color:navy">r</span>a<span style="color:navy">ng</span>e<span style="color:navy">Options</span><span style="color:black">);<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">r</span><span style="font-size:9.5pt;font-family:Consolas">an<span style="color:navy">g</span>e<span style="color:navy">Filter</span><span style="color:black">.</span><span style="color:#880000">prepare</span><span style="color:black">(</span><span style="color:navy">table</span><span style="color:black">);<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view_set</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">=</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">r</span><span style="font-size:9.5pt;font-family:Consolas">an<span style="color:navy">g</span>e<span style="color:navy">Filter</span><span style="color:black">.</span><span style="color:#880000">execute</span><span style="color:black">(</span><span style="color:navy">table</span><span style="color:black">);<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">=</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">*</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view_set</span><span style="font-size:9.5pt;font-family:Consolas;color:black">.</span><i><span style="font-size:9.5pt;font-family:Consolas;color:#880000">begin</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">else</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:green">// Only cr</span><span style="font-size:9.5pt;font-family:Consolas">o<span style="color:green">pFilter is used</span><span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">cr</span><span style="font-size:9.5pt;font-family:Consolas">o<span style="color:navy">pFilter</span><span style="color:black">.</span><span style="color:#880000">prepare</span><span style="color:black">(</span><span style="color:navy">table</span><span style="color:black">);<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view_set</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">=</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">cr</span><span style="font-size:9.5pt;font-family:Consolas">o<span style="color:navy">pFilter</span><span style="color:black">.</span><span style="color:#880000">execute</span><span style="color:black">(</span><span style="color:navy">table</span><span style="color:black">);<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">=</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">*</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view_set</span><span style="font-size:9.5pt;font-family:Consolas;color:black">.</span><i><span style="font-size:9.5pt;font-family:Consolas;color:#880000">begin</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">else </span>
<span style="font-size:9.5pt;font-family:Consolas;color:green">// No filters are used</span><span style="font-size:9.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><i><span style="font-size:9.5pt;font-family:Consolas;color:blue">LasReader</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">.</span><span style="font-size:9.5pt;font-family:Consolas;color:#880000">prepare</span><span style="font-size:9.5pt;font-family:Consolas;color:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">table</span><span style="font-size:9.5pt;font-family:Consolas;color:black">);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view_set</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">=</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><i><span style="font-size:9.5pt;font-family:Consolas;color:blue">LasReader</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">.</span><span style="font-size:9.5pt;font-family:Consolas;color:#880000">execute</span><span style="font-size:9.5pt;font-family:Consolas;color:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">table</span><span style="font-size:9.5pt;font-family:Consolas;color:black">);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">=</span><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:teal">*</span><span style="font-size:9.5pt;font-family:Consolas;color:navy">point_view_set</span><span style="font-size:9.5pt;font-family:Consolas;color:black">.</span><i><span style="font-size:9.5pt;font-family:Consolas;color:#880000">begin</span></i><span style="font-size:9.5pt;font-family:Consolas;color:black">();<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there a better, and more elegant way to do this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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