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POpassing ‘const Link’ as ‘this’ argument of ‘std::string GetAttribute(std::string)’ discards qualifiers
 

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  1. POpassing ‘const Link’ as ‘this’ argument of ‘std::string GetAttribute(std::string)’ discards qualifiers
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    <p>I'm getting an odd error with parts of the NS-3 API. Here is my error message:</p> <pre><code>error: passing ‘const ns3::TopologyReader::Link’ as ‘this’ argument of ‘std::string ns3::TopologyReader::Link::GetAttribute(std::string)’ discards qualifiers </code></pre> <p>And here is the code causing the issue: </p> <pre><code>TopologyReader::ConstLinksIterator iter; int num = 0; for (iter = topologyReader-&gt;LinksBegin (); iter != topologyReader-&gt;LinksEnd(); iter++, num++) { std::istringstream fromName(iter-&gt;GetFromNodeName ()); std::istringstream toName (iter-&gt;GetToNodeName ()); iter-&gt;GetToNodeName(); std::string w = "Weight"; std::string weightAttr = (iter)-&gt;GetAttribute(w); // &lt;- error /* snip */ } </code></pre> <p>I think it might have to do with the fact that <code>GetAttribute(std::string)</code> is not a <code>const</code> function, according to the <a href="http://www.nsnam.org/doxygen-release/classns3_1_1_topology_reader_1_1_link.html" rel="nofollow">documentation for TopologyReader::Link</a>, while the other functions, <code>GetFromNodeName(void)</code> and <code>GetToNodeName(void)</code> are declared as <code>const</code> functions. However, I'm not sure how to fix this problem.</p> <p>Edit: The function signatures are as shown (from the linked documentation):</p> <pre><code>std::string ns3::TopologyReader::Link::GetFromNodeName (void) const std::string ns3::TopologyReader::Link::GetToNodeName (void) const std::string ns3::TopologyReader::Link::GetAttribute (std::string name) </code></pre>
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    1. COOoops. I missed that, sorry. You may want to report this as a bug. It does look like one.
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      1. USR. Martinho Fernandes
 

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