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POC++ Operator overloading example
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  1. POC++ Operator overloading example
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    copied!<p>Well, I'm new to operator overloading, and I found this problem. Instead of documenting myself, I prefer to ask you :D</p> <p>The point is, I know how to do simple operator overloading, but I'm facing problems with stacking operators. I'll try to put a relatively simple example:</p> <pre><code>struct dxfdat { int a; string b; /* here is the question */ } /* use: */ dxfdat example; example &lt;&lt; "lalala" &lt;&lt; 483 &lt;&lt; "puff" &lt;&lt; 1029 &lt;&lt; endl; </code></pre> <p><code>"lalala" &lt;&lt; 483 &lt;&lt; "puff" &lt;&lt; 1029 &lt;&lt; endl</code> shall be stored in <code>b</code>.</p> <p><code>dxfdat&amp; operator&lt;&lt; (T a)</code> and things like that work with one parameter <code>(example &lt;&lt; 7)</code>, but I would like it to work in a '<code>cout</code>' fashion.</p> <p>Sorry to be so lazy.</p> <p>EDIT:</p> <p>The real thing... Ok, it is a little bit trickier... actually, b isn't a string, but a vector of other objects, and <code>example &lt;&lt; "lalala" &lt;&lt; 483 &lt;&lt; "puff" &lt;&lt; 1029 &lt;&lt; endl</code> should just create just one object.</p> <p>This is what I'm trying (translated), though I have no clue on how to tell it when to create the object (as it goes from left to right, doesn't it?):</p> <pre><code>struct dxfDato { dxfDato(int c = 0, string v = 0, int t = 0) { cod = c; val= v; ty = t; } int ty; int cod; string val; }; struct dxfItem { int cl; string val; vector&lt;dxfDato&gt; dats; vector&lt;dxfItem&gt; sons; template &lt;class T&gt; dxfItem &amp;operator&lt;&lt;(const T &amp;t) { dxfDato dd; std::stringstream ss; ss &lt;&lt; t; val = ss; dats.push_back(dd); // this way, it creates a lot of objects return d; } }; dxfItem headers; headers &lt;&lt; "lalala" &lt;&lt; 54789 &lt;&lt; "sdfa" &lt;&lt; 483 &lt;&lt; endl; // this should create *just one object* in dats vector, // and put everything on string val </code></pre> <p>Thanks for everything,</p> <p>Note: I had to extract and translate a lot of things to put it here, so I didn't check the code for stupid errors.</p> <p>(Sorry for expanding the question that much, please tell me if I'm misusing stackoverflow's question system)</p>
 

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