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POc++ insert to a stream with formatting for hex
 

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    <p>I often do something like:</p> <pre><code>uint8_t c=some_value; std::cout &lt;&lt; std::setfill('0') &lt;&lt; std::setw(2); std::cout &lt;&lt; std::hex &lt;&lt; int(c); std::cout &lt;&lt; std::setfill(' '); </code></pre> <p>(in particular while dumping debugging information). Wouldn't it be nice to have something manipulatorish that I could put in a stream like this:</p> <p>std::cout &lt;&lt; "c value: 0x" &lt;&lt; hexb(c) &lt;&lt; '\n';</p> <p>that would do all of that? Does anyone know how to do that?</p> <p>I've gotten this to work but would love to have a simpler way:</p> <pre><code>#include &lt;iostream&gt; #include &lt;iomanip&gt; class hexcdumper{ public: hexcdumper(uint8_t c):c(c){}; std::ostream&amp; operator( )(std::ostream&amp; os) const { // set fill and width and save the previous versions to be restored later char fill=os.fill('0'); std::streamsize ss=os.width(2); // save the format flags so we can restore them after setting std::hex std::ios::fmtflags ff=os.flags(); // output the character with hex formatting os &lt;&lt; std::hex &lt;&lt; int(c); // now restore the fill, width and flags os.fill(fill); os.width(ss); os.flags(ff); return os; } private: uint8_t c; }; hexcdumper hexb(uint8_t c) { // dump a hex byte with width 2 and a fill character of '0' return(hexcdumper(c)); } std::ostream&amp; operator&lt;&lt;(std::ostream&amp; os, const hexcdumper&amp; hcd) { return(hcd(os)); } </code></pre> <p>When I do this: </p> <pre><code>std::cout &lt;&lt; "0x" &lt;&lt; hexb(14) &lt;&lt; '\n'; </code></pre> <ol> <li>hexb(c) is invoked and returns a hexcdumper whose constructor saves c</li> <li>the overloaded operator&lt;&lt; for hexcdumper invokes hexcdumper::operator() passing it the stream</li> <li>hexcdumper's operator() does all the magic for us</li> <li>after hexcdumper::operator() returns, the overloaded operator&lt;&lt; returns the stream as returned from hexcdumper::operator() so chaining works.</li> </ol> <p>On the output, I see:</p> <pre><code>0x0e </code></pre> <p>Is there a simpler way to do this?</p> <p>Patrick</p>
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    1. COWhat's wrong with your solution you think? Looks fine for me, and if it does what you want. **Elegance** is overated!!
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