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    <p>One of the most useful things I once have done was my application draw the graphs ...</p> <p>In an application that had a complicated data structure specialized to the job (standard hashtable didn't do in that case ;-) I had my application output a ".dot" script that dot tool of <a href="http://www.graphviz.org/" rel="nofollow noreferrer">graphviz</a> could parse.</p> <p>It did this by having a dump routine (okay, method, it was C++) that output the .dot header </p> <pre><code> digraph g { </code></pre> <p>then walked my data structure and then wrote the footer</p> <pre><code> } </code></pre> <p>In the structure walk it wrote every pointer with</p> <pre><code> SOURCE -&gt; DESTINATION </code></pre> <p>where Source was the memory address of the referencing object preprened with O (O213435354) and Destination was the object pointed to in the same format.</p> <p>At the start of every object it also wrote</p> <pre><code>SOURCE [ .... ] </code></pre> <p>with ... being the object data.</p> <p>Whenever the application was at an "intersting" state I dumped the graph and then used the dot-tool from graphviz to visualize it. I have found a lot of pointer error quite easily that way, the eye is built to see regular structures in lines ...</p> <p>By the way I still regularily use <a href="http://www.graphviz.org/" rel="nofollow noreferrer">graphviz</a> as it is quite nice to write &amp; edit graphs with the text editor and let the tool vizualize them afterward. If I need to dress up .dot graphs for a powerpoint-spoiled audience, I load them into <a href="http://www.omnigroup.com/applications/OmniGraffle/" rel="nofollow noreferrer">OmniGraffle</a> on my mac. (And my PC-using coworkers think I have some diagramming superhero powers because with that combination I produce graphs 10 times faster than them when they use Visio)</p>
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    1. POHow do you make diagrams of memory and data structures?
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    1. USfroh42
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    1. COThanks for the reply, Graphviz looks pretty cool, but I fear its a bit too advanced for my needs. When I start something bigger I will certainly look at it again.
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