title: How do I use "scribbling" to detect mods to free blocks?
body: <p><strong>I'm trying to figure out what's corrupting my heap</strong>; I'm sure you envy me and my predicament.</p>
  
  <p><strong>SO tells me that I can turn on "Scribble" to write <code>0xAA</code> into allocs and <code>0x55</code> into deallocs, to help me figure out where things are going wrong.</strong></p>
  
  <p>Only thing is, I've got no clue where/how to make good use of this. <strong>What do I use this <em>for</em>?</strong></p>
  
  <p>(Bonus: I'm curious about why those values, specifically, are used...)</p>
  
  <p>I'm coding C/C++ in Xcode using openFrameworks and the Vamp psychoacoustic-labeling library, for what it's worth, but I think my question is more general than that.</p>