Slides for 2xxx.

[libguestfs-talks.git] / 2020-frama-c / 2200-range-predicates.html

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+<h1>Range predicates</h1>
+
+<pre class="code">
+    <span class="comment">/*
+     * Do not access members directly, use the functions!
+     * A non-empty range has @lob <= @upb.
+     * An empty range has @lob == @upb + 1.
+     */</span>
+</pre>
+
+<pre class="code">
+  /*@
+    predicate valid_range(struct Range range) =
+      range.lob <= range.upb + 1;
+
+    predicate empty_range(struct Range range) =
+      range.lob == range.upb + 1;
+  */
+</pre>