Added missing include

6dec9abf · Davis King · f15e4e58 · 6dec9abf
Commit 6dec9abf authored Jul 05, 2019 by Davis King
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isotonic_regression.h dlib/optimization/isotonic_regression.h +1 -0

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--- a/dlib/optimization/isotonic_regression.h
+++ b/dlib/optimization/isotonic_regression.h
@@ -6,6 +6,7 @@
 #include "isotonic_regression_abstract.h"
 #include <vector>
 #include <utility>
+#include <cstddef>

 namespace dlib
 {