initial commit

third_party/eigen/test/OffByOneScalar.h

@@ -0,0 +1,20 @@
+
+// A Scalar with internal representation T+1 so that zero is internally
+// represented by T(1). This is used to test memory fill.
+//
+#pragma once
+template <typename T>
+class OffByOneScalar {
+ public:
+  OffByOneScalar() : val_(1) {}
+  OffByOneScalar(const OffByOneScalar& other) = default;
+  OffByOneScalar& operator=(const OffByOneScalar& other) = default;
+
+  OffByOneScalar(T val) : val_(val + 1) {}
+  OffByOneScalar& operator=(T val) { val_ = val + 1; }
+
+  operator T() const { return val_ - 1; }
+
+ private:
+  T val_;
+};