initial commit

third_party/eigen/test/SafeScalar.h

@@ -0,0 +1,33 @@
+
+// A Scalar that asserts for uninitialized access.
+template <typename T>
+class SafeScalar {
+ public:
+  SafeScalar() : initialized_(false) {}
+
+  SafeScalar(const T& val) : val_(val), initialized_(true) {}
+
+  template <typename Source>
+  explicit SafeScalar(const Source& val) : SafeScalar(T(val)) {}
+
+  operator T() const {
+    VERIFY(initialized_ && "Uninitialized access.");
+    return val_;
+  }
+
+  template <typename Target>
+  explicit operator Target() const {
+    return Target(this->operator T());
+  }
+
+ private:
+  T val_;
+  bool initialized_;
+};
+
+namespace Eigen {
+template <typename T>
+struct NumTraits<SafeScalar<T>> : GenericNumTraits<T> {
+  enum { RequireInitialization = 1 };
+};
+}  // namespace Eigen