OffByOneScalar.h

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// 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_;
};