TensorValue.h

// Copyright 2024, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
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#pragma once
 
#include "neml2/tensors/Tensor.h"
 
namespace neml2
{
// Forward declaration
enum class TensorType : int8_t;

class TensorValueBase
{
public:
  TensorValueBase() = default;
 
  TensorValueBase(const TensorValueBase &) = default;
  TensorValueBase(TensorValueBase &&) noexcept = default;
  TensorValueBase & operator=(const TensorValueBase &) = default;
  TensorValueBase & operator=(TensorValueBase &&) noexcept = default;
  virtual ~TensorValueBase() = default;

  virtual void to_(const TensorOptions &) = 0;

  virtual void requires_grad_(bool req = true) = 0;

  virtual operator Tensor() const = 0;

  virtual void operator=(const Tensor & val) = 0;

  virtual TensorType type() const = 0;
};

template <typename T>
class TensorValue : public TensorValueBase
{
public:
  explicit TensorValue(T value)
    : _value(std::move(value))
  {
  }
 
  void to_(const TensorOptions & options) override;
  void requires_grad_(bool req = true) override;
  operator Tensor() const override;
  void operator=(const Tensor & val) override;
  TensorType type() const override;
  T & value() { return _value; }
 
private:
  T _value;
};
} // namespace neml2