TensorValue.h

// Copyright 2023, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
// OPEN SOURCE LICENSE (MIT)
//
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#pragma once
 
#include "neml2/tensors/BatchTensor.h"
#include "neml2/misc/parser_utils.h"
 
namespace neml2
{
class TensorValueBase
{
public:
  virtual ~TensorValueBase() = default;
 
  virtual void to(const torch::TensorOptions &) = 0;
 
  virtual operator BatchTensor() const = 0;
 
  virtual void set(const BatchTensor & val) = 0;
};
 
template <typename T>
class TensorValue : public TensorValueBase
{
public:
  TensorValue() = default;
 
  TensorValue(const T & value)
    : _value(value)
  {
  }
 
  virtual void to(const torch::TensorOptions & options) override { _value = _value.to(options); }
 
  virtual operator BatchTensor() const override { return _value; }
 
  template <typename T2 = T, typename = typename std::enable_if_t<!std::is_same_v<T2, BatchTensor>>>
  operator T() const
  {
    return _value;
  }
 
  T & value() { return _value; }
 
  virtual void set(const BatchTensor & val) override { _value = val; }
 
private:
  T _value;
};
} // namespace neml2