LabeledAxisAccessor.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 <vector>
#include <iostream>
 
#include <c10/util/SmallVector.h>
#include <c10/util/ArrayRef.h>
 
namespace neml2
{
class LabeledAxisAccessor
{
public:
  LabeledAxisAccessor() = default;
 
  ~LabeledAxisAccessor() {}
 
  template <typename... S>
  LabeledAxisAccessor(const char * name, S &&... names)
  {
    validate_item_name(name);
    _item_names.push_back(name);
 
    (validate_item_name(names), ...);
    (_item_names.push_back(names), ...);
  }
 
  template <typename... S>
  LabeledAxisAccessor(const std::string & name, S &&... names)
  {
    validate_item_name(name);
    _item_names.push_back(name);
 
    (validate_item_name(names), ...);
    (_item_names.push_back(names), ...);
  }
 
  template <typename Container,
            typename = std::enable_if_t<!std::is_convertible_v<Container, std::string>>>
  LabeledAxisAccessor(const Container & c)
  {
    _item_names.append(c.begin(), c.end());
    for (const auto & name : _item_names)
      validate_item_name(name);
  }
 
  using iterator = c10::SmallVector<std::string>::iterator;
  using const_iterator = c10::SmallVector<std::string>::const_iterator;
 
  iterator begin() { return iterator(_item_names.begin()); }
  iterator end() { return iterator(_item_names.end()); }
  const_iterator begin() const { return const_iterator(_item_names.begin()); }
  const_iterator end() const { return const_iterator(_item_names.end()); }
 
  explicit operator std::vector<std::string>() const;
 
  const c10::SmallVector<std::string> & vec() const { return _item_names; }
 
  bool empty() const;
 
  size_t size() const;
 
  LabeledAxisAccessor with_suffix(const std::string & suffix) const;
 
  LabeledAxisAccessor append(const LabeledAxisAccessor & axis) const;
 
  LabeledAxisAccessor prepend(const LabeledAxisAccessor & axis) const;
 
  LabeledAxisAccessor slice(size_t n) const;
 
  LabeledAxisAccessor slice(size_t n1, size_t n2) const;
 
  LabeledAxisAccessor remount(const LabeledAxisAccessor & axis, size_t n = 1) const;
 
  bool start_with(const LabeledAxisAccessor & axis) const;
 
  LabeledAxisAccessor old() const;
 
private:
  void validate_item_name(const std::string &) const;
 
  c10::SmallVector<std::string> _item_names;
};
 
bool operator==(const LabeledAxisAccessor & a, const LabeledAxisAccessor & b);
 
bool operator!=(const LabeledAxisAccessor & a, const LabeledAxisAccessor & b);
 
bool operator<(const LabeledAxisAccessor & a, const LabeledAxisAccessor & b);
 
std::ostream & operator<<(std::ostream & os, const LabeledAxisAccessor & accessor);
 
namespace indexing
{
using TensorLabel = LabeledAxisAccessor;
using TensorLabels = c10::SmallVector<LabeledAxisAccessor>;
using TensorLabelsRef = c10::ArrayRef<LabeledAxisAccessor>;
} // namespace indexing
} // namespace neml2