Array.h

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_ARRAY_H
#define EIGEN_ARRAY_H

// IWYU pragma: private
#include "./InternalHeaderCheck.h"

namespace Eigen {

namespace internal {
template <typename Scalar_, int Rows_, int Cols_, int Options_, int MaxRows_, int MaxCols_>
struct traits<Array<Scalar_, Rows_, Cols_, Options_, MaxRows_, MaxCols_>>
    : traits<Matrix<Scalar_, Rows_, Cols_, Options_, MaxRows_, MaxCols_>> {
  typedef ArrayXpr XprKind;
  typedef ArrayBase<Array<Scalar_, Rows_, Cols_, Options_, MaxRows_, MaxCols_>> XprBase;
};
}  // namespace internal

template <typename Scalar_, int Rows_, int Cols_, int Options_, int MaxRows_, int MaxCols_>
class Array : public PlainObjectBase<Array<Scalar_, Rows_, Cols_, Options_, MaxRows_, MaxCols_>> {
 public:
  typedef PlainObjectBase<Array> Base;
  EIGEN_DENSE_PUBLIC_INTERFACE(Array)

  enum { Options = Options_ };
  typedef typename Base::PlainObject PlainObject;

 protected:
  template <typename Derived, typename OtherDerived, bool IsVector>
  friend struct internal::conservative_resize_like_impl;

  using Base::m_storage;

 public:
  using Base::base;
  using Base::coeff;
  using Base::coeffRef;

  template <typename OtherDerived>
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array& operator=(const EigenBase<OtherDerived>& other) {
    return Base::operator=(other);
  }

  /* This overload is needed because the usage of
   *   using Base::operator=;
   * fails on MSVC. Since the code below is working with GCC and MSVC, we skipped
   * the usage of 'using'. This should be done only for operator=.
   */
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array& operator=(const Scalar& value) {
    Base::setConstant(value);
    return *this;
  }

  template <typename OtherDerived>
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array& operator=(const DenseBase<OtherDerived>& other) {
    return Base::_set(other);
  }

  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array& operator=(const Array& other) { return Base::_set(other); }

#ifdef EIGEN_INITIALIZE_COEFFS
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Array() : Base() { EIGEN_INITIALIZE_COEFFS_IF_THAT_OPTION_IS_ENABLED }
#else
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Array() = default;
#endif

  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Array(Array&&) = default;
  EIGEN_DEVICE_FUNC Array& operator=(Array&& other) noexcept(std::is_nothrow_move_assignable<Scalar>::value) {
    Base::operator=(std::move(other));
    return *this;
  }

  template <typename... ArgTypes>
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array(const Scalar& a0, const Scalar& a1, const Scalar& a2, const Scalar& a3,
                                              const ArgTypes&... args)
      : Base(a0, a1, a2, a3, args...) {}

  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Array(
      const std::initializer_list<std::initializer_list<Scalar>>& list)
      : Base(list) {}

#ifndef EIGEN_PARSED_BY_DOXYGEN
  template <typename T>
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit Array(const T& x) {
    Base::template _init1<T>(x);
  }

  template <typename T0, typename T1>
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array(const T0& val0, const T1& val1) {
    this->template _init2<T0, T1>(val0, val1);
  }

#else

  EIGEN_DEVICE_FUNC explicit Array(const Scalar* data);
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit Array(Index dim);
  Array(const Scalar& value);
  Array(Index rows, Index cols);
  Array(const Scalar& val0, const Scalar& val1);
#endif  // end EIGEN_PARSED_BY_DOXYGEN

  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array(const Scalar& val0, const Scalar& val1, const Scalar& val2) {
    EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(Array, 3)
    m_storage.data()[0] = val0;
    m_storage.data()[1] = val1;
    m_storage.data()[2] = val2;
  }
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array(const Scalar& val0, const Scalar& val1, const Scalar& val2,
                                              const Scalar& val3) {
    EIGEN_STATIC_ASSERT_VECTOR_SPECIFIC_SIZE(Array, 4)
    m_storage.data()[0] = val0;
    m_storage.data()[1] = val1;
    m_storage.data()[2] = val2;
    m_storage.data()[3] = val3;
  }

  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE constexpr Array(const Array&) = default;

 private:
  struct PrivateType {};

 public:
  template <typename OtherDerived>
  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Array(
      const EigenBase<OtherDerived>& other,
      std::enable_if_t<internal::is_convertible<typename OtherDerived::Scalar, Scalar>::value, PrivateType> =
          PrivateType())
      : Base(other.derived()) {}

  EIGEN_DEVICE_FUNC constexpr Index innerStride() const noexcept { return 1; }
  EIGEN_DEVICE_FUNC constexpr Index outerStride() const noexcept { return this->innerSize(); }

#ifdef EIGEN_ARRAY_PLUGIN
#include EIGEN_ARRAY_PLUGIN
#endif

 private:
  template <typename MatrixType, typename OtherDerived, bool SwapPointers>
  friend struct internal::matrix_swap_impl;
};

#define EIGEN_MAKE_ARRAY_TYPEDEFS(Type, TypeSuffix, Size, SizeSuffix)        \
                                              \
  typedef Array<Type, Size, Size> Array##SizeSuffix##SizeSuffix##TypeSuffix; \
                                              \
  typedef Array<Type, Size, 1> Array##SizeSuffix##TypeSuffix;

#define EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS(Type, TypeSuffix, Size)  \
                                  \
  typedef Array<Type, Size, Dynamic> Array##Size##X##TypeSuffix; \
                                  \
  typedef Array<Type, Dynamic, Size> Array##X##Size##TypeSuffix;

#define EIGEN_MAKE_ARRAY_TYPEDEFS_ALL_SIZES(Type, TypeSuffix) \
  EIGEN_MAKE_ARRAY_TYPEDEFS(Type, TypeSuffix, 2, 2)           \
  EIGEN_MAKE_ARRAY_TYPEDEFS(Type, TypeSuffix, 3, 3)           \
  EIGEN_MAKE_ARRAY_TYPEDEFS(Type, TypeSuffix, 4, 4)           \
  EIGEN_MAKE_ARRAY_TYPEDEFS(Type, TypeSuffix, Dynamic, X)     \
  EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS(Type, TypeSuffix, 2)        \
  EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS(Type, TypeSuffix, 3)        \
  EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS(Type, TypeSuffix, 4)

EIGEN_MAKE_ARRAY_TYPEDEFS_ALL_SIZES(int, i)
EIGEN_MAKE_ARRAY_TYPEDEFS_ALL_SIZES(float, f)
EIGEN_MAKE_ARRAY_TYPEDEFS_ALL_SIZES(double, d)
EIGEN_MAKE_ARRAY_TYPEDEFS_ALL_SIZES(std::complex<float>, cf)
EIGEN_MAKE_ARRAY_TYPEDEFS_ALL_SIZES(std::complex<double>, cd)

#undef EIGEN_MAKE_ARRAY_TYPEDEFS_ALL_SIZES
#undef EIGEN_MAKE_ARRAY_TYPEDEFS
#undef EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS

#define EIGEN_MAKE_ARRAY_TYPEDEFS(Size, SizeSuffix)              \
                                  \
                                           \
  template <typename Type>                                       \
  using Array##SizeSuffix##SizeSuffix = Array<Type, Size, Size>; \
                                  \
                                           \
  template <typename Type>                                       \
  using Array##SizeSuffix = Array<Type, Size, 1>;

#define EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS(Size)        \
                      \
                               \
  template <typename Type>                           \
  using Array##Size##X = Array<Type, Size, Dynamic>; \
                      \
                               \
  template <typename Type>                           \
  using Array##X##Size = Array<Type, Dynamic, Size>;

EIGEN_MAKE_ARRAY_TYPEDEFS(2, 2)
EIGEN_MAKE_ARRAY_TYPEDEFS(3, 3)
EIGEN_MAKE_ARRAY_TYPEDEFS(4, 4)
EIGEN_MAKE_ARRAY_TYPEDEFS(Dynamic, X)
EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS(2)
EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS(3)
EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS(4)

#undef EIGEN_MAKE_ARRAY_TYPEDEFS
#undef EIGEN_MAKE_ARRAY_FIXED_TYPEDEFS

#define EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE_AND_SIZE(TypeSuffix, SizeSuffix) \
  using Eigen::Matrix##SizeSuffix##TypeSuffix;                               \
  using Eigen::Vector##SizeSuffix##TypeSuffix;                               \
  using Eigen::RowVector##SizeSuffix##TypeSuffix;

#define EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE(TypeSuffix)       \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE_AND_SIZE(TypeSuffix, 2) \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE_AND_SIZE(TypeSuffix, 3) \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE_AND_SIZE(TypeSuffix, 4) \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE_AND_SIZE(TypeSuffix, X)

#define EIGEN_USING_ARRAY_TYPEDEFS        \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE(i)  \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE(f)  \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE(d)  \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE(cf) \
  EIGEN_USING_ARRAY_TYPEDEFS_FOR_TYPE(cd)

}  // end namespace Eigen

#endif  // EIGEN_ARRAY_H