Eigen/src/Core/util/ReshapedHelper.h

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2017 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_RESHAPED_HELPER_H
#define EIGEN_RESHAPED_HELPER_H

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

namespace Eigen {

enum AutoSize_t { AutoSize };
const int AutoOrder = 2;

namespace internal {

template <typename SizeType, typename OtherSize, int TotalSize>
struct get_compiletime_reshape_size {
  enum { value = get_fixed_value<SizeType>::value };
};

template <typename SizeType>
Index get_runtime_reshape_size(SizeType size, Index /*other*/, Index /*total*/) {
  return internal::get_runtime_value(size);
}

template <typename OtherSize, int TotalSize>
struct get_compiletime_reshape_size<AutoSize_t, OtherSize, TotalSize> {
  enum {
    other_size = get_fixed_value<OtherSize>::value,
    value = (TotalSize == Dynamic || other_size == Dynamic) ? Dynamic : TotalSize / other_size
  };
};

inline Index get_runtime_reshape_size(AutoSize_t /*size*/, Index other, Index total) { return total / other; }

constexpr inline int get_compiletime_reshape_order(int flags, int order) {
  return order == AutoOrder ? flags & RowMajorBit : order;
}

}  // namespace internal

}  // end namespace Eigen

#endif  // EIGEN_RESHAPED_HELPER_H