IndexSet.h

Go to the documentation of this file.

// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2016 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#pragma once
 
#include <vector>
 
#include "MantidKernel/DllConfig.h"
 
namespace Mantid {
namespace Kernel {
 
class MANTID_KERNEL_DLL IndexSet {
public:
  IndexSet(size_t fullRange);
  IndexSet(int64_t min, int64_t max, size_t fullRange);
  IndexSet(const std::vector<size_t> &indices, size_t fullRange);
 
  size_t size() const { return m_size; }
 
  size_t operator[](size_t index) const {
    // This is accessed frequently in loops and thus inlined.
    if (m_isRange)
      return m_min + index;
    return m_indices[index];
  }
 
private:
  bool m_isRange = true;
  // Default here to avoid uninitialized warning for m_isRange = false.
  size_t m_min = 0;
  size_t m_size;
  std::vector<size_t> m_indices;
};
 
} // Namespace Kernel
} // Namespace Mantid