dataset.hpp

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#pragma once
 
#include <cstddef>
#include <optional>
 
#include <cpp-toolbox/cpp-toolbox_export.hpp>
 
namespace toolbox::io
{
 
template<typename Derived, typename DataType>
class CPP_TOOLBOX_EXPORT dataset_t
{
public:
  using data_type = DataType;
 
  std::size_t size() const
  {
    return static_cast<const Derived*>(this)->size_impl();
  }
 
  std::optional<DataType> operator[](std::size_t index) const
  {
    return static_cast<const Derived*>(this)->at_impl(index);
  }
 
  std::optional<DataType> at(std::size_t index) const
  {
    return static_cast<const Derived*>(this)->at_impl(index);
  }
 
  std::optional<DataType> get_item(std::size_t index) const
  {
    return static_cast<const Derived*>(this)->at_impl(index);
  }
 
  std::optional<DataType> get_next()
  {
    return static_cast<const Derived*>(this)->at_impl(m_current_index++);
  }
 
  std::optional<DataType> peek_next() const
  {
    return static_cast<const Derived*>(this)->at_impl(m_current_index);
  }
 
  void reset_iterator() { m_current_index = 0; }
 
  std::size_t current_index() const { return m_current_index; }
 
protected:
  dataset_t() = default;
  ~dataset_t() = default;
 
public:
  dataset_t(const dataset_t&) = delete;
  dataset_t& operator=(const dataset_t&) = delete;
  dataset_t(dataset_t&&) = delete;
  dataset_t& operator=(dataset_t&&) = delete;
 
private:
  std::size_t m_current_index = 0;
};
 
}  // namespace toolbox::io