column.h

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#pragma once
#include <any>
#include <string>
#include <typeinfo>
 
#include "visitor.h"
 
namespace hgps::core {
 
class DataTableColumn {
  public:
    DataTableColumn() = default;
 
    DataTableColumn(const DataTableColumn &) = delete;
    DataTableColumn &operator=(const DataTableColumn &) = delete;
 
    DataTableColumn(DataTableColumn &&) = delete;
    DataTableColumn &operator=(DataTableColumn &&) = delete;
 
    virtual ~DataTableColumn() = default;
 
    virtual std::string type() const noexcept = 0;
 
    virtual std::string name() const noexcept = 0;
 
    virtual std::size_t null_count() const noexcept = 0;
 
    virtual std::size_t size() const noexcept = 0;
 
    virtual bool is_null(std::size_t index) const noexcept = 0;
 
    virtual bool is_valid(std::size_t index) const noexcept = 0;
 
    virtual const std::any value(std::size_t index) const noexcept = 0;
 
    virtual void accept(DataTableColumnVisitor &visitor) const = 0;
};
} // namespace hgps::core