set_op.hpp

#pragma once
 
#include <iron_query/virtual_table.hpp>
#include <string>
#include <string_view>
 
namespace iron_query {
 
struct [[nodiscard]] SetOpKind {
  virtual std::string_view ToString() const = 0;
};
 
struct [[nodiscard]] Union final : SetOpKind {
  std::string_view ToString() const override;
};
struct [[nodiscard]] UnionAll final : SetOpKind {
  std::string_view ToString() const override;
};
struct [[nodiscard]] Intersect final : SetOpKind {
  std::string_view ToString() const override;
};
struct [[nodiscard]] Except final : SetOpKind {
  std::string_view ToString() const override;
};
 
class [[nodiscard]] SetOp final : public VirtualTable {
public:
  SetOp(const VirtualTable &a, const VirtualTable &b, const SetOpKind &kind);
 
  std::string ToString() const override;
 
private:
  std::string a_, b_;
  std::string kind_;
};
 
} // namespace iron_query