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/******************************************************************************
* Top contributors (to current version):
* Mudathir Mohamed, Mathias Preiner
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
* in the top-level source directory and their institutional affiliations.
* All rights reserved. See the file COPYING in the top-level source
* directory for licensing information.
* ****************************************************************************
*
* A class for empty bags.
*/
#include "cvc4_public.h"
#ifndef CVC5__EMPTY_BAG_H
#define CVC5__EMPTY_BAG_H
#include <iosfwd>
#include <memory>
namespace cvc5 {
class TypeNode;
class EmptyBag
{
public:
/**
* Constructs an emptybag of the specified type. Note that the argument
* is the type of the bag itself, NOT the type of the elements.
*/
EmptyBag(const TypeNode& bagType);
~EmptyBag();
EmptyBag(const EmptyBag& other);
EmptyBag& operator=(const EmptyBag& other);
const TypeNode& getType() const;
bool operator==(const EmptyBag& es) const;
bool operator!=(const EmptyBag& es) const;
bool operator<(const EmptyBag& es) const;
bool operator<=(const EmptyBag& es) const;
bool operator>(const EmptyBag& es) const;
bool operator>=(const EmptyBag& es) const;
private:
EmptyBag();
/** the type of the empty bag itself (not the type of the elements)*/
std::unique_ptr<TypeNode> d_type;
}; /* class EmptyBag */
std::ostream& operator<<(std::ostream& out, const EmptyBag& es);
struct EmptyBagHashFunction
{
size_t operator()(const EmptyBag& es) const;
}; /* struct EmptyBagHashFunction */
} // namespace cvc5
#endif /* CVC5__EMPTY_BAG_H */
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