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/********************* */
/*! \file singleton_op.h
** \verbatim
** Top contributors (to current version):
** Mudathir Mohamed
** This file is part of the CVC4 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.\endverbatim
**
** \brief a class for singleton operator for sets
**/
#include "cvc4_public.h"
#ifndef CVC4__SINGLETON_OP_H
#define CVC4__SINGLETON_OP_H
#include <memory>
namespace cvc5 {
class TypeNode;
/**
* The class is an operator for kind SINGLETON used to construct singleton sets.
* It specifies the type of the single element especially when it is a constant.
* e.g. the type of rational 1 is Int, however
* (singleton (singleton_op Real) 1) is of type (Set Real), not (Set Int).
* Note that the type passed to the constructor is the element's type, not the
* set type.
*/
class SingletonOp
{
public:
SingletonOp(const TypeNode& elementType);
SingletonOp(const SingletonOp& op);
/** return the type of the current object */
const TypeNode& getType() const;
bool operator==(const SingletonOp& op) const;
private:
SingletonOp();
/** a pointer to the type of the singleton element */
std::unique_ptr<TypeNode> d_type;
}; /* class Singleton */
std::ostream& operator<<(std::ostream& out, const SingletonOp& op);
/**
* Hash function for the SingletonHashFunction objects.
*/
struct SingletonOpHashFunction
{
size_t operator()(const SingletonOp& op) const;
}; /* struct SingletonOpHashFunction */
} // namespace cvc5
#endif /* CVC4__SINGLETON_OP_H */
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