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Diffstat (limited to 'src/expr/emptyset.h')
-rw-r--r-- | src/expr/emptyset.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/expr/emptyset.h b/src/expr/emptyset.h new file mode 100644 index 000000000..4b3bb204f --- /dev/null +++ b/src/expr/emptyset.h @@ -0,0 +1,83 @@ +/********************* */ +/*! \file emptyset.h + ** \verbatim + ** Original author: Kshitij Bansal + ** Major contributors: Morgan Deters + ** Minor contributors (to current version): none + ** This file is part of the CVC4 project. + ** Copyright (c) 2009-2014 New York University and The University of Iowa + ** See the file COPYING in the top-level source directory for licensing + ** information.\endverbatim + ** + ** \brief [[ Add one-line brief description here ]] + ** + ** [[ Add lengthier description here ]] + ** \todo document this file + **/ + +#include "cvc4_public.h" + +#pragma once + +namespace CVC4 { + // messy; Expr needs EmptySet (because it's the payload of a + // CONSTANT-kinded expression), and EmptySet needs Expr. + class CVC4_PUBLIC EmptySet; +}/* CVC4 namespace */ + +#include "expr/expr.h" +#include "expr/type.h" +#include <iostream> + +namespace CVC4 { + +class CVC4_PUBLIC EmptySet { + + const SetType d_type; + + EmptySet() { } +public: + + /** + * Constructs an emptyset of the specified type. Note that the argument + * is the type of the set itself, NOT the type of the elements. + */ + EmptySet(SetType setType):d_type(setType) { } + + + ~EmptySet() throw() { + } + + SetType getType() const { return d_type; } + + bool operator==(const EmptySet& es) const throw() { + return d_type == es.d_type; + } + bool operator!=(const EmptySet& es) const throw() { + return !(*this == es); + } + + bool operator<(const EmptySet& es) const throw() { + return d_type < es.d_type; + } + bool operator<=(const EmptySet& es) const throw() { + return d_type <= es.d_type; + } + bool operator>(const EmptySet& es) const throw() { + return !(*this <= es); + } + bool operator>=(const EmptySet& es) const throw() { + return !(*this < es); + } + +};/* class EmptySet */ + +std::ostream& operator<<(std::ostream& out, const EmptySet& es) CVC4_PUBLIC; + +struct CVC4_PUBLIC EmptySetHashFunction { + inline size_t operator()(const EmptySet& es) const { + return TypeHashFunction()(es.getType()); + } +};/* struct EmptySetHashFunction */ + +}/* CVC4 namespace */ |