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/********************* -*- C++ -*- */
/** expr.cpp
** This file is part of the CVC4 prototype.
** Copyright (c) 2009 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.
**
** Reference-counted encapsulation of a pointer to an expression.
**/
#include "expr/node.h"
#include "expr/expr_value.h"
#include "expr/node_builder.h"
#include "util/Assert.h"
#include <sstream>
using namespace CVC4::expr;
using namespace std;
namespace CVC4 {
ExprValue ExprValue::s_null;
Node Node::s_null(&ExprValue::s_null);
Node Node::null() {
return s_null;
}
bool Node::isNull() const {
return d_ev == &ExprValue::s_null;
}
Node::Node() :
d_ev(&ExprValue::s_null) {
// No refcount needed
}
Node::Node(ExprValue* ev)
: d_ev(ev) {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
d_ev->inc();
}
Node::Node(const Node& e) {
Assert(e.d_ev != NULL, "Expecting a non-NULL expression value!");
d_ev = e.d_ev;
d_ev->inc();
}
Node::~Node() {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
d_ev->dec();
}
void Node::assignExprValue(ExprValue* ev) {
d_ev = ev;
d_ev->inc();
}
Node& Node::operator=(const Node& e) {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
if(this != &e && d_ev != e.d_ev) {
d_ev->dec();
d_ev = e.d_ev;
d_ev->inc();
}
return *this;
}
ExprValue const* Node::operator->() const {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
return d_ev;
}
uint64_t Node::hash() const {
Assert(d_ev != NULL, "Expecting a non-NULL expression value!");
return d_ev->hash();
}
Node Node::eqExpr(const Node& right) const {
return NodeManager::currentEM()->mkExpr(EQUAL, *this, right);
}
Node Node::notExpr() const {
return NodeManager::currentEM()->mkExpr(NOT, *this);
}
Node Node::andExpr(const Node& right) const {
return NodeManager::currentEM()->mkExpr(AND, *this, right);
}
Node Node::orExpr(const Node& right) const {
return NodeManager::currentEM()->mkExpr(OR, *this, right);
}
Node Node::iteExpr(const Node& thenpart, const Node& elsepart) const {
return NodeManager::currentEM()->mkExpr(ITE, *this, thenpart, elsepart);
}
Node Node::iffExpr(const Node& right) const {
return NodeManager::currentEM()->mkExpr(IFF, *this, right);
}
Node Node::impExpr(const Node& right) const {
return NodeManager::currentEM()->mkExpr(IMPLIES, *this, right);
}
Node Node::xorExpr(const Node& right) const {
return NodeManager::currentEM()->mkExpr(XOR, *this, right);
}
}/* CVC4 namespace */
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