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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/expr.h"
#include "expr_value.h"
#include "expr_builder.h"
#include "util/Assert.h"
using namespace CVC4::expr;
namespace CVC4 {
ExprValue ExprValue::s_null;
Expr Expr::s_null(&ExprValue::s_null);
bool Expr::isNull() const {
return d_ev == &ExprValue::s_null;
}
Expr::Expr() :
d_ev(&ExprValue::s_null) {
// No refcount needed
}
Expr::Expr(ExprValue* ev)
: d_ev(ev) {
Assert(d_ev != NULL, "Expecting a non-NULL evpression value!");
d_ev->inc();
}
Expr::Expr(const Expr& e) {
Assert(e.d_ev != NULL, "Expecting a non-NULL evpression value!");
d_ev = e.d_ev;
d_ev->inc();
}
Expr::~Expr() {
Assert(d_ev != NULL, "Expecting a non-NULL evpression value!");
d_ev->dec();
}
void Expr::assignExprValue(ExprValue* ev) {
d_ev = ev;
d_ev->inc();
}
Expr& Expr::operator=(const Expr& e) {
Assert(d_ev != NULL, "Expecting a non-NULL evpression value!");
if(this != &e && d_ev != e.d_ev) {
d_ev->dec();
d_ev = e.d_ev;
d_ev->inc();
}
return *this;
}
ExprValue const* Expr::operator->() const {
Assert(d_ev != NULL, "Expecting a non-NULL evpression value!");
return d_ev;
}
uint64_t Expr::hash() const {
Assert(d_ev != NULL, "Expecting a non-NULL evpression value!");
return d_ev->hash();
}
Expr Expr::eqExpr(const Expr& right) const {
return ExprManager::currentEM()->mkExpr(EQUAL, *this, right);
}
Expr Expr::notExpr() const {
return ExprManager::currentEM()->mkExpr(NOT, *this);
}
// FIXME: What does this do and why?
Expr Expr::negate() const { // avoid double-negatives
return ExprBuilder(*this).negate();
}
Expr Expr::andExpr(const Expr& right) const {
return ExprManager::currentEM()->mkExpr(AND, *this, right);
}
Expr Expr::orExpr(const Expr& right) const {
return ExprManager::currentEM()->mkExpr(OR, *this, right);
}
Expr Expr::iteExpr(const Expr& thenpart, const Expr& elsepart) const {
return ExprManager::currentEM()->mkExpr(ITE, *this, thenpart, elsepart);
}
Expr Expr::iffExpr(const Expr& right) const {
return ExprManager::currentEM()->mkExpr(IFF, *this, right);
}
Expr Expr::impExpr(const Expr& right) const {
return ExprManager::currentEM()->mkExpr(IMPLIES, *this, right);
}
Expr Expr::xorExpr(const Expr& right) const {
return ExprManager::currentEM()->mkExpr(XOR, *this, right);
}
}/* CVC4 namespace */
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