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/*
* expr_manager_scope.h
*
* Created on: Apr 7, 2010
* Author: dejan
*/
#ifndef __CVC4__EXPR_MANAGER_SCOPE_H
#define __CVC4__EXPR_MANAGER_SCOPE_H
#include "expr/expr.h"
#include "expr/node_manager.h"
namespace CVC4 {
/**
* Creates a <code>NodeManagerScope</code> with the underlying
* <code>NodeManager</code> of a given <code>Expr</code> or
* <code>ExprManager</code>. The <code>NodeManagerScope</code> is
* destroyed when the <code>ExprManagerScope</code> is destroyed. See
* <code>NodeManagerScope</code> for more information.
*/
// NOTE: Here, it seems ExprManagerScope is redundant, since we have
// NodeManagerScope already. However, without this class, we'd need
// Expr to be a friend of ExprManager, because in the implementation
// of Expr functions, it needs to set the current NodeManager
// correctly (and to do that it needs access to
// ExprManager::getNodeManager()). So, we make ExprManagerScope a
// friend of ExprManager's, since its implementation is simple to
// read and understand (and verify that it doesn't do any mischief).
//
// ExprManager::getNodeManager() can't just be made public, since
// ExprManager is exposed to clients of the library and NodeManager is
// not. Similarly, ExprManagerScope shouldn't go in expr_manager.h,
// since that's a public header.
class ExprManagerScope {
NodeManagerScope d_nms;
public:
inline ExprManagerScope(const Expr& e) :
d_nms(e.getExprManager() == NULL
? NodeManager::currentNM()
: e.getExprManager()->getNodeManager()) {
}
inline ExprManagerScope(const ExprManager& exprManager) :
d_nms(exprManager.getNodeManager()) {
}
};
}
#endif /* __CVC4__EXPR_MANAGER_SCOPE_H */
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