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//==-- llvm/ADT/ilist_node.h - Intrusive Linked List Helper ------*- C++ -*-==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the ilist_node class template, which is a convenient
// base class for creating classes that can be used with ilists.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ADT_ILIST_NODE_H
#define LLVM_ADT_ILIST_NODE_H
#include "llvm/Config/config.h"
namespace llvm {
template<typename NodeTy>
struct ilist_traits;
/// ilist_half_node - Base class that provides prev services for sentinels.
///
template<typename NodeTy>
class ilist_half_node {
friend struct ilist_traits<NodeTy>;
NodeTy *Prev;
protected:
NodeTy *getPrev() { return Prev; }
const NodeTy *getPrev() const { return Prev; }
void setPrev(NodeTy *P) { Prev = P; }
ilist_half_node() : Prev(0) {}
};
template<typename NodeTy>
struct ilist_nextprev_traits;
/// ilist_node - Base class that provides next/prev services for nodes
/// that use ilist_nextprev_traits or ilist_default_traits.
///
template<typename NodeTy>
class ilist_node : ilist_half_node<NodeTy> {
friend struct ilist_nextprev_traits<NodeTy>;
friend struct ilist_traits<NodeTy>;
NodeTy *Next;
NodeTy *getNext() { return Next; }
const NodeTy *getNext() const { return Next; }
void setNext(NodeTy *N) { Next = N; }
protected:
ilist_node() : Next(0) {}
};
/// When assertions are off, the Next field of sentinels
/// will not be accessed. So it is not necessary to allocate
/// space for it. The following macro selects the most
/// efficient traits class. The LLVM_COMPACT_SENTINELS
/// configuration variable controls this.
///
#if defined(LLVM_COMPACT_SENTINELS) && LLVM_COMPACT_SENTINELS
# define ILIST_NODE ilist_half_node
#else
# define ILIST_NODE ilist_node
#endif
} // End llvm namespace
#endif
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