#ifndef LLVM_ADT_ILIST_NODE_H
#define LLVM_ADT_ILIST_NODE_H
-#include "llvm/Config/config.h"
-
namespace llvm {
template<typename NodeTy>
NodeTy *getPrev() { return Prev; }
const NodeTy *getPrev() const { return Prev; }
void setPrev(NodeTy *P) { Prev = P; }
- ilist_half_node() : Prev(0) {}
+ ilist_half_node() : Prev(nullptr) {}
};
template<typename NodeTy>
/// that use ilist_nextprev_traits or ilist_default_traits.
///
template<typename NodeTy>
-class ilist_node : ilist_half_node<NodeTy> {
+class ilist_node : private ilist_half_node<NodeTy> {
friend struct ilist_nextprev_traits<NodeTy>;
friend struct ilist_traits<NodeTy>;
NodeTy *Next;
const NodeTy *getNext() const { return Next; }
void setNext(NodeTy *N) { Next = N; }
protected:
- ilist_node() : Next(0) {}
-};
+ ilist_node() : Next(nullptr) {}
-/// 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
+public:
+ /// @name Adjacent Node Accessors
+ /// @{
+
+ /// \brief Get the previous node, or 0 for the list head.
+ NodeTy *getPrevNode() {
+ NodeTy *Prev = this->getPrev();
+
+ // Check for sentinel.
+ if (!Prev->getNext())
+ return nullptr;
+
+ return Prev;
+ }
+
+ /// \brief Get the previous node, or 0 for the list head.
+ const NodeTy *getPrevNode() const {
+ const NodeTy *Prev = this->getPrev();
+
+ // Check for sentinel.
+ if (!Prev->getNext())
+ return nullptr;
+
+ return Prev;
+ }
+
+ /// \brief Get the next node, or 0 for the list tail.
+ NodeTy *getNextNode() {
+ NodeTy *Next = getNext();
+
+ // Check for sentinel.
+ if (!Next->getNext())
+ return nullptr;
+
+ return Next;
+ }
+
+ /// \brief Get the next node, or 0 for the list tail.
+ const NodeTy *getNextNode() const {
+ const NodeTy *Next = getNext();
+
+ // Check for sentinel.
+ if (!Next->getNext())
+ return nullptr;
+
+ return Next;
+ }
+
+ /// @}
+};
} // End llvm namespace