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+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+/**
+ * Contains source code from the article "Radix Sort Revisited".
+ * \file IceRevisitedRadix.h
+ * \author Pierre Terdiman
+ * \date April, 4, 2000
+ */
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Include Guard
+#ifndef __ICERADIXSORT_H__
+#define __ICERADIXSORT_H__
+
+ //! Allocate histograms & offsets locally
+ #define RADIX_LOCAL_RAM
+
+ enum RadixHint
+ {
+ RADIX_SIGNED, //!< Input values are signed
+ RADIX_UNSIGNED, //!< Input values are unsigned
+
+ RADIX_FORCE_DWORD = 0x7fffffff
+ };
+
+ class ICECORE_API RadixSort
+ {
+ public:
+ // Constructor/Destructor
+ RadixSort();
+ ~RadixSort();
+ // Sorting methods
+ RadixSort& Sort(const udword* input, udword nb, RadixHint hint=RADIX_SIGNED);
+ RadixSort& Sort(const float* input, udword nb);
+
+ //! Access to results. mRanks is a list of indices in sorted order, i.e. in the order you may further process your data
+ inline_ const udword* GetRanks() const { return mRanks; }
+
+ //! mIndices2 gets trashed on calling the sort routine, but otherwise you can recycle it the way you want.
+ inline_ udword* GetRecyclable() const { return mRanks2; }
+
+ // Stats
+ udword GetUsedRam() const;
+ //! Returns the total number of calls to the radix sorter.
+ inline_ udword GetNbTotalCalls() const { return mTotalCalls; }
+ //! Returns the number of eraly exits due to temporal coherence.
+ inline_ udword GetNbHits() const { return mNbHits; }
+
+ private:
+#ifndef RADIX_LOCAL_RAM
+ udword* mHistogram; //!< Counters for each byte
+ udword* mOffset; //!< Offsets (nearly a cumulative distribution function)
+#endif
+ udword mCurrentSize; //!< Current size of the indices list
+ udword* mRanks; //!< Two lists, swapped each pass
+ udword* mRanks2;
+ // Stats
+ udword mTotalCalls; //!< Total number of calls to the sort routine
+ udword mNbHits; //!< Number of early exits due to coherence
+ // Internal methods
+ void CheckResize(udword nb);
+ bool Resize(udword nb);
+ };
+
+#endif // __ICERADIXSORT_H__