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include/AK/Tools/Common/AkSet.h

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00003 released in source code form as part of the SDK installer package.
00004 
00005 Commercial License Usage
00006 
00007 Licensees holding valid commercial licenses to the AUDIOKINETIC Wwise Technology
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00011 
00012 Apache License Usage
00013 
00014 Alternatively, this file may be used under the Apache License, Version 2.0 (the 
00015 "Apache License"); you may not use this file except in compliance with the 
00016 Apache License. You may obtain a copy of the Apache License at 
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00024   Version: <VERSION>  Build: <BUILDNUMBER>
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00027 
00028 //////////////////////////////////////////////////////////////////////
00029 //
00030 // AkSet.h
00031 //
00032 //////////////////////////////////////////////////////////////////////
00033 #ifndef _AKSET_H_
00034 #define _AKSET_H_
00035 
00036 #include <AK/Tools/Common/AkKeyArray.h>
00037 
00038 // AkSetType
00039 //  - An optional set type specifier which is passed into some set operations.  If it is not included, SetType_Inclusion is assumed.
00040 //
00041 enum AkSetType
00042 {
00043     SetType_Inclusion,  // <- An AkSet object with type SetType_Inclusion is a set where each element in the array 
00044                         //      represents an element in the set.  An empty array represents the empty set.
00045     SetType_Exclusion   // <- An AkSet object with type SetType_Exclusion is an 'inverted' set, where each element in the array 
00046                         //      represents and element NOT in the set. An empty array represents the universal set.  
00047 };
00048 
00049 template<typename T>
00050 struct AkSetGetKey{ static AkForceInline T& Get(T& in_item){ return in_item; } };
00051 
00052 // AkSet
00053 //
00054 //  Set container type, implemented as a sorted array of unique items
00055 //
00056 template< typename T, class U_POOL, AkUInt32 uGrowBy = 1 >
00057 class AkSet : public AkSortedKeyArray < T, T, U_POOL, AkSetGetKey<T>, uGrowBy >
00058 {
00059 public:
00060     bool Contains(T in_item) const { return AkSortedKeyArray < T, T, U_POOL, AkSetGetKey<T>, uGrowBy >::Exists(in_item) != NULL; }
00061 };
00062 
00063 // AkDisjoint
00064 //  - Returns true if the intersection of A and B is the empty set.
00065 //
00066 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00067 static bool AkDisjoint(const AkSet<T, U_POOL, uGrowBy>& in_A, const AkSet<T, U_POOL, uGrowBy>& in_B)
00068 {
00069     typename AkSet<T, U_POOL, uGrowBy>::Iterator itA = in_A.Begin();
00070     typename AkSet<T, U_POOL, uGrowBy>::Iterator itB = in_B.Begin();
00071     while (itA != in_A.End() && itB != in_B.End())
00072     {
00073         if (*itA == *itB)
00074             return false;
00075         else if (*itA < *itB)
00076             ++itA;
00077         else
00078             ++itB;
00079     }
00080     return true;
00081 }
00082 
00083 // AkIntersect
00084 //  - Return true if the intersection of A and B is not the empty set.
00085 //
00086 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00087 static bool AkIntersect(const AkSet<T, U_POOL, uGrowBy>& in_A, const AkSet<T, U_POOL, uGrowBy>& in_B)
00088 {
00089     return !AkDisjoint(in_A, in_B);
00090 }
00091 
00092 // AkIsSubset
00093 //  - Return true if in_A is a subset of in_B
00094 //
00095 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00096 static bool AkIsSubset(const AkSet<T, U_POOL, uGrowBy>& in_A, const AkSet<T, U_POOL, uGrowBy>& in_B)
00097 {
00098     typename AkSet<T, U_POOL, uGrowBy>::Iterator itA = in_A.Begin();
00099     typename AkSet<T, U_POOL, uGrowBy>::Iterator itB = in_B.Begin();
00100     while (itA != in_A.End() && itB != in_B.End())
00101     {
00102         if (*itA == *itB)
00103         {
00104             ++itA; ++itB;
00105         }
00106         else if (*itA < *itB)
00107         {
00108             return false;//an element of A is not in B
00109         }
00110         else
00111             ++itB;
00112     }
00113     return (itA == in_A.End());
00114 }
00115 
00116 // AkCountIntersection
00117 //  - Helper function to count the number of elements that are in both in_A and in_B.
00118 //
00119 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00120 static AkUInt32 AkCountIntersection(const AkSet<T, U_POOL, uGrowBy>& in_A, const AkSet<T, U_POOL, uGrowBy>& in_B)
00121 {
00122     AkUInt32 uSize = 0;
00123     typename AkSet<T, U_POOL, uGrowBy>::Iterator itA = in_A.Begin();
00124     typename AkSet<T, U_POOL, uGrowBy>::Iterator itB = in_B.Begin();
00125     while (itA != in_A.End() && itB != in_B.End())
00126     {
00127         if (*itA == *itB)
00128         {
00129             ++uSize; ++itA; ++itB;
00130         }
00131         else if (*itA < *itB)
00132         {
00133             ++itA;
00134         }
00135         else
00136         {
00137             ++itB;
00138         }
00139     }
00140     return uSize;
00141 }
00142 
00143 // AkSubtraction
00144 //  - In-place set subtraction ( A = A - B )
00145 //
00146 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00147 static bool AkSubtraction(AkSet<T, U_POOL, uGrowBy>& in_A, const AkSet<T, U_POOL, uGrowBy>& in_B)
00148 {
00149     typename AkSet<T, U_POOL, uGrowBy>::Iterator itAr, itAw;
00150     itAr = itAw = in_A.Begin();
00151     typename AkSet<T, U_POOL, uGrowBy>::Iterator itB = in_B.Begin();
00152     while (itAr != in_A.End())
00153     {
00154         if (itB == in_B.End() || *itAr < *itB)
00155         {
00156             if (itAw != itAr)
00157                 *itAw = *itAr;
00158 
00159             ++itAw;
00160             ++itAr;
00161         }
00162         else if (*itAr == *itB)
00163         {
00164             ++itB;
00165             ++itAr;
00166         }
00167         else
00168         {
00169             ++itB;
00170         }
00171     }
00172     in_A.Resize((AkUInt32)(itAw.pItem - in_A.Begin().pItem));
00173     return true;
00174 }
00175 
00176 // AkIntersection
00177 //  - In-place set intersection ( A = A n B )
00178 //
00179 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00180 static bool AkIntersection(AkSet<T, U_POOL, uGrowBy>& in_A, const AkSet<T, U_POOL, uGrowBy>& in_B)
00181 {
00182     typename AkSet<T, U_POOL, uGrowBy>::Iterator itAr, itAw;
00183     itAr = itAw = in_A.Begin();
00184     typename AkSet<T, U_POOL, uGrowBy>::Iterator itB = in_B.Begin();
00185     while (itAr != in_A.End() && itB != in_B.End())
00186     {
00187         if (*itAr == *itB)
00188         {
00189             if (itAw != itAr)
00190                 *itAw = *itAr;
00191 
00192             ++itAw;
00193             ++itAr;
00194             ++itB;
00195         }
00196         else if (*itAr < *itB)
00197         {
00198             ++itAr;
00199         }
00200         else
00201         {
00202             ++itB;
00203         }
00204     }
00205     in_A.Resize((AkUInt32)(itAw.pItem - in_A.Begin().pItem));
00206     return true;
00207 }
00208 
00209 // AkUnion
00210 //  - Set union ( A = A U B ).  
00211 //  NOTE: Preforms a memory allocation and may fail.
00212 //
00213 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00214 static bool AkUnion(AkSet<T, U_POOL, uGrowBy>& io_A, const AkSet<T, U_POOL, uGrowBy>& in_B)
00215 {
00216     AkInt32 uSizeNeeded = io_A.Length() + in_B.Length() - AkCountIntersection(io_A, in_B);
00217     AkSet<T, U_POOL, uGrowBy> result;
00218 
00219     if (result.Resize(uSizeNeeded))
00220     {
00221         typename AkSet<T, U_POOL, uGrowBy>::Iterator itRes = result.Begin();
00222         typename AkSet<T, U_POOL, uGrowBy>::Iterator itA = io_A.Begin();
00223         typename AkSet<T, U_POOL, uGrowBy>::Iterator itB = in_B.Begin();
00224 
00225         while (itB != in_B.End() || itA != io_A.End())
00226         {
00227             if ( itB != in_B.End() && (itA == io_A.End() || *itB < *itA))
00228             {
00229                 *itRes = *itB;
00230                 ++itB;
00231             }
00232             else if (itB == in_B.End() || *itA < *itB)
00233             {
00234                 *itRes = *itA;
00235                 ++itA;
00236             }
00237             else //if ( *itA == *itC)
00238             {
00239                 *itRes = *itA;
00240                 ++itA;
00241                 ++itB;
00242             }
00243 
00244             ++itRes;
00245         }
00246 
00247         io_A.Transfer(result);
00248         return true;
00249     }
00250 
00251     return false;
00252 }
00253 
00254 typedef AkSet< AkUniqueID, ArrayPoolDefault >  AkUniqueIDSet;
00255 
00256 // AkIntersect
00257 //  - Return true if the intersection of in_A (a set of type in_typeA), and in_B (a set of type in_typeB) is not the empty set.
00258 //
00259 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00260 static inline bool AkIntersect(const AkSet<T, U_POOL, uGrowBy>& in_A, AkSetType in_typeA, const AkSet<T, U_POOL, uGrowBy>& in_B, AkSetType in_typeB)
00261 {
00262     if (in_typeA == SetType_Inclusion)
00263     {
00264         if (in_typeB == SetType_Inclusion)
00265             return !AkDisjoint(in_A, in_B);
00266         else//(in_typeB == SetType_Exclusion)
00267             return !AkIsSubset(in_A, in_B);
00268     }
00269     else//(in_typeA == SetType_Exclusion)
00270     {
00271         if (in_typeB == SetType_Inclusion)
00272             return !AkIsSubset(in_B, in_A);
00273         else//(in_typeB == SetType_Exclusion)
00274             return true;//Assuming an infinite space of possible elements.
00275     }
00276 }
00277 
00278 // AkContains
00279 //  - Return true if the element in_item is contained in in_Set, a set of type in_type.
00280 //
00281 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00282 static inline bool AkContains(const AkSet<T, U_POOL, uGrowBy>& in_Set, AkSetType in_type, T in_item)
00283 {
00284     return  (in_type == SetType_Inclusion && in_Set.Contains(in_item)) ||
00285         (in_type == SetType_Exclusion && !in_Set.Contains(in_item));
00286 }
00287 
00288 // AkSubtraction
00289 //  - pseudo in-place set subtraction (A = A - B) with set type specifiers.
00290 //  NOTE: Memory may be allocated (in AkUnion) so prepare for failure.
00291 //
00292 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00293 static inline bool AkSubtraction(AkSet<T, U_POOL, uGrowBy>& in_A, AkSetType in_typeA, const AkSet<T, U_POOL, uGrowBy>& in_B, AkSetType in_typeB)
00294 {
00295     if (in_typeA == SetType_Inclusion)
00296     {
00297         if (in_typeB == SetType_Inclusion)
00298             return AkSubtraction(in_A, in_B);
00299         else//(in_typeB == SetType_Exclusion)
00300             return AkIntersection(in_A, in_B);
00301     }
00302     else//(in_typeA == SetType_Exclusion)
00303     {
00304         if (in_typeB == SetType_Inclusion)
00305             return AkUnion(in_A, in_B);
00306         else//(in_typeB == SetType_Exclusion)
00307             return AkIntersection(in_A, in_B);
00308     }
00309 }
00310 
00311 // AkUnion
00312 //  - Pseudo in-place set union (A = A + B)
00313 //  NOTE: Memory may be allocated (in AkUnion) so prepare for failure.
00314 //
00315 template< typename T, class U_POOL, AkUInt32 uGrowBy >
00316 static inline bool AkUnion(AkSet<T, U_POOL, uGrowBy>& io_A, AkSetType& io_typeA, const AkSet<T, U_POOL, uGrowBy>& in_B, AkSetType in_typeB)
00317 {
00318     if (io_typeA == SetType_Inclusion)
00319     {
00320         if (in_typeB == SetType_Inclusion)
00321             return AkUnion(io_A, in_B);
00322         else//(in_typeB == SetType_Exclusion)
00323         {
00324             AkSet<T, U_POOL, uGrowBy> temp;
00325             temp.Transfer(io_A);
00326             if (io_A.Copy(in_B) == AK_Success)
00327             {
00328                 io_typeA = SetType_Exclusion;
00329                 AkSubtraction(io_A, temp);
00330                 temp.Term();
00331                 return true;
00332             }
00333             else
00334             {
00335                 io_A.Transfer(temp);
00336                 return false;
00337             }
00338         }
00339     }
00340     else//(in_typeA == SetType_Exclusion)
00341     {
00342         if (in_typeB == SetType_Inclusion)
00343             return AkSubtraction(io_A, in_B);
00344         else//(in_typeB == SetType_Exclusion)
00345             return AkIntersection(io_A, in_B);
00346     }
00347 }
00348 
00349 #endif
00350 

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