[833] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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[1340] | 27 | // $Id: G4Allocator.hh,v 1.21 2010/04/01 12:43:12 gcosmo Exp $ |
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| 28 | // GEANT4 tag $Name: global-V09-03-22 $ |
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[833] | 29 | // |
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| 30 | // |
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| 31 | // ------------------------------------------------------------ |
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| 32 | // GEANT 4 class header file |
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| 33 | // |
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| 34 | // Class Description: |
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| 35 | // |
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| 36 | // A class for fast allocation of objects to the heap through a pool of |
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| 37 | // chunks organised as linked list. It's meant to be used by associating |
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| 38 | // it to the object to be allocated and defining for it new and delete |
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| 39 | // operators via MallocSingle() and FreeSingle() methods. |
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| 40 | |
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| 41 | // ---------------- G4Allocator ---------------- |
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| 42 | // |
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| 43 | // Author: G.Cosmo (CERN), November 2000 |
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| 44 | // ------------------------------------------------------------ |
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| 45 | |
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| 46 | #ifndef G4Allocator_h |
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| 47 | #define G4Allocator_h 1 |
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| 48 | |
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| 49 | #include <cstddef> |
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| 50 | |
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| 51 | #include "G4AllocatorPool.hh" |
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| 52 | |
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| 53 | template <class Type> |
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| 54 | class G4Allocator |
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| 55 | { |
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| 56 | public: // with description |
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| 57 | |
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| 58 | G4Allocator() throw(); |
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| 59 | ~G4Allocator() throw(); |
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| 60 | // Constructor & destructor |
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| 61 | |
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| 62 | inline Type* MallocSingle(); |
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| 63 | inline void FreeSingle(Type* anElement); |
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| 64 | // Malloc and Free methods to be used when overloading |
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| 65 | // new and delete operators in the client <Type> object |
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| 66 | |
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| 67 | inline void ResetStorage(); |
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[1340] | 68 | // Returns allocated storage to the free store, resets allocator. |
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[833] | 69 | // Note: contents in memory are lost using this call ! |
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| 70 | |
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| 71 | inline size_t GetAllocatedSize() const; |
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| 72 | // Returns the size of the total memory allocated |
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[1340] | 73 | inline int GetNoPages() const; |
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| 74 | // Returns the total number of allocated pages |
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| 75 | inline size_t GetPageSize() const; |
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| 76 | // Returns the current size of a page |
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| 77 | inline void IncreasePageSize( unsigned int sz ); |
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| 78 | // Resets allocator and increases default page size of a given factor |
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[833] | 79 | |
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| 80 | public: // without description |
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| 81 | |
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| 82 | // This public section includes standard methods and types |
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| 83 | // required if the allocator is to be used as alternative |
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| 84 | // allocator for STL containers. |
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| 85 | // NOTE: the code below is a trivial implementation to make |
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| 86 | // this class an STL compliant allocator. |
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| 87 | // It is anyhow NOT recommended to use this class as |
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| 88 | // alternative allocator for STL containers ! |
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| 89 | |
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| 90 | typedef Type value_type; |
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| 91 | typedef size_t size_type; |
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| 92 | typedef ptrdiff_t difference_type; |
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| 93 | typedef Type* pointer; |
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| 94 | typedef const Type* const_pointer; |
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| 95 | typedef Type& reference; |
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| 96 | typedef const Type& const_reference; |
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| 97 | |
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| 98 | template <class U> G4Allocator(const G4Allocator<U>& right) throw() |
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| 99 | : mem(right.mem) {} |
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| 100 | // Copy constructor |
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| 101 | |
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| 102 | pointer address(reference r) const { return &r; } |
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| 103 | const_pointer address(const_reference r) const { return &r; } |
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| 104 | // Returns the address of values |
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| 105 | |
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[1193] | 106 | pointer allocate(size_type n, void* = 0) |
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[833] | 107 | { |
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| 108 | // Allocates space for n elements of type Type, but does not initialise |
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| 109 | // |
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| 110 | Type* mem_alloc = 0; |
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| 111 | if (n == 1) |
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| 112 | mem_alloc = MallocSingle(); |
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| 113 | else |
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| 114 | mem_alloc = static_cast<Type*>(::operator new(n*sizeof(Type))); |
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| 115 | return mem_alloc; |
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| 116 | } |
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| 117 | void deallocate(pointer p, size_type n) |
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| 118 | { |
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| 119 | // Deallocates n elements of type Type, but doesn't destroy |
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| 120 | // |
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| 121 | if (n == 1) |
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| 122 | FreeSingle(p); |
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| 123 | else |
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| 124 | ::operator delete((void*)p); |
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| 125 | return; |
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| 126 | } |
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| 127 | |
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| 128 | void construct(pointer p, const Type& val) { new((void*)p) Type(val); } |
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| 129 | // Initialises *p by val |
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| 130 | void destroy(pointer p) { p->~Type(); } |
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| 131 | // Destroy *p but doesn't deallocate |
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| 132 | |
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| 133 | size_type max_size() const throw() |
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| 134 | { |
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| 135 | // Returns the maximum number of elements that can be allocated |
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| 136 | // |
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| 137 | return 2147483647/sizeof(Type); |
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| 138 | } |
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| 139 | |
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| 140 | template <class U> |
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| 141 | struct rebind { typedef G4Allocator<U> other; }; |
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| 142 | // Rebind allocator to type U |
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| 143 | |
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| 144 | G4AllocatorPool mem; |
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| 145 | // Pool of elements of sizeof(Type) |
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| 146 | }; |
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| 147 | |
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| 148 | // ------------------------------------------------------------ |
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| 149 | // Inline implementation |
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| 150 | // ------------------------------------------------------------ |
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| 151 | |
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| 152 | // Initialization of the static pool |
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| 153 | // |
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| 154 | // template <class Type> G4AllocatorPool G4Allocator<Type>::mem(sizeof(Type)); |
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| 155 | |
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| 156 | // ************************************************************ |
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| 157 | // G4Allocator constructor |
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| 158 | // ************************************************************ |
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| 159 | // |
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| 160 | template <class Type> |
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| 161 | G4Allocator<Type>::G4Allocator() throw() |
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| 162 | : mem(sizeof(Type)) |
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| 163 | { |
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| 164 | } |
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| 165 | |
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| 166 | // ************************************************************ |
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| 167 | // G4Allocator destructor |
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| 168 | // ************************************************************ |
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| 169 | // |
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| 170 | template <class Type> |
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| 171 | G4Allocator<Type>::~G4Allocator() throw() |
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| 172 | { |
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| 173 | } |
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| 174 | |
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| 175 | // ************************************************************ |
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| 176 | // MallocSingle |
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| 177 | // ************************************************************ |
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| 178 | // |
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| 179 | template <class Type> |
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| 180 | Type* G4Allocator<Type>::MallocSingle() |
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| 181 | { |
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| 182 | return static_cast<Type*>(mem.Alloc()); |
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| 183 | } |
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| 184 | |
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| 185 | // ************************************************************ |
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| 186 | // FreeSingle |
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| 187 | // ************************************************************ |
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| 188 | // |
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| 189 | template <class Type> |
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| 190 | void G4Allocator<Type>::FreeSingle(Type* anElement) |
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| 191 | { |
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| 192 | mem.Free(anElement); |
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| 193 | return; |
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| 194 | } |
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| 195 | |
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| 196 | // ************************************************************ |
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| 197 | // ResetStorage |
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| 198 | // ************************************************************ |
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| 199 | // |
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| 200 | template <class Type> |
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| 201 | void G4Allocator<Type>::ResetStorage() |
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| 202 | { |
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| 203 | // Clear all allocated storage and return it to the free store |
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| 204 | // |
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| 205 | mem.Reset(); |
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| 206 | return; |
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| 207 | } |
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| 208 | |
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| 209 | // ************************************************************ |
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| 210 | // GetAllocatedSize |
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| 211 | // ************************************************************ |
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| 212 | // |
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| 213 | template <class Type> |
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| 214 | size_t G4Allocator<Type>::GetAllocatedSize() const |
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| 215 | { |
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| 216 | return mem.Size(); |
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| 217 | } |
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| 218 | |
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| 219 | // ************************************************************ |
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[1340] | 220 | // GetNoPages |
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| 221 | // ************************************************************ |
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| 222 | // |
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| 223 | template <class Type> |
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| 224 | int G4Allocator<Type>::GetNoPages() const |
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| 225 | { |
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| 226 | return mem.GetNoPages(); |
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| 227 | } |
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| 228 | |
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| 229 | // ************************************************************ |
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| 230 | // GetPageSize |
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| 231 | // ************************************************************ |
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| 232 | // |
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| 233 | template <class Type> |
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| 234 | size_t G4Allocator<Type>::GetPageSize() const |
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| 235 | { |
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| 236 | return mem.GetPageSize(); |
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| 237 | } |
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| 238 | |
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| 239 | // ************************************************************ |
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| 240 | // IncreasePageSize |
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| 241 | // ************************************************************ |
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| 242 | // |
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| 243 | template <class Type> |
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| 244 | void G4Allocator<Type>::IncreasePageSize( unsigned int sz ) |
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| 245 | { |
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| 246 | ResetStorage(); |
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| 247 | mem.GrowPageSize(sz); |
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| 248 | } |
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| 249 | |
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| 250 | // ************************************************************ |
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[833] | 251 | // operator== |
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| 252 | // ************************************************************ |
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| 253 | // |
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| 254 | template <class T1, class T2> |
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| 255 | bool operator== (const G4Allocator<T1>&, const G4Allocator<T2>&) throw() |
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| 256 | { |
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| 257 | return true; |
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| 258 | } |
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| 259 | |
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| 260 | // ************************************************************ |
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| 261 | // operator!= |
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| 262 | // ************************************************************ |
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| 263 | // |
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| 264 | template <class T1, class T2> |
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| 265 | bool operator!= (const G4Allocator<T1>&, const G4Allocator<T2>&) throw() |
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| 266 | { |
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| 267 | return false; |
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| 268 | } |
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| 269 | |
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| 270 | #endif |
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