1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_LIBDEXFILE_DEX_DEX_FILE_REFERENCE_H_ 18 #define ART_LIBDEXFILE_DEX_DEX_FILE_REFERENCE_H_ 19 20 #include <cstddef> 21 #include <cstdint> 22 #include <utility> 23 24 namespace art { 25 26 class DexFile; 27 28 class DexFileReference { 29 public: DexFileReference(const DexFile * file,uint32_t idx)30 DexFileReference(const DexFile* file, uint32_t idx) : dex_file(file), index(idx) {} 31 const DexFile* dex_file; 32 uint32_t index; 33 34 struct Comparator { operatorComparator35 bool operator()(const DexFileReference& a, const DexFileReference& b) const { 36 if (a.dex_file != b.dex_file) { 37 return a.dex_file < b.dex_file; 38 } 39 return a.index < b.index; 40 } 41 }; 42 }; 43 44 // Default comparators, compares the indices, not the backing data. 45 inline bool operator<(const DexFileReference& a, const DexFileReference& b) { 46 return DexFileReference::Comparator()(a, b); 47 } 48 inline bool operator==(const DexFileReference& a, const DexFileReference& b) { 49 return a.dex_file == b.dex_file && a.index == b.index; 50 } 51 inline bool operator!=(const DexFileReference& a, const DexFileReference& b) { 52 return !(a == b); 53 } 54 55 } // namespace art 56 57 namespace std { 58 // Hash implementation used for std::set/std::map. Simply xor the hash of the dex-file and index 59 template <> 60 struct hash<art::DexFileReference> { 61 size_t operator()(const art::DexFileReference& ref) const { 62 return hash<decltype(ref.dex_file)>()(ref.dex_file) ^ 63 hash<decltype(ref.index)>()(ref.index); 64 } 65 }; 66 } // namespace std 67 68 #endif // ART_LIBDEXFILE_DEX_DEX_FILE_REFERENCE_H_ 69