Page Speed Optimization Libraries
1.5.27.2
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00001 /* 00002 * Copyright 2013 Google Inc. 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http:///www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00018 00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_ENUM_SET_H_ 00020 #define NET_INSTAWEB_UTIL_PUBLIC_ENUM_SET_H_ 00021 00022 #include <bitset> 00023 #include <cstddef> 00024 00025 namespace net_instaweb { 00026 00028 template<typename EnumType, size_t NumEnums> class EnumSet { 00029 public: 00030 bool IsSet(EnumType value) const { 00031 return bits_.test(static_cast<size_t>(value)); 00032 } 00033 00035 bool Insert(EnumType value) { 00036 bool result = !IsSet(value); 00037 insert(value); 00038 return result; 00039 } 00040 00044 void insert(EnumType value) { 00045 bits_.set(static_cast<size_t>(value)); 00046 } 00047 00049 bool Erase(EnumType value) { 00050 bool result = IsSet(value); 00051 bits_.reset(static_cast<size_t>(value)); 00052 return result; 00053 } 00054 00056 bool Merge(const EnumSet& src) { 00060 EnumSet save(*this); 00061 bits_ |= src.bits_; 00062 return bits_ != save.bits_; 00063 } 00064 00067 bool MergeInverted(const EnumSet& src) { 00068 EnumSet save(*this); 00069 bits_ |= ~src.bits_; 00070 return bits_ != save.bits_; 00071 } 00072 00073 void EraseSet(const EnumSet& src) { 00074 bits_ &= ~src.bits_; 00075 } 00076 00078 void SetAll() { 00079 bits_.set(); 00080 } 00081 00083 void clear() { bits_.reset(); } 00084 size_t size() const { return bits_.count(); } 00085 bool empty() const { return bits_.none(); } 00086 00088 bool operator==(const EnumSet& that) const { 00089 return bits_ == that.bits_; 00090 } 00091 00092 private: 00093 typedef std::bitset<NumEnums> BitSet; 00094 BitSet bits_; 00095 00097 }; 00098 00099 } 00100 00101 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_ENUM_SET_H_