Page Speed Optimization Libraries  1.5.27.2
net/instaweb/util/public/atom.h
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00001 /*
00002  * Copyright 2010 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_ATOM_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_ATOM_H_
00021 
00022 #include <set>
00023 #include "net/instaweb/util/public/string.h"
00024 
00025 namespace net_instaweb {
00026 
00027 struct CaseFold;
00028 struct CasePreserve;
00029 template<class CharTransform> class SymbolTable;
00030 
00033 class Atom {
00034  public:
00035   Atom(const Atom& src) : str_(src.str_) {}
00036   Atom();
00037   ~Atom() {}  
00038 
00039   Atom& operator=(const Atom& src) {
00040     if (&src != this) {
00041       str_ = src.str_;
00042     }
00043     return *this;
00044   }
00045 
00047   const char* c_str() const { return str_; }
00048   int size() const { return strlen(str_); }
00049 
00052   bool operator==(const Atom& sym) const {
00053     return str_ == sym.str_;
00054   }
00055 
00058   bool operator!=(const Atom& sym) const {
00059     return str_ != sym.str_;
00060   }
00061 
00065   friend class SymbolTable<CaseFold>;
00066   friend class SymbolTable<CasePreserve>;
00067 
00068  private:
00069   explicit Atom(const char* str) : str_(str) {}
00070   const char* str_;
00071 };
00072 
00075 struct AtomCompare {
00076   bool operator()(const Atom& a1, const Atom& a2) const {
00077     return a1.c_str() < a2.c_str(); 
00078   }
00079 };
00080 
00083 typedef std::set<Atom, AtomCompare> AtomSet;
00084 
00085 }  
00086 
00087 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_ATOM_H_
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