src/util/hash.h

   1 /*********************                                                        */
   2 /*! \file hash.h
   3  ** \verbatim
   4  ** Original author: cconway
   5  ** Major contributors: mdeters
   6  ** Minor contributors (to current version): taking
   7  ** This file is part of the CVC4 prototype.
   8  ** Copyright (c) 2009, 2010, 2011  The Analysis of Computer Systems Group (ACSys)
   9  ** Courant Institute of Mathematical Sciences
  10  ** New York University
  11  ** See the file COPYING in the top-level source directory for licensing
  12  ** information.\endverbatim
  13  **
  14  ** \brief [[ Add one-line brief description here ]]
  15  **
  16  ** [[ Add lengthier description here ]]
  17  ** \todo document this file
  18  **/
  19
  20 #include "cvc4_public.h"
  21
  22 #ifndef __CVC4__HASH_H
  23 #define __CVC4__HASH_H
  24
  25 // in case it's not been declared as a namespace yet
  26 namespace __gnu_cxx {}
  27
  28 #include <ext/hash_map>
  29
  30 namespace __gnu_cxx {
  31
  32 #ifdef CVC4_NEED_HASH_UINT64_T
  33 // on some versions and architectures of GNU C++, we need a
  34 // specialization of hash for 64-bit values
  35 template <>
  36 struct hash<uint64_t> {
  37   size_t operator()(uint64_t v) const {
  38     return v;
  39   }
  40 };/* struct hash<uint64_t> */
  41 #endif /* CVC4_NEED_HASH_UINT64_T */
  42
  43 }/* __gnu_cxx namespace */
  44
  45 // hackish: treat hash stuff as if it were in std namespace
  46 namespace std { using namespace __gnu_cxx; }
  47
  48 namespace CVC4 {
  49
  50 struct StringHashFunction {
  51   size_t operator()(const std::string& str) const {
  52     return std::hash<const char*>()(str.c_str());
  53   }
  54 };/* struct StringHashFunction */
  55
  56 struct StringHashStrategy {
  57   static size_t hash(const std::string& str) {
  58     return std::hash<const char*>()(str.c_str());
  59   }
  60 };/* struct StringHashStrategy */
  61
  62 }/* CVC4 namespace */
  63
  64 #endif /* __CVC4__HASH_H */