third_party/re2/util/random.h

   1 // Copyright 2005-2009 The RE2 Authors.  All Rights Reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // Modified from Google perftools's tcmalloc_unittest.cc.
   6
   7 #ifndef RE2_UTIL_RANDOM_H__
   8 #define RE2_UTIL_RANDOM_H__
   9
  10 #include "util/util.h"
  11
  12 namespace re2 {
  13
  14 // ACM minimal standard random number generator.  (re-entrant.)
  15 class ACMRandom {
  16  public:
  17   ACMRandom(int32 seed) : seed_(seed) {}
  18   int32 Next();
  19   int32 Uniform(int32);
  20
  21   void Reset(int32 seed) { seed_ = seed; }
  22
  23  private:
  24   int32 seed_;
  25 };
  26
  27 }  // namespace re2
  28
  29 #endif  // RE2_UTIL_RANDOM_H__