1    :  // Copyright 2011 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  
  15    :  #ifndef SYZYGY_CORE_RANDOM_NUMBER_GENERATOR_H_
  16    :  #define SYZYGY_CORE_RANDOM_NUMBER_GENERATOR_H_
  17    :  
  18    :  #include "base/basictypes.h"
  19    :  
  20  m :  namespace core {
  21    :  
  22    :  // This is a linear congruent pseudo random generator.
  23    :  // See: http://en.wikipedia.org/wiki/Linear_congruential_generator.
  24  m :  class RandomNumberGenerator {
  25  m :   public:
  26  m :    explicit RandomNumberGenerator(uint32 seed);
  27    :  
  28    :    // Makes the random number generator callable (with the given modulus).
  29  m :    uint32 operator()(uint32 n);
  30    :  
  31  m :   private:
  32  m :    uint32 seed_;
  33  m :  };
  34    :  
  35  m :  }  // namespace core
  36    :  
  37    :  #endif  // SYZYGY_CORE_RANDOM_NUMBER_GENERATOR_H_