source: src/RandomNumbers/RandomNumberDistribution.hpp@ 3f9eba

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Last change on this file since 3f9eba was 3f9eba, checked in by Frederik Heber <heber@…>, 14 years ago

New classes for random number generation.

  • we use boost::random as a basis. It implements a lot of pseudo-random engines and various distributions. However, everything is templated and there are no base classes to store prototypes of the instances in a map. We need these such that we are able to offer the user at run-time every choice possible.
  • Hence, we need to encapsulate all engines, distributions and (engine, distribution) tuples: RandomNumber..._Encapsulation classes.
  • each with an abstract base class as the interface: RandomNumber... classes.
  • RandomNumberGeneratorFactory is then a singleton that contains all the Maps and tables:
    • from string (user input is string) to enum (storing enum is more efficient that a lengthy string)
    • from enum to instance (of the abstract class).
  • RandomNumberGeneratorFactory is a singleton to allow for global control of what kind of numbers are generated, hence there are also two new Actions:
  • The user in the end only uses two classes: RandomNumberGeneratorFactory and RandomNumberGenerator. The first only for obtaining a specific variant of the latter and the latter to generate the numbers (operator() is passed on to boost::variate_generator::operator()).
  • There is a unit test on the RandomNumberGeneratorFactory that checks some of the table entries and whether one of the RandomNumberGenerator is working (uniform_smallint so far).

Details:

  • As there are ~25 engines and ~15 distributions this makes an enormous amount of possible combinations. To automatically construct these, we use some stuff from boost::preprocessor in order to generate enums, tables and maps automatically just from a sequence of the typenames.
  • we have be-friended the unit test a lot to allow for easier testing, e.g. we need access to internal ..._type to test whether their type is correct.
  • cleanUp() purges the instance of RandomNumberGeneratorFactory.
  • in RandomNumber..._Encapsulation::name() functions are only used for the unit tests.
  • this all resides in its own subfolder RandomNumbers. So far, it is completely independent of everything else.
  • Property mode set to 100644
File size: 780 bytes
Line 
1/*
2 * RandomNumberDistribution.hpp
3 *
4 * Created on: Jan 01, 2011
5 * Author: heber
6 */
7
8#ifndef RANDOMNUMBERDISTRIBUTION_HPP_
9#define RANDOMNUMBERDISTRIBUTION_HPP_
10
11// include config.h
12#ifdef HAVE_CONFIG_H
13#include <config.h>
14#endif
15
16/** Abstract base class for a random number distribution.
17 *
18 * This class represents the interface to the random number distribution.
19 * Hence, they all can be accessed the same way.
20 *
21 * It is also the base class that is needed for RandomNumberGeneratorFactory.
22 */
23class RandomNumberDistribution
24{
25public:
26 /** Getter for the type name of the internal distribution.
27 *
28 */
29 virtual std::string name()=0;
30
31 RandomNumberDistribution() {};
32 virtual ~RandomNumberDistribution() {};
33
34};
35
36#endif /* RANDOMNUMBERDISTRIBUTION_HPP_ */
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