quickcpplib::_xxx::algorithm::small_prng::small_prng Class Reference

From http://burtleburtle.net/bob/rand/smallprng.html, a not awful fast random number source. More...

#include "small_prng.hpp"

Public Types
using	value_type = uint32_t
	The type produced by the small prng.

Public Member Functions
	small_prng (uint32_t seed=0xdeadbeef) noexcept
	Construct an instance with seed
uint32_t	operator() () noexcept
	Return value_type of pseudo-randomness.

Static Protected Member Functions
static uint32_t	rot (uint32_t x, uint32_t k) noexcept

Protected Attributes
uint32_t	a
uint32_t	b
uint32_t	c
uint32_t	d

Detailed Description

From http://burtleburtle.net/bob/rand/smallprng.html, a not awful fast random number source.

Member Typedef Documentation

value_type

using quickcpplib::_xxx::algorithm::small_prng::small_prng::value_type = uint32_t

The type produced by the small prng.

Constructor & Destructor Documentation

small_prng()

quickcpplib::_xxx::algorithm::small_prng::small_prng::small_prng ( uint32_t  seed = 0xdeadbeef )

inlineexplicitnoexcept

Construct an instance with seed

      {
        a = 0xf1ea5eed;
        b = c = d = seed;
        for(size_t i = 0; i < 20; ++i)
          (*this)();
      }

Member Function Documentation

rot()

static uint32_t quickcpplib::_xxx::algorithm::small_prng::small_prng::rot ( uint32_t  x, uint32_t  k  )

inlinestaticprotectednoexcept

{ return (((x) << (k)) | ((x) >> (32 - (k)))); }

operator()()

uint32_t quickcpplib::_xxx::algorithm::small_prng::small_prng::operator() ( )

inlinenoexcept

Return value_type of pseudo-randomness.

      {
        uint32_t e = a - rot(b, 27);
        a = b ^ rot(c, 17);
        b = c + d;
        c = d + e;
        d = e + a;
        return d;
      }

Member Data Documentation

a

uint32_t quickcpplib::_xxx::algorithm::small_prng::small_prng::a

protected

b

uint32_t quickcpplib::_xxx::algorithm::small_prng::small_prng::b

protected

c

uint32_t quickcpplib::_xxx::algorithm::small_prng::small_prng::c

protected

d

uint32_t quickcpplib::_xxx::algorithm::small_prng::small_prng::d

protected

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The documentation for this class was generated from the following file:

• include/quickcpplib/algorithm/small_prng.hpp