Random::Implementation

Implementation corresponding to the actual Random class of Ruby The actual random generator (mersenne twister) is in MT19937. Ruby specific conversions are handled in bits_and_bytes. The high level stuff (argument checking) is done here.

Attributes

seed[R]

Public Class Methods

new(seed = 0) click to toggle source
# File lib/backports/extra/random/implementation.rb, line 10
def initialize(seed = 0)
  super()
  srand(seed)
end

Public Instance Methods

==(other) click to toggle source
# File lib/backports/extra/random/implementation.rb, line 42
def ==(other)
  other.is_a?(Random) &&
    seed == other.seed &&
    left == other.send(:left) &&
    state == other.send(:state)
end
bytes(nb) click to toggle source
# File lib/backports/extra/random/implementation.rb, line 36
def bytes(nb)
  nb = Backports.coerce_to_int(nb)
  raise ArgumentError, "negative size" if nb < 0
  @mt.random_bytes(nb)
end
marshal_dump() click to toggle source
# File lib/backports/extra/random/implementation.rb, line 49
def marshal_dump
  @mt.marshal_dump << @seed
end
marshal_load(ary) click to toggle source
# File lib/backports/extra/random/implementation.rb, line 53
def marshal_load(ary)
  @seed = ary.pop
  @mt = MT19937.allocate
  @mt.marshal_load(ary)
end
rand(limit = Backports::Undefined) click to toggle source
# File lib/backports/extra/random/implementation.rb, line 22
def rand(limit = Backports::Undefined)
  case limit
    when Backports::Undefined
      @mt.random_float
    when Float
      limit * @mt.random_float unless limit <= 0
    when Range
      _rand_range(limit)
    else
      limit = Backports.coerce_to_int(limit)
      @mt.random_integer(limit) unless limit <= 0
  end || raise(ArgumentError, "invalid argument #{limit}")
end
srand(new_seed = 0) click to toggle source
# File lib/backports/extra/random/implementation.rb, line 15
def srand(new_seed = 0)
  new_seed = Backports.coerce_to_int(new_seed)
  old, @seed = @seed, new_seed.nonzero? || Random.new_seed
  @mt = MT19937[ @seed ]
  old
end

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