Prime::Generator23

class Prime::Generator23

Parent:Prime::PseudoPrimeGenerator

Generates all integers which are greater than 2 and are not divisible by either 2 or 3.

This is a pseudo-prime generator, suitable on checking primality of an integer by brute force method.

Public Class Methods

new() Show source

Calls superclass method Prime::PseudoPrimeGenerator.new

# File lib/prime.rb, line 348
def initialize
  @prime = 1
  @step = nil
  super
end

Public Instance Methods

next()

Alias for: succ

rewind() Show source

# File lib/prime.rb, line 368
def rewind
  initialize
end

succ() Show source

# File lib/prime.rb, line 354
def succ
  if (@step)
    @prime += @step
    @step = 6 - @step
  else
    case @prime
    when 1; @prime = 2
    when 2; @prime = 3
    when 3; @prime = 5; @step = 2
    end
  end
  @prime
end

Also aliased as: next

 Ruby Core © 1993–2017 Yukihiro Matsumoto

Licensed under the Ruby License.

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Licensed under their own licenses.