Class: Prime::PseudoPrimeGenerator

Inherits:

Object

• Object
• Prime::PseudoPrimeGenerator

show all

Includes:

Enumerable

Defined in:

lib/prime.rb

Overview

Instance Method Summary (collapse)

• - (Object) each

  Iterates the given block for each prime numbers.

• - (PseudoPrimeGenerator) initialize(ubound = nil) constructor

  A new instance of PseudoPrimeGenerator.

• - (Object) next

  alias of succ.

• - (Object) rewind

  Rewinds the internal position for enumeration.

• - (Object) succ

  returns the next pseudo-prime number, and move the internal position forward.

• - (Object) upper_bound
• - (Object) upper_bound=(ubound)
• - (Object) with_object(obj)

  see Enumerator#with_object.

Methods included from Enumerable

#to_set

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# File 'lib/prime.rb', line 223

def initialize(ubound = nil)
  @ubound = ubound
end

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# File 'lib/prime.rb', line 255

def each()
  return self.dup unless block_given?
  if @ubound
	last_value = nil
	loop do
	  prime = succ
	  break last_value if prime > @ubound
	  last_value = yield(prime)
	end
  else
	loop do
	  yield(succ)
	end
  end
end

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# File 'lib/prime.rb', line 243

def next
  raise NotImplementedError, "need to define `next'"
end

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# File 'lib/prime.rb', line 250

def rewind
  raise NotImplementedError, "need to define `rewind'"
end

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# File 'lib/prime.rb', line 238

def succ
  raise NotImplementedError, "need to define `succ'"
end

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# File 'lib/prime.rb', line 230

def upper_bound
  @ubound
end

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# File 'lib/prime.rb', line 227

def upper_bound=(ubound)
  @ubound = ubound
end

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# File 'lib/prime.rb', line 275

def with_object(obj)
  return enum_for(:with_object) unless block_given?
  each do |prime|
	yield prime, obj
  end
end