Class: Prime8::Generators::PrimeGenerator

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/prime_8/generators/prime_generator.rb

Direct Known Subclasses

AtkinsGenerator, EratosthenesGenerator

Instance Method Summary collapse

Constructor Details

#initialize(ubound = nil) ⇒ PrimeGenerator

Returns a new instance of PrimeGenerator.



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# File 'lib/prime_8/generators/prime_generator.rb', line 4

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

Instance Method Details

#each ⇒ Object 



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# File 'lib/prime_8/generators/prime_generator.rb', line 28

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

#next ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/prime_8/generators/prime_generator.rb', line 20

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

#rewind ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/prime_8/generators/prime_generator.rb', line 24

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

#succ ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/prime_8/generators/prime_generator.rb', line 16

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

#upper_bound ⇒ Object 



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# File 'lib/prime_8/generators/prime_generator.rb', line 12

def upper_bound
  @ubound
end

#upper_bound=(ubound) ⇒ Object 



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# File 'lib/prime_8/generators/prime_generator.rb', line 8

def upper_bound=(ubound)
  @ubound = ubound
end

#with_object(obj) ⇒ Object 



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# File 'lib/prime_8/generators/prime_generator.rb', line 46

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