Parent

Included Modules

Prime::PseudoPrimeGenerator

An abstract class for enumerating pseudo-prime numbers.

Concrete subclasses should override succ, next, rewind.

Public Class Methods

new(ubound = nil) click to toggle source
# File lib/backports/1.9.1/stdlib/prime.rb, line 228
def initialize(ubound = nil)
  @ubound = ubound
end

Public Instance Methods

each(&block) click to toggle source

Iterates the given block for each prime numbers.

# File lib/backports/1.9.1/stdlib/prime.rb, line 260
def each(&block)
  return self.dup unless block
  if @ubound
    last_value = nil
    loop do
      prime = succ
      break last_value if prime > @ubound
      last_value = block.call(prime)
    end
  else
    loop do
      block.call(succ)
    end
  end
end
next() click to toggle source

alias of succ.

# File lib/backports/1.9.1/stdlib/prime.rb, line 248
def next
  raise NotImplementedError, "need to define `next'"
end
rewind() click to toggle source

Rewinds the internal position for enumeration.

See Enumeratorrewind.

# File lib/backports/1.9.1/stdlib/prime.rb, line 255
def rewind
  raise NotImplementedError, "need to define `rewind'"
end
succ() click to toggle source

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

PseudoPrimeGeneratorsucc raises NotImplementedError.

# File lib/backports/1.9.1/stdlib/prime.rb, line 243
def succ
  raise NotImplementedError, "need to define `succ'"
end
upper_bound() click to toggle source
# File lib/backports/1.9.1/stdlib/prime.rb, line 235
def upper_bound
  @ubound
end
upper_bound=(ubound) click to toggle source
# File lib/backports/1.9.1/stdlib/prime.rb, line 232
def upper_bound=(ubound)
  @ubound = ubound
end
with_object(obj) click to toggle source

see Enumeratorwith_object.

# File lib/backports/1.9.1/stdlib/prime.rb, line 280
def with_object(obj)
  return enum_for(:with_object) unless block_given?
  each do |prime|
    yield prime, obj
  end
end

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