class Prime::PseudoPrimeGenerator

Parent:: Object
Included modules:: Enumerable

An abstract class for enumerating pseudo-prime numbers.

Concrete subclasses should override succ, next, rewind.

Public Class Methods

new(ubound = nil) Show source

# File lib/prime.rb, line 243
def initialize(ubound = nil)
  @ubound = ubound
end

Public Instance Methods

each() { |prime| ... } Show source

# File lib/prime.rb, line 275
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

Iterates the given block for each prime number.

next() Show source

# File lib/prime.rb, line 263
def next
  raise NotImplementedError, "need to define `next'"
end

alias of succ.

rewind() Show source

# File lib/prime.rb, line 270
def rewind
  raise NotImplementedError, "need to define `rewind'"
end

Rewinds the internal position for enumeration.

See Enumerator#rewind.

succ() Show source

# File lib/prime.rb, line 258
def succ
  raise NotImplementedError, "need to define `succ'"
end

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

PseudoPrimeGenerator#succ raises NotImplementedError.

upper_bound() Show source

# File lib/prime.rb, line 250
def upper_bound
  @ubound
end

upper_bound=(ubound) Show source

# File lib/prime.rb, line 247
def upper_bound=(ubound)
  @ubound = ubound
end

with_object(obj) { |prime, obj| ... } Show source

# File lib/prime.rb, line 295
def with_object(obj)
  return enum_for(:with_object) unless block_given?
  each do |prime|
    yield prime, obj
  end
end

see Enumerator#with_object.

Ruby Core © 1993–2017 Yukihiro Matsumoto
Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.