Class: Prime::PseudoPrimeGenerator
- Inherits:
-
Object
- Object
- Prime::PseudoPrimeGenerator
- Includes:
- Enumerable
- Defined in:
- lib/prime.rb
Overview
An abstract class for enumerating pseudo-prime numbers.
Concrete subclasses should override succ, next, rewind.
Direct Known Subclasses
Instance Method Summary collapse
-
#each ⇒ Object
Iterates the given block for each prime number.
-
#initialize(ubound = nil) ⇒ PseudoPrimeGenerator
constructor
A new instance of PseudoPrimeGenerator.
-
#next ⇒ Object
alias of
succ
. -
#rewind ⇒ Object
Rewinds the internal position for enumeration.
-
#succ ⇒ Object
returns the next pseudo-prime number, and move the internal position forward.
- #upper_bound ⇒ Object
- #upper_bound=(ubound) ⇒ Object
-
#with_object(obj) ⇒ Object
see
Enumerator
#with_object.
Constructor Details
#initialize(ubound = nil) ⇒ PseudoPrimeGenerator
Returns a new instance of PseudoPrimeGenerator.
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# File 'lib/prime.rb', line 243 def initialize(ubound = nil) @ubound = ubound end |
Instance Method Details
#each ⇒ Object
Iterates the given block for each prime number.
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# 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 |
#next ⇒ Object
alias of succ
.
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# File 'lib/prime.rb', line 263 def next raise NotImplementedError, "need to define `next'" end |
#rewind ⇒ Object
Rewinds the internal position for enumeration.
See Enumerator
#rewind.
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# File 'lib/prime.rb', line 270 def rewind raise NotImplementedError, "need to define `rewind'" end |
#succ ⇒ Object
returns the next pseudo-prime number, and move the internal position forward.
PseudoPrimeGenerator
#succ raises NotImplementedError
.
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# File 'lib/prime.rb', line 258 def succ raise NotImplementedError, "need to define `succ'" end |
#upper_bound ⇒ Object
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# File 'lib/prime.rb', line 250 def upper_bound @ubound end |
#upper_bound=(ubound) ⇒ Object
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# File 'lib/prime.rb', line 247 def upper_bound=(ubound) @ubound = ubound end |
#with_object(obj) ⇒ Object
see Enumerator
#with_object.
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# 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 |