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* lib/prime.rb: Return sized enumerators.

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Patch by Kenichi Kamiya [GH-931]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50857 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
marcandre 2015-06-12 15:45:59 +00:00
parent 5b78e48c31
commit b28f3e5c4f
3 changed files with 18 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Sat Jun 13 00:45:08 2015 Marc-Andre Lafortune <ruby-core@marc-andre.ca>
* lib/prime.rb: Return sized enumerators.
Patch by Kenichi Kamiya [GH-931]
Sat Jun 13 00:45:06 2015 Marc-Andre Lafortune <ruby-core@marc-andre.ca>
* lib/prime.rb: Fix with_object with no block given

8
lib/prime.rb
View file

@ -270,7 +270,7 @@ class Prime
# see +Enumerator+#with_index.
def with_index(offset = 0)
return enum_for(:with_index, offset) unless block_given?
return enum_for(:with_index, offset) { Float::INFINITY } unless block_given?
return each_with_index(&proc) if offset == 0
each do |prime|
@ -281,11 +281,15 @@ class Prime
# see +Enumerator+#with_object.
def with_object(obj)
return enum_for(:with_object, obj) unless block_given?
return enum_for(:with_object, obj) { Float::INFINITY } unless block_given?
each do |prime|
yield prime, obj
end
end
def size
Float::INFINITY
end
end
# An implementation of +PseudoPrimeGenerator+.

7
test/test_prime.rb
View file

@ -106,6 +106,13 @@ class TestPrime < Test::Unit::TestCase
end
end
def test_enumerator_size
enum = Prime.each
assert_equal Float::INFINITY, enum.size
assert_equal Float::INFINITY, enum.with_object(nil).size
assert_equal Float::INFINITY, enum.with_index(42).size
end
def test_default_instance_does_not_have_compatibility_methods
assert !Prime.instance.respond_to?(:succ)
assert !Prime.instance.respond_to?(:next)