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* array.c (rb_ary_bsearch): add Array#bsearch for binary search.

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[ruby-core:36390] [Feature #4766]

* test/ruby/test_array.rb: add a test for above.

* range.c (range_bsearch): add Range#bsearch for binary search.
  [ruby-core:36390] [Feature #4766]

* test/ruby/test_range.rb: add a test for above

* NEWS: added the two new methods.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37655 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
mame 2012-11-14 15:53:50 +00:00
parent c8b0b5362c
commit de07850e47
6 changed files with 511 additions and 0 deletions
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78
test/ruby/test_range.rb
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@ -355,4 +355,82 @@ class TestRange < Test::Unit::TestCase
assert_equal 5, (1.1...6).size
assert_equal 42, (1..42).each.size
end
def test_bsearch_for_fixnum
ary = [3, 4, 7, 9, 12]
assert_equal(0, (0...ary.size).bsearch {|i| ary[i] >= 2 })
assert_equal(1, (0...ary.size).bsearch {|i| ary[i] >= 4 })
assert_equal(2, (0...ary.size).bsearch {|i| ary[i] >= 6 })
assert_equal(3, (0...ary.size).bsearch {|i| ary[i] >= 8 })
assert_equal(4, (0...ary.size).bsearch {|i| ary[i] >= 10 })
assert_equal(nil, (0...ary.size).bsearch {|i| ary[i] >= 100 })
assert_equal(0, (0...ary.size).bsearch {|i| true })
assert_equal(nil, (0...ary.size).bsearch {|i| false })
ary = [0, 100, 100, 100, 200]
assert_equal(1, (0...ary.size).bsearch {|i| ary[i] >= 100 })
end
def test_bsearch_for_float
inf = Float::INFINITY
assert_in_delta(10.0, (0.0...100.0).bsearch {|x| x > 0 && Math.log(x / 10) >= 0 }, 0.0001)
assert_in_delta(10.0, (0.0...inf).bsearch {|x| x > 0 && Math.log(x / 10) >= 0 }, 0.0001)
assert_in_delta(-10.0, (-inf..100.0).bsearch {|x| x >= 0 || Math.log(-x / 10) < 0 }, 0.0001)
assert_in_delta(10.0, (-inf..inf).bsearch {|x| x > 0 && Math.log(x / 10) >= 0 }, 0.0001)
assert_equal(nil, (-inf..5).bsearch {|x| x > 0 && Math.log(x / 10) >= 0 }, 0.0001)
assert_in_delta(10.0, (-inf.. 10).bsearch {|x| x > 0 && Math.log(x / 10) >= 0 }, 0.0001)
assert_equal(nil, (-inf...10).bsearch {|x| x > 0 && Math.log(x / 10) >= 0 }, 0.0001)
assert_equal(nil, (-inf..inf).bsearch { false })
assert_equal(-inf, (-inf..inf).bsearch { true })
assert_equal(inf, (0..inf).bsearch {|x| x == inf })
assert_equal(nil, (0...inf).bsearch {|x| x == inf })
v = (-inf..0).bsearch {|x| x != -inf }
assert_operator(-Float::MAX, :>=, v)
assert_operator(-inf, :<, v)
v = (0.0..1.0).bsearch {|x| x > 0 } # the nearest positive value to 0.0
assert_in_delta(0, v, 0.0001)
assert_operator(0, :<, v)
assert_equal(0.0, (-1.0..0.0).bsearch {|x| x >= 0 })
assert_equal(nil, (-1.0...0.0).bsearch {|x| x >= 0 })
v = (0..Float::MAX).bsearch {|x| x >= Float::MAX }
assert_in_delta(Float::MAX, v)
assert_equal(nil, v.infinite?)
v = (0..inf).bsearch {|x| x >= Float::MAX }
assert_in_delta(Float::MAX, v)
assert_equal(nil, v.infinite?)
v = (-Float::MAX..0).bsearch {|x| x > -Float::MAX }
assert_operator(-Float::MAX, :<, v)
assert_equal(nil, v.infinite?)
v = (-inf..0).bsearch {|x| x >= -Float::MAX }
assert_in_delta(-Float::MAX, v)
assert_equal(nil, v.infinite?)
v = (-inf..0).bsearch {|x| x > -Float::MAX }
assert_operator(-Float::MAX, :<, v)
assert_equal(nil, v.infinite?)
end
def test_bsearch_for_bignum
bignum = 2**100
ary = [3, 4, 7, 9, 12]
assert_equal(bignum + 0, (bignum...bignum+ary.size).bsearch {|i| ary[i - bignum] >= 2 })
assert_equal(bignum + 1, (bignum...bignum+ary.size).bsearch {|i| ary[i - bignum] >= 4 })
assert_equal(bignum + 2, (bignum...bignum+ary.size).bsearch {|i| ary[i - bignum] >= 6 })
assert_equal(bignum + 3, (bignum...bignum+ary.size).bsearch {|i| ary[i - bignum] >= 8 })
assert_equal(bignum + 4, (bignum...bignum+ary.size).bsearch {|i| ary[i - bignum] >= 10 })
assert_equal(nil, (bignum...bignum+ary.size).bsearch {|i| ary[i - bignum] >= 100 })
assert_equal(bignum + 0, (bignum...bignum+ary.size).bsearch {|i| true })
assert_equal(nil, (bignum...bignum+ary.size).bsearch {|i| false })
assert_raise(TypeError) { ("a".."z").bsearch {} }
end
end