kcburge

class Collatz
  def initialize(observer)
    @observer = observer
    @lengths = Hash.new
  end

  def length(num)
    len = @lengths[num]

    if !len

kcburge

# The following iterative sequence is defined for the set of positive integers:

# Given a number n in the Collatz sequence,
# if n is even, the next number in the sequence is n/2
# if n is odd, the next number in the sequence is 3n + 1

# Applying the rule above with the starting number 13, we generate the following sequence:

# 13 40 20 10 5 16 8 4 2 1 It can be seen that this sequence (starting at 13 and
# finishing at 1) contains 10 terms. Although it has not been proved yet

kcburge

#0  0x0000003eafc35c39 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 9552
        selftid = 9552
#1  0x0000003eafc37348 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x7fffe35180a8, sa_sigaction = 0x7fffe35180a8}, sa_mask = {__val = {269238112115, 139966439121016, 64, 4294967295, 269236765939, 4, 140737007142160,
              12403688816, 140737007142240, 568745990, 0, 0, 0, 21474836480, 139966434291712, 269238123912}}, sa_flags = 2044879046,
          sa_restorer = 0x7f4c79e26280 <IndexerJob::update(std::shared_ptr<IndexerJob> const&)::__PRETTY_FUNCTION__>}
        sigs = {__val = {32, 0 <repeats 15 times>}}

kcburge

#0  0x0000003eafc35c39 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x0000003eafc37348 in __GI_abort () at abort.c:89
#2  0x0000003eafc2eb96 in __assert_fail_base (fmt=0x3eafd7bd88 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7f4c79e260c6 "!(flags & Complete)",
    file=file@entry=0x7f4c79e26078 "/home/kevin/Source/System/rtags/src/IndexerJob.cpp", line=line@entry=64,
    function=function@entry=0x7f4c79e26280 <IndexerJob::update(std::shared_ptr<IndexerJob> const&)::__PRETTY_FUNCTION__> "bool IndexerJob::update(const std::shared_ptr<IndexerJob>&)") at assert.c:92
#3  0x0000003eafc2ec42 in __GI___assert_fail (assertion=0x7f4c79e260c6 "!(flags & Complete)", file=0x7f4c79e26078 "/home/kevin/Source/System/rtags/src/IndexerJob.cpp", line=64,
    function=0x7f4c79e26280 <IndexerJob::update(std::shared_ptr<IndexerJob> const&)::__PRETTY_FUNCTION__> "bool IndexerJob::update(const std::shared_ptr<IndexerJob>&)") at assert.c:101
#4  0x00007f4c79c1b380 in I