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Explain Morris inorder tree traversal without using stacks or recursion
...edecessor to X in an inorder traversal. So X is made the right child of B, then current is set to Y. The tree now looks like this:
Y
/ \
A B
\
X
/ \
(Y) Z
/ \
C D
(Y) above refers to Y and all of its children, which are omitted for recursi...
When do we have to use copy constructors?
... safe to copy otherwise. If we want to allow copying safe-to-copy objects, then - if programming defensively - we need a run-time check in the user-defined copy constructor.
Non-copyable sub-objects
Sometimes, a class that should be copyable aggregates non-copyable sub-objects.
Usually, this hap...
How to avoid null checking in Java?
...) is a little harder. If you have no control over the code you're calling then you're stuck. If null is a valid response, you have to check for it.
If it's code that you do control, however (and this is often the case), then it's a different story. Avoid using nulls as a response. With methods ...
How to cast an Object to an int
...s an Object, the only way is to have an int considered/boxed as an Integer then stored as an Object.
If your object is a String, then you can use the Integer.valueOf() method to convert it into a simple int :
int i = Integer.valueOf((String) object);
It can throw a NumberFormatException if you...
nginx - nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
...because some systems (like FreeBSD) separate the IPv4 and IPv6 sockets and then it won't work, but for Linux it should be fine. wiki.nginx.org/HttpCoreModule#listen
– gitaarik
Mar 13 '13 at 16:03
...
MySQL order by before group by
...e max(post_date) by author is to use a subquery to return the max date and then join that to your table on both the post_author and the max date.
The solution should be:
SELECT p1.*
FROM wp_posts p1
INNER JOIN
(
SELECT max(post_date) MaxPostDate, post_author
FROM wp_posts
WHERE post_s...
Explanation of strong and weak storage in iOS5
...eople attach their leash to one dog, (five strong pointers to one object), then the dog will not run away until all five leashes are detached.
Weak pointers, on the other hand, are like little kids pointing at the dog and saying "Look! A dog!" As long as the dog is still on the leash, the little ki...
Is there a way to squash a number of commits non-interactively?
...
Make sure your working tree is clean, then
git reset --soft HEAD~3
git commit -m 'new commit message'
share
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Is it smart to replace boost::thread and boost::mutex with c++11 equivalents?
...rrible because "you depend on it"(I tried explaining the quality of boost, then gave up after some time :( ). Smaller reason why I would like to do it is that I would like to learn c++11 features, because people will start writing code in it.
So:
...
How to recover a dropped stash in Git?
...y I had some changes in my working tree that I had stashed and popped, and then I made more changes to my working tree. I'd like to go back and review yesterday's stashed changes, but git stash pop appears to remove all references to the associated commit.
...