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When is std::weak_ptr useful?
...to promote it to a strong pointer. If that object still exists (because at least one strong pointer to it exists still) that operation succeeds and gives you a strong pointer to it. If that object does not exist (because all strong pointers went away), then that operation fails (and typically you re...
How does a Java HashMap handle different objects with the same hash code?
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Otherwise element is added to the bucket.
If the bucket already has at least one element, a new one gets added and placed in the first position of the bucket. Its next field refers to the old element.
Deletion
Calculate hashcode for the given key
Calculate bucket number hash % (arrayLength-1)...
Why does Hibernate require no argument constructor?
...wInstance(). It is recommended that you have a default constructor with at least package visibility for runtime proxy generation in Hibernate.
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What does 'require: false' in Gemfile mean?
...t generally matter unless you use the library. But requiring a gem will at least load its main file in lib, and probably it does more requires of its own. Even if you require 'yaml', you now have the YAML module as an object in memory.
– Nathan Long
Oct 17 '13 ...
How to get error message when ifstream open fails
...r the string returned by this function is implementation-dependant and (at least in G++'s libstdc++) this string has no useful information about the reason behind the error...
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How to make Git pull use rebase by default for all my repositories?
...fault policy for a repository.
If you want it for yourself and you use at least git 1.7.9, you can globally set the pull.rebase configuration as follow:
git config --global pull.rebase true
But you'll have to do on each machine. One option could be to configure the default user home template/ske...
Differences between numpy.random and random.random in Python
...om class. As far as I can tell, random.random.seed() is thread-safe (or at least, I haven't found any evidence to the contrary).
The numpy.random library contains a few extra probability distributions commonly used in scientific research, as well as a couple of convenience functions for generating ...
Differences between Oracle JDK and OpenJDK
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On ARM at least those two seem to be significantly different in performance. I would have to do some profiling on why it is happening, but the subjective difference is "Oracle JDK is ok" and "OpenJDK is completely unusable".
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LINQ .Any VS .Exists - What's the difference?
...he numbers: Every result has a recursion happening (3770377 : 2490249). At least for me, that's a sure sign something is not correct. I'm not a hundred percent sure on the maths here, but I think the odds of that recurring pattern happening is 1 in 999^999 (or 999! maybe?) per value. So the chance o...
What are the differences between double-dot “..” and triple-dot “…” in Git commit ranges?
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At least for git log. For git diff maybe things are reversed: stackoverflow.com/questions/7251477/…
– Benjamin Atkin
May 12 '17 at 19:37
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