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Why is XOR the default way to combine hashes?
...y you have two hashes H(A) and H(B) and you want to combine them. I've read that a good way to combine two hashes is to XOR them, e.g. XOR( H(A), H(B) ) .
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When to use cla(), clf() or close() for clearing a plot in matplotlib?
... fig.clf()
print(plt.get_fignums())
If memory is a concern somebody already posted a work-around in SO see:
Create a figure that is reference counted
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Benefits of inline functions in C++?
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@Johnsyweb: read my answer carefully. What you have said is true, when you are building an executable. But compiler can not simply ignore inline when building a shared library!
– doc
May 20 '10 at 6...
Linq to Entities join vs groupjoin
...ement);
yield return resultSelector(outerElement, lookup[key]);
}
Read more here:
Reimplementing LINQ to Objects: Part 19 - Join
Reimplementing LINQ to Objects: Part 22 - GroupJoin
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How do I execute inserts and updates in an Alembic upgrade script?
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In case I always wanted to read a SQL statement from an external file and then pass it to op.execute in upgrade(), is there a way to provide a default template to be used by alembic revision command (a default body for the generated .py file)?
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In C#, how do I calculate someone's age based on a DateTime type birthday?
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@jfren484 - read the Wikipedia article. It varies considerably across jurisdictions.
– Matt Johnson-Pint
Jul 12 '16 at 19:26
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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，包括leader选举等等，保障集群的可用性。
Lucene索引的Reader是基于索引的snapshot的，所以必须在索引commit的后，重新打开一个新的snapshot，才能搜索到新添加的内容；而索引的commit是非常耗性能的，这样达到实时索引搜索效率就...
What are fail-safe & fail-fast Iterators in Java
...nal data structures. There is no general pattern. If you are interested, read the source code for different collection classes.
1 - The rider is that fail-fast behavior assumes that the application id correctly with respect to synchronization and the memory model. That means that (for example) ...
XPath to select multiple tags
... I was mixing in differently-namespaced content (presumably intended to be read by a different toolchain), I would consider their behavior very inappropriate. That said, the argument is -- as you suggest -- a bit unbecoming.
– Charles Duffy
Oct 17 '10 at 20:43
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How to make node.js require absolute? (instead of relative)
... Please note that you can't unignore a subdirectory, if the parent is
already ignored. So instead of ignoring node_modules, you have to
ignore every directory inside node_modules with the
node_modules/* trick, and then you can add your exceptions.
Now anywhere in your application you wi...