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Java Synchronized Block for .class
...nchronized(X.class) uses the class instance as a monitor. As there is only one class instance (the object representing the class metadata at runtime) one thread can be in this block.
With synchronized(this) the block is guarded by the instance. For every instance only one thread may enter the bloc...
Mercurial: how to amend the last commit?
...ly nothing you can do, except if you have total control of all the other clones.
I'm not really familiar with the git commit --amend command, but AFAIK, Histedit is what seems to be the closest approach, but sadly it isn't shipped with Mercurial. MQ is really complicated to use, but you can do near...
Call one constructor from another
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May I know the execution order of this one? Everything in Sample(string) will be executed first then Sample(int) or the int version will be executed first then it will get back to the string version? (Like calling super() in Java?)
– Rosdi Ka...
Why are Standard iterator ranges [begin, end) instead of [begin, end]?
Why does the Standard define end() as one past the end, instead of at the actual end?
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Difference between Python's Generators and Iterators
..., but not vice versa. A generator is built by calling a function that has one or more yield expressions (yield statements, in Python 2.5 and earlier), and is an object that meets the previous paragraph's definition of an iterator.
You may want to use a custom iterator, rather than a generator, when...
Hide options in a select list using jQuery
... x-browser. If I recall ie has issues. The easiest thing to do is keep a cloned copy of the select before you remove items, this allows you to easily remove and then append the missing items back.
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How to return an empty ActiveRecord relation?
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There is a now a "correct" mechanism in Rails 4:
>> Model.none
=> #<ActiveRecord::Relation []>
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multiple definition of template specialization when using different objects
... need to put it in a .cpp file instead of a .h or you end up violating the one definition rule as David says. Note that when you partially specialize templates, the partial specializations do still depend on one or more template parameters, so they still go in a .h file.
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What's the Point of Multiple Redis Databases?
... separate databases as I sometimes need to make use of the keys command on one specific kind of data, and wanted to separate it to make that faster.
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Why should I use a pointer rather than the object itself?
...g from a Java background and have started working with objects in C++. But one thing that occurred to me is that people often use pointers to objects rather than the objects themselves, for example this declaration:
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