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What are some (concrete) use-cases for metaclasses?

...a couple functions I found that I was able to increment the figure count, call draw manually, etc, but I needed to do these before and after every plotting call. So to create both an interactive plotting wrapper and an offscreen plotting wrapper, I found it was more efficient to do this via metacla...
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Are default enum values in C the same for all compilers?

When declaring an enum as shown below, do all C compilers set the default values as x=0 , y=1 , and z=2 on both Linux and Windows systems? ...
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What do all of Scala's symbolic operators mean?

...se of teaching, into four categories: Keywords/reserved symbols Automatically imported methods Common methods Syntactic sugars/composition It is fortunate, then, that most categories are represented in the question: -> // Automatically imported method ||= // Syntactic sugar ++= // Syn...
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SQL Server 2008: how do I grant privileges to a username?

... If you want to give your user all read permissions, you could use: EXEC sp_addrolemember N'db_datareader', N'your-user-name' That adds the default db_datareader role (read permission on all tables) to that user. There's also a db_datawriter role - whi...
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Rebuild IntelliJ project indexes

IntelliJ IDEA 10.5.1 is reporting zero usages for all method, classes etc. 2 Answers ...
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Is it ever advantageous to use 'goto' in a language that supports loops and functions? If so, why?

...o this already): Cleanly exiting a function Often in a function, you may allocate resources and need to exit in multiple places. Programmers can simplify their code by putting the resource cleanup code at the end of the function, and all "exit points" of the function would goto the cleanup label....
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Differences between git remote update and fetch?

...C30 fetch Documentation/RelNotes/* | less Then I did a less search for --all, and this is what I found under the release notes for Git version 1.6.6: git fetch learned --all and --multiple options, to run fetch from many repositories, and --prune option to remove remote tracking branches that ...
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What is the purpose of `text=auto` in `.gitattributes` file?

...f form: pattern attr1 attr2 ... So here, the pattern is *, which means all files, and the attribute is text=auto. What does text=auto do? From the documentation: When text is set to "auto", the path is marked for automatic end-of-line normalization. If Git decides that the content is text, ...
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What is the difference between persist() and merge() in JPA and Hibernate?

...these other entities are annotated with the cascade=PERSIST or cascade=ALL annotation element value or specified with the equivalent XML descriptor element. If X is a removed entity, it becomes managed. If X is a detached object, the EntityExistsException may be thrown when the...
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Convert data.frame column format from character to factor

...e to the world of R. mtcars #look at this built in data set str(mtcars) #allows you to see the classes of the variables (all numeric) #one approach it to index with the $ sign and the as.factor function mtcars$am <- as.factor(mtcars$am) #another approach mtcars[, 'cyl'] <- as.factor(mtcars[...