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Why do we need fibers

...Ruby class in Ruby 1.9. These are incredibly useful. In Ruby 1.9, if you call almost any iterator method on the core classes, without passing a block, it will return an Enumerator. irb(main):001:0> [1,2,3].reverse_each => #<Enumerator: [1, 2, 3]:reverse_each> irb(main):002:0> "abc"....
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What is the rationale for all comparisons returning false for IEEE754 NaN values?

Why do comparisons of NaN values behave differently from all other values? That is, all comparisons with the operators ==, =, where one or both values is NaN returns false, contrary to the behaviour of all other values. ...
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What exactly is a Context in Java? [duplicate]

...'s ApplicationContext, Android's Context, JNDI's InitialContext, etc. They all often follow the Facade Pattern which abstracts the environmental details the enduser doesn't need to know about away in a single interface/class. ...
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Nginx 403 forbidden for all files

I have nginx installed with PHP-FPM on a CentOS 5 box, but am struggling to get it to serve any of my files - whether PHP or not. ...
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How to add a primary key to a MySQL table?

... Column If you want to add a primary key constraint to an existing column all of the previously listed syntax will fail. To add a primary key constraint to an existing column use the form: ALTER TABLE `goods` MODIFY COLUMN `id` INT(10) UNSIGNED PRIMARY KEY AUTO_INCREMENT; ...
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What exactly is Apache Camel?

... If you have 5 to 10 minutes, I generally recommend people to read this Integration with Apache Camel by Jonathan Anstey. It's a well written piece which gives a brief introduction to and overview of some of Camel's concepts, and it implements a use case with co...
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How Do I Fetch All Old Items on an RSS Feed?

... RSS/Atom feeds does not allow for historic information to be retrieved. It is up to the publisher of the feed to provide it if they want such as in the blogger or wordpress examples you gave above. The only reason that Google Reader has more inform...
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Override and reset CSS style: auto or none don't work

I would like to override following CSS styling defined for all tables: 7 Answers 7...
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Is a successor for TeX/LaTeX in sight? [closed]

... There is a LaTeX3 project that has been going on for basically forever. In that sense, it is a successor to the current LaTeX2e. You forget/ignore the primary goal for TeX when it was created -- "TeX is a new typesetting system intended for the creation of beautiful books". The goa...
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How to get names of classes inside a jar file?

I have a JAR file and I need to get the name of all classes inside this JAR file. How can I do that? 12 Answers ...