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What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
...emfile.lock file is where Bundler records the exact versions that were installed. This way, when the same library/project is loaded on another machine, running bundle install will look at the Gemfile.lock and install the exact same versions, rather than just using the Gemfile and installing the most...
Equivalent C++ to Python generator pattern
...to signal termination
In your trivial example, it's easy enough. Conceptually:
struct State { unsigned i, j; };
State make();
void next(State&);
bool isDone(State const&);
Of course, we wrap this as a proper class:
class PairSequence:
// (implicit aliases)
public std::iterat...
What does it mean: The serializable class does not declare a static final serialVersionUID field? [d
...ization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiv...
Git Clone: Just the files, please?
...hive.
See backing up project which uses git: it will include in an archive all files (including submodules if you are using the git-archive-all script)
You can then use that archive anywhere, giving you back only files, no .git directory.
git archive --remote=<repository URL> | tar -t
If y...
Can Selenium Webdriver open browser windows silently in background?
...um RC?
You can 'supposedly', pass in some parameters into Chrome, specifically: --no-startup-window
Note that for some browsers, especially IE, it will hurt your tests to not have it run in focus.
You can also hack about a bit with AutoIT, to hide the window once it's opened.
...
What's the best way to store a group of constants that my program uses? [closed]
...way to store them? I don't think I want an Enum , because the data is not all the same type, and I want to manually set each value. Should I just store them all in an empty class? Or is there a better way?
...
Controlling a USB power supply (on/off) with Linux
Is it possible to turn on/off power supplies from USB manually with Linux?
10 Answers
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Hibernate vs JPA vs JDO - pros and cons of each? [closed]
... other advantage of JDO/DataNucleus over hibernate is that it doesn't have all the run time reflection overhead and is more memory efficient because it uses build time byte code enhancement (maybe add 1 sec to your build time for a large project) rather than hibernate's run time reflection powered p...
How to replace ${} placeholders in a text file?
...
Small hint: if "1" or "dog" in the given example would contain a dollar symbol, you would have to escape it with a backslash (otherwise replacement does not occur).
– MatthieuP
Jan 10 '09 ...
Predicate in Java
...or any string that matches its given regular expression.
This is essentially an OOP abstraction for a boolean test.
For example, you may have a helper method like this:
static boolean isEven(int num) {
return (num % 2) == 0; // simple
}
Now, given a List<Integer>, you can process onl...