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Should I declare Jackson's ObjectMapper as a static field?
...They are fully immutable, thread-safe, meaning that it is not even theoretically possible to cause thread-safety issues (which can occur with ObjectMapper if code tries to re-configure instance).
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How do I copy a version of a single file from one git branch to another?
...aths do
Multiple paths can be specified
an alternative:
git show commit_id:path/to/file > path/to/file
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Is short-circuiting logical operators mandated? And evaluation order?
... ||, then both operands must be evaluated as it becomes a regular function call.
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How to check if IEnumerable is null or empty?
...op the this there – I consider extension methods which are assumed to be called on null as a sign of ugly design.
– Mormegil
Feb 18 '11 at 22:49
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Is std::unique_ptr required to know the full definition of T?
...or.
Undefined behavior can occur when you have an incomplete type and you call delete on it:
class A;
A* a = ...;
delete a;
The above is legal code. It will compile. Your compiler may or may not emit a warning for above code like the above. When it executes, bad things will probably happen. If y...
How to create index on JSON field in Postgres?
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Found:
CREATE TABLE publishers(id INT, info JSON);
CREATE INDEX ON publishers((info->>'name'));
As stated in the comments, the subtle difference here is ->> instead of ->. The former one returns the value as text, the latter as a JSON obj...
What's the difference between unit, functional, acceptance, and integration tests? [closed]
...s may disagree.
Unit Tests
Tests the smallest unit of functionality, typically a method/function (e.g. given a class with a particular state, calling x method on the class should cause y to happen). Unit tests should be focussed on one particular feature (e.g., calling the pop method when the sta...
No ConcurrentList in .Net 4.0?
... I found that simply synchronizing adds to a List<T> was faster. Basically, adding to a List<T> is lightning fast already; the complexity of the computational steps involved is miniscule (increment an index and assign to an element in an array; that's really it). You would need a ton of ...
Is there some way to PUSH data from web server to browser?
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Yes, it's called Reverse Ajax or Comet. Comet is basically an umbrella term for different ways of opening long-lived HTTP requests in order to push data in real-time to a web browser. I'd recommend StreamHub Push Server, they have so...
How to exit an if clause
...sidering using Python. In other words: don't worry so much about function call overhead.
– ephemient
Jan 15 '10 at 5:47
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