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One DbContext per web request… why?
I have been reading a lot of articles explaining how to set up Entity Framework's DbContext so that only one is created and used per HTTP web request using various DI frameworks.
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Can a local variable's memory be accessed outside its scope?
... the top drawer of the bedside table and go to sleep. You check out the next morning, but "forget" to give back your key. You steal the key!
A week later, you return to the hotel, do not check in, sneak into your old room with your stolen key, and look in the drawer. Your book is still there. Asto...
What is polymorphism, what is it for, and how is it used?
...sent the same interface for differing underlying forms (data types).
For example, in many languages, integers and floats are implicitly polymorphic since you can add, subtract, multiply and so on, irrespective of the fact that the types are different. They're rarely considered as objects in the usu...
Does static constexpr variable inside a function make sense?
... a large array), does it make sense to declare it both static and constexpr ? constexpr guarantees that the array is created at compile time, so would the static be useless?
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What is Mocking?
...n unit testing. An object under test may
have dependencies on other (complex) objects. To isolate the behavior
of the object you want to replace the other objects by mocks that
simulate the behavior of the real objects. This is useful if the real
objects are impractical to incorporate into the unit ...
Is it possible to print a variable's type in standard C++?
For example:
19 Answers
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@property retain, assign, copy, nonatomic in Objective-C
... solutions. In fact nonatomic is generally the better choice as it omits extremely expensive thread locks. The only reason to use atomic is if your property might be set from multiple threads (in which case omitting it can lead to an over-release or a leak).
– Adam Kaplan
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Difference between timestamps with/without time zone in PostgreSQL
...e.
Whether the value is specified with a particular time zone.
Here are examples covering the combinations of those factors:
foo=> SET TIMEZONE TO 'Japan';
SET
foo=> SELECT '2011-01-01 00:00:00'::TIMESTAMP;
timestamp
---------------------
2011-01-01 00:00:00
(1 row)
foo=> S...
How to configure multi-module Maven + Sonar + JaCoCo to give merged coverage report?
...hat many people had the same issue, but no one could be bothered to fully explain how they solved it.
The Sonar docs refer to a GitHub project with examples that are helpful. What I did to solve this was to apply the integration tests logic to regular unit tests (although proper unit tests should...
multi-layer perceptron (MLP) architecture: criteria for choosing number of hidden layers and size of
...t linearly separable, it doesn't hurt to verify this--why use a more complex model than the task requires? If it is linearly separable then a simpler technique will work, but a Perceptron will do the job as well.
Assuming your data does require separation by a non-linear technique, then always star...