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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?
...
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
19
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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
...
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...
What characters are allowed in an email address?
...
See RFC 5322: Internet Message Format and, to a lesser extent, RFC 5321: Simple Mail Transfer Protocol.
RFC 822 also covers email addresses, but it deals mostly with its structure:
addr-spec = local-part "@" domain ; global address
local-part = word *("." word...
commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated
...when using <h:commandLink> , <h:commandButton> or <f:ajax> , the action , actionListener or listener method associated with the tag are simply not being invoked. Or, the bean properties are not updated with submitted UIInput values.
...