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Proper practice for subclassing UIView?
...wRect , and layoutSubviews . (I'm thinking in terms of setup and teardown callbacks.) In my case, I'm setting up my frame and internal views in layoutSubviews , but I'm not seeing anything onscreen.
...
Save PL/pgSQL output from PostgreSQL to a CSV file
...your local PC. It also needs to be run as a Postgres "superuser" (normally called "root") because Postgres can't stop it doing nasty things with that machine's local filesystem.
That doesn't actually mean you have to be connected as a superuser (automating that would be a security risk of a differe...
Are static fields inherited?
...because when the derived object is created, the derived class constructor calls the base class constructor.
So the value of the static variable is incremented twice.
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What is the difference between “INNER JOIN” and “OUTER JOIN”?
...Colour FROM A LEFT OUTER JOIN B ON A.Colour = B.Colour
Outer Joins are logically evaluated in the same way as inner joins except that if a row from the left table (for a left join) does not join with any rows from the right hand table at all it is preserved in the result with NULL values for the rig...
class
...class (eigenclass). This allows you to specialise the behaviour of methods called on that specific object.
a = 'foo'
class << a
def inspect
'"bar"'
end
end
a.inspect # => "bar"
a = 'foo' # new object, new singleton class
a.inspect # => "foo"
Now, to answer the questio...
How do you represent a graph in Haskell?
...n haskell using algebraic data types. But how would you go about typographically representing a graph? It seems that you need to have pointers. I'm guessing you could have something like
...
How can I get the executing assembly version?
...Forms application, you can always access via application if looking specifically for product version.
Application.ProductVersion
Using GetExecutingAssembly for an assembly reference is not always an option. As such, I personally find it useful to create a static helper class in projects where I m...
What is the ellipsis (…) for in this method signature?
... this case they are of type JID).
In your example, the following function calls would be valid:
MessageBuilder msgBuilder; //There should probably be a call to a constructor here ;)
MessageBuilder msgBuilder2;
msgBuilder.withRecipientJids(jid1, jid2);
msgBuilder2.withRecipientJids(jid1, jid2, jid7...
Is there a 'box-shadow-color' property?
... height: 30px;
box-shadow: 1px 1px 25px var(--box-shadow-color); /* Calling the variable */
}
.box-shadow:hover {
--box-shadow-color: #ff0000; /* Changing the value of the variable */
}
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Instance v state variables in react.js
...d (which should only be done by setState as suggested in a comment), React calls render and makes any necessary changes to the real DOM.
Because the value of timeout has no effect on the rendering of your component, it shouldn't live in state. Putting it there would cause unnecessary calls to rende...