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What is the __del__ method, How to call it?
...might not necessary happen right after and might not happen at all.
Even more, variables can live for a long time for many reasons, e.g. a propagating exception or module introspection can keep variable reference count greater than 0. Also, variable can be a part of cycle of references — CPython...
How do I test if a variable is a number in Bash?
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@Ben do you really want to handle more than one minus sign? I'd make it ^-? rather than ^-* unless you're actually doing the work to handle multiple inversions correctly.
– Charles Duffy
Jun 26 '11 at 22:57
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How can I apply a function to every row/column of a matrix in MATLAB?
...ctor of sums for each column
And here is how you would do this using the more complicated num2cell/cellfun option:
M = magic(10); %# A 10-by-10 matrix
C = num2cell(M, 1); %# Collect the columns into cells
columnSums = cellfun(@sum, C); %# A 1-by-10 vector of sums for...
Java Class.cast() vs. cast operator
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Why is second variant better? Isn't first variant more efficient because caller's code would do dynamic cast anyway?
– user1944408
Mar 4 '14 at 3:39
1
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Using margin:auto to vertically-align a div
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112
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C state-machine design [closed]
...c to that unit (which is why I used quotes around "global" above - they're more shared within the FSM, than truly global). As with all globals, it requires care.
The transitions array then defines all possible transitions and the functions that get called for those transitions (including the catch-...
Creating a blurring overlay view
...Width, .flexibleHeight]
view.addSubview(blurEffectView) //if you have more UIViews, use an insertSubview API to place it where needed
} else {
view.backgroundColor = .black
}
Objective-C:
//only apply the blur if the user hasn't disabled transparency effects
if (!UIAccessibilityIsReduceT...
How to create the perfect OOP application [closed]
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you need more than what was just provided? Sounds like you need to learn more about how inheritance is implemented, and what polymorphism is.
– Induster
Feb 25 '12 at 22:35
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The new keyword “auto”; When should it be used to declare a variable type? [duplicate]
...n(); it != v.end(); ++it) //v is some [std] container
{
//..
}
Or, more generally,
//good : auto increases readability here
for(auto it = std::begin(v); it != std::end(v); ++it)//v could be array as well
{
//..
}
But when the type is not very well-known and infrequently used , the...
How can I insert values into a table, using a subquery with more than one result?
...SERT INTO yourTable
VALUES(value1, value2)
But since you want to insert more than one record, you can use a SELECT FROM in your SQL statement.
so you will want to do this:
INSERT INTO prices (group, id, price)
SELECT 7, articleId, 1.50
from article
WHERE name LIKE 'ABC%'
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