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Does ARC support dispatch queues?
...-C object. This is documented in the <os/object.h> header file:
* By default, libSystem objects such as GCD and XPC objects are declared as
* Objective-C types when building with an Objective-C compiler. This allows
* them to participate in ARC, in RR management by the Blocks runtime and ...
Align elements side by side
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Apply float:left; to both of your divs should make them stand side by side.
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Find out how much memory is being used by an object in Python [duplicate]
How would you go about finding out how much memory is being used by an object? I know it is possible to find out how much is used by a block of code, but not by an instantiated object (anytime during its life), which is what I want.
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Count number of rows within each group
... I don't know but this could be useful as well... df %>% group_by(group, variable) %>% mutate(count = n())
– Manoj Kumar
Dec 14 '16 at 17:57
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指定组件的大小 · App Inventor 2 中文网
...s height and width. There are four choices:
Automatic: Size is chosen by the system
Fill parent: Size is chosen to fill the space available.
Size specified in pixels
Size in percent of Screen (not available for all components)
Since not all Android devices have the same screen size, it...
Is returning by rvalue reference more efficient?
...turns, the temporary object will get destructed. You should return Beta_ab by value, like the following
Beta_ab
Beta::toAB() const {
return Beta_ab(1, 1);
}
Now, it's properly moving a temporary Beta_ab object into the return value of the function. If the compiler can, it will avoid the mo...
Why do we need tuples in Python (or any immutable data type)?
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@ACoolie, that's totally dominated by the random calls (try doing just that, you'll see!), so not very significant. Try python -mtimeit -s "x=23" "[x,x]" and you'll see a more meaningful speedup of 2-3 times for building the tuple vs building the list.
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remove objects from array by object property
How do I remove an object from the array by matching object property?
13 Answers
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What is the difference between Strategy design pattern and State design pattern?
...s are passed to the context object as parameters, while States are created by the context object itself.
Strategies only handle a single, specific task, while States provide the underlying implementation for everything (or most everything) the context object does.
A "classic" implementation would ...
Your branch is ahead of 'origin/master' by 3 commits
...hich returned Everything up-to-date, after that the message of being ahead by x commits went away.
– Will B.
Nov 11 '14 at 16:28
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