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Adding up BigDecimals using Streams
...into a Stream<BigDecimal>
Call the reduce method.
3.1. We supply an identity value for addition, namely BigDecimal.ZERO.
3.2. We specify the BinaryOperator<BigDecimal>, which adds two BigDecimal's, via a method reference BigDecimal::add.
Updated answer, after edit
I see that you hav...
Python : List of dict, if exists increment a dict value, if not append a new dict
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But a dictionary full of counts is also a common pattern, so Python provides a ready-to-use class: containers.Counter You just create a Counter instance by calling the class, passing in any iterable; it builds a dictionary where the keys are values from the iterable, and the values are counts of...
Android - how do I investigate an ANR?
... the "main" thread. This is the event loop thread, and if it is busy, Android cannot process any further GUI events in the application, and thus throws up an ANR dialog.
Now, in the trace you posted, the main thread seems to be doing fine, there is no problem. It is idling in the MessageQueue, wait...
What is the difference between Numpy's array() and asarray() functions?
...ions? When should you use one rather than the other? They seem to generate identical output for all the inputs I can think of.
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How can I access “static” class variables within class methods in Python?
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@Constantin -- I didn't realize that, it's an interesting distinction. Thanks for the correction :-)
– bedwyr
Apr 3 '09 at 1:14
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What is the purpose of the “Prefer 32-bit” setting in Visual Studio and how does it actually work?
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@BrianDavidBerman there is, if you set false to 32-but preferred and set x64 or Any CPU on a 64-bit machine.
– Lex Li
Aug 4 '16 at 14:49
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What does the Q_OBJECT macro do? Why do all Qt objects need this macro?
... and introspection. It can lead to some perplexing behavior, so it's a bad idea.
– Unslander Monica
Apr 7 '16 at 20:39
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What is the difference between “screen” and “only screen” in media queries?
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Let's break down your examples one by one.
@media (max-width:632px)
This one is saying for a window with a max-width of 632px that you want to apply these styles. At that size you would be talking about anything smaller than a desktop screen in most cases.
@media screen and (m...
Does a const reference class member prolong the life of a temporary?
...in your example is bound to the constructor's argument n, and becomes invalid when the object n is bound to goes out of scope.
The lifetime extension is not transitive through a function argument. §12.2/5 [class.temporary]:
The second context is when a reference is bound to a temporary. The te...
Can you use hash navigation without affecting history?
I'm afraid it might be impossible but is there a way to change the hash value of a URL without leaving an entry in the browser's history and without reloading ? Or do the equivalent?
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