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List of lists changes reflected across sublists unexpectedly
...nt list [[1] * 4] evaluates to, not the [[1] * 4 expression text. * has no idea how to make copies of that element, no idea how to reevaluate [[1] * 4], and no idea you even want copies, and in general, there might not even be a way to copy the element.
The only option * has is to make new referenc...
Hidden features of Scala
...gher-kinded types)
Without this feature you can, for example, express the idea of mapping a function over a list to return another list, or mapping a function over a tree to return another tree. But you can't express this idea generally without higher kinds.
With higher kinds, you can capture the ...
How to clear/remove observable bindings in Knockout.js?
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Isn't the idea of KO that you should very rarely be touching the dom yourself? This answer loops through the dom , and would certainly be far from unusable in my use case.
– Blowsie
May 14 '13 at ...
How to generate a random int in C?
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+1 for simplicity, but it is probably a good idea to emphasize that srand() should only be called once. Also, in a threaded application, you might want to make sure that the generator's state is stored per thread, and seed the generator once for each thread.
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Check if a string is html or not
...) {
if (c[i].nodeType == 1) return true;
}
return false;
}
The idea is to allow browser DOM parser to decide if provided string looks like an HTML or not. As you can see it simply checks for ELEMENT_NODE (nodeType of 1).
I made a couple of tests and looks like it works:
isHTML('<a&g...
Return all enumerables with yield return at once; without looping through
...ollection must be created per call, returning a collection is a really bad idea.
Most collections can be modified when returned.
The collection is of finite size.
Sequences
Can be enumerated - and that is pretty much all we can say for sure.
A returned sequence itself cannot be modified.
Each ...
Can I make a user-specific gitignore file?
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For example, you want ignore ~/some/path/.idea folder:
# 1. Add .idea to user specific gitignore file
echo .idea > ~/.gitignore
# 2. Add gitignore file to gitconfig
git config --global core.excludesfile ~/.gitignore
...
What's the need of array with zero elements?
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The idea is to allow for a variable-sized array at the end of the struct. Presumably, bts_action is some data packet with a fixed-size header (the type and size fields), and variable-size data member. By declaring it as a 0-len...
Can I list-initialize a vector of move-only type?
...gt; idiom described on cpptruths (cpptruths.blogspot.com/2013/09/…). The idea is to determine lvalue/rvalue at run-time and then call move or copy-construction. in<T> will detect rvalue/lvalue even though the standard interface provided by initializer_list is const reference.
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How do I call ::std::make_shared on a class with only protected or private constructors?
...ve(retval);
}
Edit 2017-01-06: I changed this to make it clear that this idea is clearly and simply extensible to constructors that take arguments because other people were providing answers along those lines and seemed confused about this.
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