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What are all the uses of an underscore in Scala?
...: A => Unit)
val set: Set[_ => Unit]
set.foreach(process _) // Error
set.foreach(process(_)) // No Error
}
In the first case, process _ represents a method; Scala takes the polymorphic method and attempts to make it monomorphic by filling in the type parameter, but realizes that the...
Is it safe to check floating point values for equality to 0?
...s because when calculations come into the ground, floating point precision error appears - a concept which does not exist in Real number arithmetics in Mathematics.
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How can I tell gcc not to inline a function?
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Using gcc 4.4.3 on Arch Linux, I get a syntax error with the attribute placed as above. It works correctly when it precedes the function (e.g., attribute ((noinline)) void foo() {})
– mrkj
Apr 16 '10 at 14:24
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How to install lxml on Ubuntu
... On Ubuntu 16.04 too zlib1g-dev is necessary. Without this I got the error /usr/bin/ld: cannot find -lz.
– Jabba
Aug 4 '16 at 16:02
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Check if one IEnumerable contains all elements of another IEnumerable
...tyComparer<TSource> comparer)
{
if (first == null)
throw Error.ArgumentNull("first");
if (second == null)
throw Error.ArgumentNull("second");
return Enumerable.IntersectIterator<TSource>(first, second, comparer);
}
private static IEnumerable<TSource> In...
Performance of Find() vs. FirstOrDefault() [duplicate]
...ce, Func<TSource, bool> predicate)
{
if (source == null)
throw Error.ArgumentNull("source");
if (predicate == null)
throw Error.ArgumentNull("predicate");
foreach (TSource source1 in source)
{
if (predicate(source1))
return source1;
}
return default (TSource);
}
...
commands not found on zsh
...ng this in your terminal first: export PATH=$HOME/.local/bin:$PATH
If the error disappears after you type this into the terminal and your terminal functions normally, the above solution will work. If it doesn't, you'll have to find the folder where your reference error is located (the thing not fo...
How do I maintain the Immersive Mode in Dialogs?
...ld do this in onCreateDialog(), we would get a requestFeature()
// error.
getDialog().getWindow().getDecorView().setSystemUiVisibility(
getActivity().getWindow().getDecorView().getSystemUiVisibility()
);
// Make the dialogs window focusable again.
...
Twitter Bootstrap Tabs: Go to Specific Tab on Page Reload or Hyperlink
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After upgrade jquery to 1.11 from 1.09 I get this error: Syntax error, unrecognized expression: .nav-tabs a[href=#tab-2]. Solved using stackoverflow.com/questions/12131273/…
– Pietro Z.
Jan 31 '16 at 11:11
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How to check for null in Twig?
...se (such as zero, empty string and empty array). Besides, it will cause an error if var is not defined. A safer way would be:
{% if var is not defined or var is null %}
which can be shortened to:
{% if var|default is null %}
If you don't provide an argument to the default filter, it assumes NU...