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in a “using” block is a SqlConnection closed on return or exception?
...!= null)
((IDisposable)connection).Dispose();
}
Edit: Fixing the cast to Disposable
http://msdn.microsoft.com/en-us/library/yh598w02.aspx
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Is it safe to check floating point values for equality to 0?
...rns true
The problem is, programmer sometimes forgets that implicit type cast (double to float) is happening for the comparison and the it results into a bug.
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How to change to an older version of Node.js
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on ubuntu ,the following error is casted:npm WARN using --force I sure hope you know what you are doing.
– Harlan Chen
Dec 15 '18 at 6:29
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Difference between 'new operator' and 'operator new'?
...own container, you can call operator new directly, like:
char *x = static_cast<char *>(operator new(100));
It's also possible to overload operator new either globally, or for a specific class. IIRC, the signature is:
void *operator new(size_t);
Of course, if you overload an operator new...
What's the point of malloc(0)?
...ate memory of correct size. The malloc function is unaware of what you're casting its result to. The malloc function relies purely on the size number that you give as its argument. You need to do malloc(sizeof(int)) to get enough storage to hold an int, for example, not 0.
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Get to UIViewController from UIView?
...roller *) firstAvailableUIViewController {
// convenience function for casting and to "mask" the recursive function
return (UIViewController *)[self traverseResponderChainForUIViewController];
}
- (id) traverseResponderChainForUIViewController {
id nextResponder = [self nextResponder];
...
Databinding an enum property to a ComboBox in WPF
... get
{
return Enum.GetValues(typeof(MyEnumType))
.Cast<MyEnumType>();
}
}
In XAML the ItemSource binds to MyEnumTypeValues and SelectedItem binds to SelectedMyEnumType.
<ComboBox SelectedItem="{Binding SelectedMyEnumType}" ItemsSource="{Binding MyEnumTypeVal...
Python: changing value in a tuple
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It seems unnecessary and memory inefficient to recast into a list and use a temporary variable. You can just unpack into a tuple with the same name and while unpacking update whatever needs updating.
– Brian Spiering
Oct 5 '18 at 3:23
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What are the differences between vector and list data types in R?
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As someone who's just gotten into R, but comes from a C/Java/Ruby/PHP/Python background, here's how I think of it.
A list is really an array + a hashmap. It's a PHP associative array.
> foo = list(bar='baz')
> foo[1]
'baz'
> foo$bar
'baz'
> foo[['bar']]
'baz'
A vector is a f...
Why does Oracle 9i treat an empty string as NULL?
...ations arise when '' is being implicitely converted to a VARCHAR2, such as cast('' as char(1)) is null which is... surprisingly TRUE
– sehe
Jul 19 '13 at 15:17
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