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Check if a Class Object is subclass of another Class Object in Java
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if (o instanceof Number) {
double d = ((Number)o).doubleValue(); //this cast is safe
}
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How do I specify the Linq OrderBy argument dynamically?
...method to be an IOrderedQueryable instead of an IQueryable, you can simply cast the result as follows:
public static IOrderedQueryable<TEntity> OrderBy<TEntity>(this IQueryable<TEntity> source, string orderByProperty, bool desc)
{
string command = desc ? "OrderByDescending" :...
What is the best regular expression to check if a string is a valid URL?
...|| uri.Scheme == Uri.UriSchemeHttps
|| uri.Scheme == Uri.UriSchemeFtp
|| uri.Scheme == Uri.UriSchemeMailto
/*...*/);
}
// In test fixture...
[Test]
void IsValidUrl_Test()
{
Assert.True(IsValidUrl("http://www.example.com"));
Assert.False(IsValidUrl("javascript:...
How to implement onBackPressed() in Fragments?
...mixing safe calls (.?) and enforcing non-nulls (!!) can lead to NPEs - the cast is not always safe. I'd rather write if ((fragment as? IOnBackPressed)?.onBackPressed()?.not() == true) { ... } or more kotliney (fragment as? IOnBackPressed)?.onBackPressed()?.not()?.let { ... }
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What is the equivalent of the C++ Pair in Java?
...you really want a pair despite the limitations, there's always Object[2] + casts :-)
– marcus
Dec 14 '16 at 0:41
The t...
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...
How can I run a PHP script in the background after a form is submitted?
... There's a pending edit suggestion to escape$post_id; I would rather cast it directly to a number: (int) $post_id. (Calling out for your attention to decide which is better.)
– Al.G.
Sep 28 '17 at 22:03
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