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Check if a Class Object is subclass of another Class Object in Java
...stance = someObject instanceof SomeTypeOrInterface;
Example:
assertTrue(Arrays.asList("a", "b", "c") instanceof List<?>);
b) Check if an Object is an instance of a Class or Interface (including subclasses) you only know at runtime:
Class<?> typeOrInterface = // acquire class someho...
How do I concatenate two strings in C?
...ings that some other languages have. A string in C is just a pointer to an array of char that is terminated by the first null character. There is no string concatenation operator in C.
Use strcat to concatenate two strings. You could use the following function to do it:
#include <stdlib.h>
#...
How do I find the install time and date of Windows?
...at would go as:
Function GetInstallDate: String;
Var
di: longint;
buf: Array [ 0..3 ] Of byte;
Begin
Result := 'Unknown';
With TRegistry.Create Do
Begin
RootKey := HKEY_LOCAL_MACHINE;
LazyWrite := True;
OpenKey ( '\SOFTWARE\Microsoft\Windows NT\CurrentVersion', False );
di ...
In-memory size of a Python structure
... elif hasattr(obj, '__iter__') and not isinstance(obj, (str, bytes, bytearray)):
size += sum([get_size(i, seen) for i in obj])
return size
Used like so:
In [1]: get_size(1)
Out[1]: 24
In [2]: get_size([1])
Out[2]: 104
In [3]: get_size([[1]])
Out[3]: 184
If you want to know Pyth...
List of Rails Model Types
...ou use Rails 4 and PostgreSQL, you can take advantage of these:
:hstore
:array
:cidr_address
:ip_address
:mac_address
For UI mapping (Model scaffold data type -> HTML), the next image has all the basic field types:
...
Obtaining a powerset of a set in Java
...shSet<T>());
return sets;
}
List<T> list = new ArrayList<T>(originalSet);
T head = list.get(0);
Set<T> rest = new HashSet<T>(list.subList(1, list.size()));
for (Set<T> set : powerSet(rest)) {
Set<T> newSet = new HashSet&l...
NodeJS - What does “socket hang up” actually mean?
...ns? I'm trying to build safeguards here by adding the offending urls to an array then scraping them later. I read in a few places that the errors might be a queuing issue with Node, don't know the best way to remedy and avoid this.
– JVG
Jun 8 '13 at 2:00
...
How to get JavaScript caller function line number? How to get JavaScript caller source URL?
...hich adds whatever other useful workarounds you need - eg fixed for Chrome array logging) and still line numbers from wherever you called log().
– mikemaccana
Apr 17 '12 at 12:16
6...
How do I sort a vector of pairs based on the second element of the pair?
...e type of the returned expression after lvalue-to-rvalue conversion (4.1), array-to-pointer conversion (4.2), and function-to-pointer conversion (4.3);
otherwise, void.
To explicitly specify the return type use the form []() -> Type { }, like in:
sort(v.begin(), v.end(),
[](const pai...
GMSGroundOverlay animating - should I be using a CATiledLayer?
...eypaths separately.
First calculate the points and add them to 2 separate arrays, one for latitude value (y) and one for longitude (x) and then use the values property in CAKeyFrameAnimation to animate. Create 2 CAKeyFrameAnimation objects (1 for each axis) and group them together using CAAnimation...