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How to sort List of objects by some property
...esComparer implements Comparator<ActiveAlarm> {
@Override
public int compare(ActiveAlarm x, ActiveAlarm y) {
// TODO: Handle null x or y values
int startComparison = compare(x.timeStarted, y.timeStarted);
return startComparison != 0 ? startComparison
...
Are static fields inherited?
...
3 in all cases, since the static int total inherited by SomeDerivedClass is exactly the one in SomeClass, not a distinct variable.
Edit: actually 4 in all cases, as @ejames spotted and pointed out in his answer, which see.
Edit: the code in the second ques...
What does Expression.Quote() do that Expression.Constant() can’t already do?
...xtremely confusing and bug prone.
Long answer:
Consider the following:
(int s)=>(int t)=>s+t
The outer lambda is a factory for adders that are bound to the outer lambda's parameter.
Now, suppose we wish to represent this as an expression tree that will later be compiled and executed. Wh...
How to use C++ in Go
... linking a small test C++ class with Go
If you wrap you C++ code with a C interface you should be able to call your library with cgo (see the example of gmp in $GOROOT/misc/cgo/gmp).
I'm not sure if the idea of a class in C++ is really expressible in Go, as it doesn't have inheritance.
Here's an...
ActiveModel::ForbiddenAttributesError when creating new user
...e is an easier way to avoid the Strong Parameters at all, you just need to convert the parameters to a regular hash, as:
unlocked_params = ActiveSupport::HashWithIndifferentAccess.new(params)
model.create!(unlocked_params)
This defeats the purpose of strong parameters of course, but if you are i...
Default initialization of std::array?
...zed array of objects with such types will have indeterminate value, e.g.:
int plain_int;
int c_style_array[13];
std::array<int, 13> cxx_style_array;
Both the c-style array and std::array are filled with integers of indeterminate value, just as plain_int has indeterminate value.
Is there...
How to get names of enum entries?
...at the following enumeration:
enum colors { red, green, blue };
Will be converted essentially to this:
var colors = { red: 0, green: 1, blue: 2,
[0]: "red", [1]: "green", [2]: "blue" }
Because of this, the following will be true:
colors.red === 0
colors[colors.red] === "red"
co...
How does java do modulus calculations with negative numbers?
... want to get a negative number for negative inputs then you can use this:
int r = x % n;
if (r > 0 && x < 0)
{
r -= n;
}
Likewise if you were using a language that returns a negative number on a negative input and you would prefer positive:
int r = x % n;
if (r < 0)
{
r ...
Using a bitmask in C#
...unate necessity due to
// C#'s restriction against a where T : Enum constraint. (There are ways around
// this, but they're outside the scope of this simple illustration.)
public static class FlagsHelper
{
public static bool IsSet<T>(T flags, T flag) where T : struct
{
int flag...
What's the most efficient way to test two integer ranges for overlap?
Given two inclusive integer ranges [x1:x2] and [y1:y2], where x1 ≤ x2 and y1 ≤ y2, what is the most efficient way to test whether there is any overlap of the two ranges?
...