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Rails migration: t.references with alternative name?
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edited Apr 17 '18 at 13:33
ndnenkov
32.3k99 gold badges6060 silver badges9090 bronze badges
answered...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...e (just don't look at me when they're not as fast :)
Options
Low Memory (32-bit int, 32-bit machine)(from here):
unsigned int
reverse(register unsigned int x)
{
x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
x = (((x & 0xcccccccc) >> 2) | ((x & ...
C++ SFINAE examples?
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73
Heres one example (from here):
template<typename T>
class IsClassT {
private:
typed...
Detecting when the 'back' button is pressed on a navbar
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316
UPDATE: According to some comments, the solution in the original answer does not seem to work ...
PostgreSQL return result set as JSON array?
...e result looks like this:
[{"a":1,"b":"value1"},{"a":2,"b":"value2"},{"a":3,"b":"value3"}]
9.3 and up
The json_agg function produces this result out of the box. It automatically figures out how to convert its input into JSON and aggregates it into an array.
SELECT json_agg(t) FROM t
There is ...
What's the reason I can't create generic array types in Java?
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answered May 28 '10 at 17:39
newacctnewacct
106k2626 gold badges143143 silver badges214214 bronze badges
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Passing enum or object through an intent (the best solution)
...m result =
EnumUtil.deserialize(AwesomeEnum.class).from(intent);
OPTION 3 (with Kotlin):
It's been a while, but since now we have Kotlin, I thought I would add another option for the new paradigm. Here we can make use of extension functions and reified types (which retains the type when compilin...
Comparing two collections for equality irrespective of the order of items in them
...oreach (T val in enumerable.OrderBy(x => x))
hash = hash * 23 + (val?.GetHashCode() ?? 42);
return hash;
}
}
Sample usage:
var set = new HashSet<IEnumerable<int>>(new[] {new[]{1,2,3}}, new MultiSetComparer<int>());
Console.WriteLine(set.Contains(new [...
Should I always return IEnumerable instead of IList?
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edited Dec 10 '12 at 8:31
answered Jul 2 '09 at 5:29
Jon...
Pairs from single list
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answered Jan 7 '11 at 17:35
Jochen RitzelJochen Ritzel
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