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How can I modify this Ordering?


By : Vasanthsingh Bhat
Date : October 16 2020, 06:10 AM
hop of those help? You need to put an instance of your new Ordering implementation into the implicit namespace.
code :
implicit val mo :MyOrdering = new MyOrdering {}

val ordering = implicitly[MyOrdering]
implicit object MyOrdering extends Ordering[Long] {
  override def compare(x: Long, y: Long): Int = x compare y
}

val ordering = implicitly[MyOrdering.type]


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How to modify the content of an array according to its content ordering efficiently?


By : tangyong3691
Date : March 29 2020, 07:55 AM
it helps some times I have a question regarding array. For example, if I know the size of the array will be 5, and my programme read in , One option would be to have a class like this:
code :
class Tuple implements Comparable<Tuple> {
    int value;  // value
    int pos;    // position in array

    public Tuple(int value, int pos) {
        this.value = value;
        this.pos = pos;
    }

    @Override
    public int compareTo(Tuple other) {  // sort based on values
        return Integer.compare(value, other.value);
    }
}
Tuple[] tups = new Tuple[array.length];

for (int i = 0; i < array.length; i++)
    tups[i] = new Tuple(array[i], i);

Arrays.sort(tups);

for (int i = 0; i < array.length; i++)
    array[i] = tups[i].pos + 1;

Ternary operator issue in Guava: cannot convert from Ordering<Comparable> to Ordering<String>


By : user2585875
Date : March 29 2020, 07:55 AM
will help you I just met this weird condition with Guava's Ordering class. , Change:
code :
Ordering<String> ordering = flag ? Ordering.natural().nullsFirst() : Ordering.natural().nullsLast();
Ordering<String> ordering = flag ? Ordering.<String>natural().nullsFirst() : Ordering.<String>natural().nullsLast();
public static <C extends Comparable> Ordering<C> natural()

How to control and modify the std::map ordering using a user-defined key


By : user1666271
Date : March 29 2020, 07:55 AM
hope this fix your issue The problem is that your comparison operator implemented incorrectly, it does not provide strict weak ordering hence undefined behavior of the std::map, lets say you have 3 objects of MyKey:
code :
MyKey mk1{ "a",3 }, mk2{ "b", 2 }, mk3 { "a", 1 };
mk1 < mk2 -> true as 3 > 2
mk2 < mk3 -> true as 2 > 1
mk1 < mk3 -> false as addr is the same, but must be true

Independent Read-Modify-Write Ordering


By : user3719307
Date : March 29 2020, 07:55 AM
hop of those help? I haven't fully grokked your code yet, but the bolded question has a straightforward answer:

C++11 atomic memory ordering - is this a correct usage of relaxed (release-consume) ordering?


By : TetonSkier
Date : March 29 2020, 07:55 AM
this one helps. Why are you loading the old flags value twice in your CAS loops? The first time is by flags.load(), and the second by the compare_exchange_weak(), which the standard specifies on CAS failure will load the previous value into the first argument, which in this case is flagsNow.
According to http://en.cppreference.com/w/cpp/atomic/atomic/compare_exchange, "Otherwise, loads the actual value stored in *this into expected (performs load operation)." So what your loop is doing is that on failure, compare_exchange_weak() reloads flagsNow, then the loop repeats, and the first statement loads it once again, immediately after the load by compare_exchange_weak(). It seems to me your loop ought to instead have the load pulled outside the loop. For example, newSnap() would be:
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