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What is a memory fence?
...
For performance gains modern CPUs often execute instructions out of order to make maximum use of the available silicon (including memory read/writes). Because the hardware enforces instructions integrity you never notice this in a single thread of execution. However for multiple threads or en...
How to use Comparator in Java to sort
...-1 if lhs should be before rhs
// return 0 otherwise (meaning the order stays the same)
}
});
if it's hard to remember, try to just remember that it's similar (in terms of the sign of the number) to:
lhs-rhs
That's in case you want to sort in ascending order : from smallest num...
How to delete an item in a list if it exists?
...ing)
The removemethod will remove only the first occurrence of thing, in order to remove all occurrences you can use while instead of if.
while thing in some_list: some_list.remove(thing)
Simple enough, probably my choice.for small lists (can't resist one-liners)
2) Duck-typed, EAFP styl...
MongoDB Many-to-Many Association
...f clear then is generally discouraged, but if needed can be implemented by ordering the operations:
Get the list of user names from Role.users.
Iterate the user names from step 1, remove the role name from User.roles.
Clear the Role.users.
In the case of an issue, which is most likely to occur w...
How can I turn a List of Lists into a List in Java 8?
...a List<Object> that contains all the objects in the same iteration order by using the features of Java 8?
9 Answers...
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
...use), not by record number. Discussions are
increasingly infinite-scroll ordered by date (again allowing index
use), not by paginated by post number. And so on.
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How to define a List bean in Spring?
...ing will automatically inject them into this list. If you need to preserve order (upper solution doesn't do that) you can do it in that way:
@Configuration
public class MyConfiguration {
@Autowired
private Stage1 stage1;
@Autowired
private Stage2 stage2;
@Bean
public List<Stage>...
Should I use encoding declaration in Python 3?
...
@pepr A Byte Order Mark could do the same, no?
– endolith
Jul 3 '17 at 15:01
12
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Is there a way to 'uniq' by column?
...sort's manpage says: "-u, --unique with -c, check for strict ordering; without -c, output only the first of an equal run." So, it is indeed "the first occurrence of the duplicate before sorting."
– Geremia
Apr 15 '16 at 17:32
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Is it possible to set the stacking order of pseudo-elements below their parent element? [duplicate]
..., you have to create a new stacking context to change the default stacking order.
Positioning the pseudo-element (absolute) and assigning a z-index value other than “auto” creates the new stacking context.
#element {
position: relative; /* optional */
width: 100px;
height: ...