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HashSet versus Dictionary w.r.t searching time to find if an item exists
...cause it gives you what you want: storing a set of values (as opposed to maintaining some kind of mapping). This answer indicates that there will be no negative impact on performance compared to Dictionary.
– Francois Beaussier
Apr 7 '17 at 6:38
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How to force ViewPager to re-instantiate its items [duplicate]
... the only solution.
ViewPager PagerAdapter not updating the View
public int getItemPosition(Object object) {
return POSITION_NONE;
}
Does anyone know whether this is a bug or not?
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im...
How to maintain a Unique List in Java?
... e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction.
Note: Great care must be exercised if mutable objects are used as set elements. The behavior of a set is not specified if the value of an object is changed in a manner t...
Does a method's signature in Java include its return type?
Does the method signature in a Java class/interface include its return type?
14 Answers
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How can I “unuse” a namespace?
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In general, this is a terrible idea. C++ headers are not intended to be included in an alternately namespace as was used here.
– Aaron
Oct 3 '08 at 18:06
23
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Get a list of distinct values in List
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Not before the Distinct() but after, if you are trying to convert to a list. Ex: Notes.Select(x => x.Author).Distinct().ToList();
– MTwiford
Apr 4 '17 at 20:03
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Appending a vector to a vector [duplicate]
...y be advisable. It's smart to use reserve if you are repeatedly inserting into a vector for which you know the final size, and that size is large. Otherwise, I'd let the STL grow your vector as needed.
– moodboom
Sep 10 '13 at 16:24
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What is the usefulness of `enable_shared_from_this`?
... shared_ptr<Y> f()
{
return shared_from_this();
}
}
int main()
{
shared_ptr<Y> p(new Y);
shared_ptr<Y> q = p->f();
assert(p == q);
assert(!(p < q || q < p)); // p and q must share ownership
}
The method f() returns a valid shared_ptr, eve...
Adding multiple columns AFTER a specific column in MySQL
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Try this
ALTER TABLE users
ADD COLUMN `count` SMALLINT(6) NOT NULL AFTER `lastname`,
ADD COLUMN `log` VARCHAR(12) NOT NULL AFTER `count`,
ADD COLUMN `status` INT(10) UNSIGNED NOT NULL AFTER `log`;
check the syntax
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Calculating frames per second in a game
...e global (i.e. keep it's value across all frames) and ideally a floating point number. It contains the average/aggregate value and get's updated on each frame. The higher the ratio, the longer it will take to settle the "time" variable towards a value (or drift it away from it).
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