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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...his event, so it detects the rotation even when we do not intend it to. In order to solve this problem, we add a buffer when we detect $MotionEvent.ACTION_MOVE$, so that we only fire “rotation” when the positions of two fingers change above some threshold.
Figure 6. Block designed for Rotatio...
Is there a constraint that restricts my generic method to numeric types?
...t for every type you like and use that accordingly (at compile time!).
In order to do this:
Create a new Text Template file called GenericNumberMethodTemplate.tt.
Remove the auto-generated code (you'll keep most of it, but some isn't needed).
Add the following snippet:
<#@ template languag...
What is the performance cost of having a virtual method in a C++ class?
...
I ran some timings on a 3ghz in-order PowerPC processor. On that architecture, a virtual function call costs 7 nanoseconds longer than a direct (non-virtual) function call.
So, not really worth worrying about the cost unless the function is something lik...
How to add onload event to a div element
...d of the html document just before the </body> tag? If yes, does the order in which they're written matter?
– Neo
Oct 10 '17 at 9:34
...
Find intersection of two nested lists?
...
Plus, using set will lead to code that's orders of magnitude faster. Here's a sample benchmark®: gist.github.com/andersonvom/4d7e551b4c0418de3160
– andersonvom
Nov 25 '15 at 15:33
...
How is Perl's @INC constructed? (aka What are all the ways of affecting where Perl modules are searc
...with a Perl array.
Note: The directories are unshifted onto @INC in the order listed in this answer, e.g. default @INC is last in the list, preceded by PERL5LIB, preceded by -I, preceded by use lib and direct @INC manipulation, the latter two mixed in whichever order they are in Perl code.
Refer...
Easiest way to convert a List to a Set in Java
...run. As I mentioned in my answer, you could use a tree set to get a stable ordering. Another option would be to use a LinkedHashSet which remembers the order that items were added to it.
– Spina
Sep 23 '13 at 12:45
...
Output array to CSV in Ruby
...e number of k/v pairs & that the keys are always the same, in the same order (i.e. if your data is structured), this should do the deed:
rowid = 0
CSV.open(fn, 'w') do |csv|
hsh_ary.each do |hsh|
rowid += 1
if rowid == 1
csv << hsh.keys# adding header row (column labels)
...
Is there any JSON Web Token (JWT) example in C#?
...und it,) are:
Changed HS256 -> RS256
Swapped the JWT and alg order in the header. Not sure who got it wrong, Google or the spec, but google takes it the way It is below according to their docs.
public enum JwtHashAlgorithm
{
RS256,
HS384,
HS512
}
public class JsonWebT...
What Makes a Good Unit Test? [closed]
...blem.
Tests should not rely on each other - Isolated. No assumptions about order of test execution. Ensure 'clean slate' before each test by using setup/teardown appropriately
Professional: In the long run you'll have as much test code as production (if not more), therefore follow the same standard...