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'App not Installed' Error on Android
...in I have been creating a signed .apk and exporting it to my HTC Desire to test. It has all been fine.
61 Answers
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java.util.regex - importance of Pattern.compile()?
...ormance benefit can be quite significant.
I did a quick benchmark:
@Test
public void recompile() {
var before = Instant.now();
for (int i = 0; i < 1_000_000; i++) {
Pattern.compile("ab").matcher("abcde").matches();
}
System.out.println("recom...
running Rails console in production
...e production
production can of course be substituted with development or test (value is development by default)
Adding the option --sandbox makes it so that any changes you make to your database in the console will be rolled back after you exit
If this isn't working for you, you may need to try
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How is std::function implemented?
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Regarding the issue of how copies of the std::function behave, a quick test indicates that copies of the internal callable object are done, rather than sharing the state.
// g++4.8
int main() {
int value = 5;
typedef std::function<void()> fun;
fun f1 = [=]() mutable { std::cout &...
How do I base64 encode (decode) in C?
...mplementation performs well in C++, it can easily be backported to C. Also tests were conducted using Visual Studio 2015. If somebody wants to update this answer with results from clang/gcc, be my guest.
FASTEST ENCODERS:
The two fastest encoder implementations I found were Jouni Malinen's at http...
How to dynamically create CSS class in JavaScript and apply?
...ment.className = element.className + " " + name;
}
}
Here's a little test page as well: https://gist.github.com/shadybones/9816763
The key little bit is the fact that style elements have a "styleSheet"/"sheet" property which you can use to to add/remove rules on.
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How can I convert an RGB image into grayscale in Python?
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Three of the suggested methods were tested for speed with 1000 RGBA PNG images (224 x 256 pixels) running with Python 3.5 on Ubuntu 16.04 LTS (Xeon E5 2670 with SSD).
Average run times
pil : 1.037 seconds
scipy: 1.040 seconds
sk : 2.120 seconds
PIL and ...
How to read the content of a file to a string in C?
...e more tricky, and unfortunately I don't have a compiler in front of me to test, but the functionality is provided by CreateFileMapping() and MapViewOfFile().
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String concatenation in Ruby
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The + operator is the normal concatenation choice, and is probably the fastest way to concatenate strings.
The difference between + and << is that << changes the object on its left hand side, and + doesn't.
irb(main):001:0> s = 'a'
=> "a"
irb(main):002:0> s + 'b'
=> "ab"
i...
Join/Where with LINQ and Lambda
...IN condition; you don't need to use WHERE clause!": the WHERE clause isn't testing equality between ID fields, it's testing equality between the post ID column and the id parameter declared outside the query.
– Daniel Schaffer
May 27 '13 at 15:45
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