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Fast way to get image dimensions (not filesize)
...
I have done some tests with the ImageMagick identify command, using strace to record open/read/mmap/close calls to see how much data was been read from the identified image. It does depend on the file type and file size slightly, but I was ge...
Swift - How to convert String to Double
...ng, and returns nil when the string does not contain a Double value (e.g. "test" will not return 0.0).
let double = NSNumberFormatter().numberFromString(myString)?.doubleValue
Alternatively, extending Swift's String type:
extension String {
func toDouble() -> Double? {
return Numb...
Allow user to set up an SSH tunnel, but nothing else
...rom there you can escape to an unrestricted shell with !/bin/bash. See pen-testing.sans.org/blog/2012/06/06/… for other examples. So allowing individual commands should be done very, very carefully, if at all.
– Fritz
Sep 1 '15 at 17:33
...
Why don't self-closing script elements work?
...t> is not void (it may have content) and is not foreign (like MathML or SVG), <script> cannot be self-closed, regardless of how you use it.
But why? Can't they regard it as foreign, make special case, or something?
HTML 5 aims to be backward-compatible with implementations of HTML 4 and X...
Is there a range class in C++11 for use with range based for loops?
..._(begin), end_(end) {}
private:
iterator begin_;
iterator end_;
};
Test code:
int main() {
int m, n;
std::istringstream in("10 20");
if ( in >> m >> n ) //using in, because std::cin cannot be used at coliru.
{
if ( m > n ) std::swap(m,n);
...
Using the “final” modifier whenever applicable in Java [closed]
...void common cases of a NullPointerException:
final FileInputStream in;
if(test)
in = new FileInputStream("foo.txt");
else
System.out.println("test failed");
in.read(); // Compiler error because variable 'in' might be unassigned
By preventing a variable from being assigned more than once, you ...
How can I negate the return-value of a process?
...at you don't have Bash as your shell (for ex.: git scripts, or puppet exec tests) you can run:
echo '! ls notexisting' | bash
-> retcode: 0
echo '! ls /' | bash
-> retcode: 1
share
|
im...
How to implement Enums in Ruby?
...Ruby's expressive power. To avoid problems, most Ruby programmers practice test-driven design, which will find not just typos but also logic errors.
– emk
Aug 20 '09 at 20:14
10
...
Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell
...n (they aren't the same). If you look in the GHC Base library you see mod tests for several conditions and adjusts the sign accordingly. (see modInt# in Base.lhs)
– Thomas M. DuBuisson
Aug 6 '11 at 5:23
...
What is the relative performance difference of if/else versus switch statement in Java?
...
Use switch!
I hate to maintain if-else-blocks! Have a test:
public class SpeedTestSwitch
{
private static void do1(int loop)
{
int temp = 0;
for (; loop > 0; --loop)
{
int r = (int) (Math.random() * 10);
switch (r)
...