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Why does Math.round(0.49999999999999994) return 1?
...s exactly 1 in double precision:
static void print(double d) {
System.out.printf("%016x\n", Double.doubleToLongBits(d));
}
public static void main(String args[]) {
double a = 0.5;
double b = 0.49999999999999994;
print(a); // 3fe0000000000000
print(b); // 3fdfffffffff...
Can I set a breakpoint on 'memory access' in GDB?
...r hardware or software support. Software is obviously much slower. To find out if your OS supports hardware watchpoints you can see the can-use-hw-watchpoints environment setting.
gdb$ show can-use-hw-watchpoints
Debugger's willingness to use watchpoint hardware is 1.
...
Determining 32 vs 64 bit in C++
... own representation. I prefer ENVIRONMENT64 / ENVIRONMENT32. Then I find out what all of the major compilers use for determining if it's a 64 bit environment or not and use that to set my variables.
// Check windows
#if _WIN32 || _WIN64
#if _WIN64
#define ENVIRONMENT64
#else
#define ENVIRONMENT...
Running a specific test case in Django when your app has a tests directory
...
Checkout django-nose. It allows you to specify tests to run like:
python manage.py test another.test:TestCase.test_method
or as noted in comments, use the syntax:
python manage.py test another.test.TestCase.test_method
...
How can I measure the speed of code written in PHP? [closed]
... ; Profiling activated when requested by the GET parameter
xdebug.profiler_output_dir = /tmp/ouput_directory
xdebug.profiler_output_name = files_names
(Read the documentation for more informations)
This screenshot is from a C++ program in KcacheGrind :
(source: sourceforge.net)
You'll get exactl...
Bash, no-arguments warning, and case decisions
...the message would be some help text. But I'm sure Werner is able to figure out what that line does and whether he wants it :)
– Thomas
Mar 11 '10 at 19:42
...
Reading a binary file with python
...is case I don't know the byte structure in details. For example, I figured out that sometimes there is the integer 8. However, with IDL it is really simple to read this data. Can I do the same with python?
– Brian
Jan 4 '12 at 9:45
...
Postgres: “ERROR: cached plan must not change result type”
...my application.
Does anyone know what this error means and what I can do about it?
3 Answers
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What is the difference between Fragment and FragmentActivity?
...o be embedded in an Activity it doesn't have to be part of the Activity layout. It can be used as an invisible worker for the activity, with no UI of its own.
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Controlling the screenshot in the iOS 7 multitasking switcher
...ou might also want to look into the appropriate setting of allowScreenShot outlined in the Restrictions Payload section of the Configuration Profile Reference.
Here is an implementation that achieves what I needed. You can present your own UIImageView, or your can use a delegate-protocol pattern ...