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When to use volatile with multi threading?
... etc. One note in the standard even points the connection to hardware:
http://eel.is/c++draft/intro.races#19
[ Note: The four preceding coherence requirements effectively disallow compiler reordering of atomic operations to a single object, even if both operations are relaxed loads. This ef...
When should you not use virtual destructors?
...ism, even if its destructor were virtual:
class MutexLock {
mutex *mtx_;
public:
explicit MutexLock(mutex *mtx) : mtx_(mtx) { mtx_->lock(); }
~MutexLock() { mtx_->unlock(); }
private:
MutexLock(const MutexLock &rhs);
MutexLock &operator=(const MutexLock &rhs);
...
How to animate the change of image in an UIImageView?
...
Try this:
_imageView.image = image;
[_imageView.layer addAnimation:[CATransition animation] forKey:kCATransition];
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Extract month and year from a zoo::yearmon object
... I'd add a zoo-free answer for ts as well.
# create an example Date
date_1 <- as.Date("1990-01-01")
# extract year
as.numeric(format(date_1, "%Y"))
# extract month
as.numeric(format(date_1, "%m"))
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What differences, if any, between C++03 and C++11 can be detected at run-time?
...led with a C++ compiler, will return 1 (the trivial sulution with
#ifdef __cplusplus is not interesting).
8 Answers
...
How do I write JSON data to a file?
...a is a dictionary and not yet JSON-encoded. Write it like this for maximum compatibility (Python 2 and 3):
import json
with open('data.json', 'w') as f:
json.dump(data, f)
On a modern system (i.e. Python 3 and UTF-8 support), you can write a nicer file with
import json
with open('data.json',...
App Inventor 2 SemiCircleArc 扩展：高级自定义半圆进度条 · App Inventor 2 中文网
...：
when Screen1.Initialize() {
SemiCircleArc1.Initialize(垂直布局_进度)
SemiCircleArc1.ShowProgressText = true
SemiCircleArc1.LabelText = "加载中"
SemiCircleArc1.ProgressBarGradient(&HFF42A5F5, &HFF7E57C2)
SemiCircleArc1.BackgroundGradient(&HFFE0E0E0, &HFFF5F5F5)
SemiCircleArc...
How to remove “disabled” attribute using jQuery?
....preventDefault();
$('.inputDisabled').removeAttr("disabled")
});
http://jsfiddle.net/ZwHfY/
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What's the difference between Unicode and UTF-8? [duplicate]
...tire set of standards for character encoding. Unicode is not an encoding!
http://en.wikipedia.org/wiki/Unicode#Unicode_Transformation_Format_and_Universal_Character_Set
and of course, the obligatory Joel On Software - The Absolute Minimum Every Software Developer Absolutely, Positively Must Know A...
Program only crashes as release build — how to debug?
...o a program. You can turn the debug heap off by using environment variable _NO_DEBUG_HEAP . You can specify this either in your computer properties, or in the Project Settings in Visual Studio. That might make the crash reproducible with the debugger attached.
More on debugging heap corruption her...