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What's the difference between the atomic and nonatomic attributes?

...o are identical; "atomic" is the default behavior (note that it is not actually a keyword; it is specified only by the absence of nonatomic -- atomic was added as a keyword in recent versions of llvm/clang). Assuming that you are @synthesizing the method implementations, atomic vs. non-atomic chang...
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How to move up a directory with Terminal in OS X

When I launch a new Terminal window, it starts me in 'Macintosh HD/Users/MyName'. How can I back out of my user directory, back up to the top level? ...
https://www.tsingfun.com/it/cpp/2092.html 

error C2440: “return”: 无法从“const Screen”转换为“Screen &” - C/...

...错代码(例子来自c++ primer 4th):Screen& Screen::display(std::ostream& os) const{ os << contents...转换丢失限定符。 出错代码(例子来自c++ primer 4th): Screen& Screen::display(std::ostream& os) const { os << contents << '\n'; return *this; } 解决...
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动态创建对象的拓展:[url]https://community.kodular.io/t/f-os-dynamic-c...

动态创建对象的拓展:https://community.kodular.io/t/f ... onent-2-2-2/50789/2已添加,待翻译优化
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BLE connection error “Connection status was set to OS code 133” - 创...

...我的应用程序的 iPhone 版本从未遇到过这个问题,因为 iOS 似乎会自动协商更大的 MTU 大小。这似乎是个好主意。23 字节的限制不再很有用。
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【解决】java.lang.ArrayIndexOutOfBoundsException: length=1; index=-1 a...

...handleMessage(chromium-SystemWebView.apk-default-495156106:208) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:8060) at java.lang.reflect.Method.i...
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Why does Vim save files with a ~ extension?

... Actually - do I have to have both nobackup and nowritebackup? Is there a way to write a copy of the file as a backup, but not do this write/delete/rename stuff? – Merlyn Morgan-Graham Mar 2...
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How to print the ld(linker) search path

...he spot. I have a linking problem, during linking process linker finds manually installed libraries in /usr/local/.. which causes missing library error, and linking fails. I have to rename /usr/local everytime to exclude that search path. Is there a simple way to exclude or override /usr/local path?...
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Why is unsigned integer overflow defined behavior but signed integer overflow isn't?

...to implement with the integer representation it used. C implementations usually used the same representation used by the CPU - so the overflow behavior followed from the integer representation used by the CPU. In practice, it is only the representations for signed values that may differ according to...
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Download large file in python with requests

...I'd like to use it for download big files (>1GB). The problem is it's not possible to keep whole file in memory I need to read it in chunks. And this is a problem with the following code ...