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Ternary operator is twice as slow as an if-else block?
...llows the X64 JIT to perform the inner loop entirely using registers aside from loading i from the array, while the X86 JIT places several stack operations (memory access) in the loop.
value is a 64-bit integer, which requires 2 machine instructions on X86 (add followed by adc) but only 1 on X64 (ad...
线程访问窗口资源的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...threaded application, it is likely that
// you have passed a C++ object from one thread to another
// and have used that object in a way that was not intended.
// (only simple inline wrapper functions should be used)
//
// In general, CWnd objects should be passed by HWND from
// o...
Unicode equivalents for \w and \b in Java regular expressions?
...erties, too. It now tracks The Unicode Standard, in both RL1.2 and RL1.2a from UTS#18: Unicode Regular Expressions. This is an exciting and dramatic improvement, and the development team is to be commended for this important effort.
Java’s Regex Unicode Problems
The problem with Java regexes ...
How does IPython's magic %paste work?
...
I think it depends on the environment from which you are doing the pasting and how you are doing the pasting? My colleague is using Windows 10's command prompt to SSH into our Linux host, opens ipython in a Docker container there and tries to paste already-indent...
What is “incremental linking”?
...
Linking involves packaging together all of the .obj files built from your source files, as well as any .lib files you reference, into your output (eg .exe or .dll).
Without incremental linking, this has to be done from scratch each time.
Incremental linking links your exe/dll in a way w...
Effect of a Bitwise Operator on a Boolean in Java
...nswers, it's worth noting that && and || have different precedence from & and |.
Extract from the precedence table (with highest precedence at the top).
bitwise AND &
bitwise exclusive OR ^
bitwise inclusive OR |
logical AND &&
...
Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
...maphore - no recursion or inheritance, acts as a coherent resource counter from any desired initial count, threads only block where net count against the resource is zero.
Again, this varies somewhat by platform - especially what they call these things, but this should be representative of the con...
Android: Why does long click also trigger a normal click?
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From Event Listeners:
onLongClick() - This returns a boolean to indicate whether you have consumed the event and it should not be carried further. That is, return true to indicate that you have handled the event and it sh...
How to import existing Git repository into another?
... copying the files with cp and committing the result.
Original source was from github's "Subtree Merge" help article. And another useful link.
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Rename Files and Directories (Add Prefix)
... the paramerter-replacing option of xargs: -I. And you can get more detail from the man page.
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