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C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
...ount *Ref() {
++cnt_;
return this;
}
void Deref() {
if (--cnt_ == 0) {
delete this;
}
}
private:
std::unique_ptr<T> ptr_;
std::atomic_uint32_t cnt_;
};
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每一次的读取操作对应引用计数中增加的数值 1；
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What is the purpose of the single underscore “_” variable in Python?
...ases above). For example year,month,day = date() will raise a lint warning if the day variable is not used later on in the code, the fix if the day is truly not needed is to write year,month,_ = date(). Same with lambda functions, lambda arg: 1.0 is creating a function requiring one argument but not...
File Upload ASP.NET MVC 3.0
... public ActionResult Index(HttpPostedFileBase file)
{
// Verify that the user selected a file
if (file != null && file.ContentLength > 0)
{
// extract only the filename
var fileName = Path.GetFileName(file.FileName);
// s...
How to check if the string is empty?
... they are considered false in a Boolean context, so you can just do this:
if not myString:
This is the preferred way if you know that your variable is a string. If your variable could also be some other type then you should use myString == "". See the documentation on Truth Value Testing for ot...
How to pass parameters in GET requests with jQuery
...low.com/questions/41192531/…. I progressed on this Q much further, where now I call a jquery dialog and call ajax to retrieve data from mysql. I am missing the link on how to retrieve the unique ID associated with each datapoint click. Appreciate if you can help me out. Thank you
...
How to get a reference to current module's attributes in Python
...n't know what you're trying to do, but you may want to rethink your design if you need that.
– Maciej Pasternacki
Jul 24 '12 at 14:37
...
MySQL: determine which database is selected?
...
@cwallenpoole how about now?
– Nordle
Oct 23 '18 at 13:00
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show 1 more comment
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BaseException.message deprecated in Python 2.6
...
Using str breaks if the exception was constructed with a unicode argument: str(MyException(u'\xe5')) raises UnicodeEncodeError. Using unicode instead of str isn't foolproof either because unicode(MyException('\xe5')) raises UnicodeDecodeError...
How to get name of exception that was caught in Python?
...
Here are a few different ways to get the name of the class of the exception:
type(exception).__name__
exception.__class__.__name__
exception.__class__.__qualname__
e.g.,
try:
foo = bar
except Exception as exception:
assert type(...
delete word after or around cursor in VIM
I'm now switching to VIM from TextMate. I found ^+W in INSERT mode very useful. However, I'd like to delete not only the word before cursor, but the word after or around cursor as well.
...