大约有 30,000 项符合查询结果（耗时：0.0443秒） [XML]
When is “i += x” different from “i = i + x” in Python?
...
This depends entirely on the object i.
+= calls the __iadd__ method (if it exists -- falling back on __add__ if it doesn't exist) whereas + calls the __add__ method1 or the __radd__ method in a few cases2.
From an API perspective, __iadd__ is supposed to be used f...
Make Https call using HttpClient
I have been using HttpClient for making WebApi calls using C#. Seems neat & fast way compared to WebClient . However I am stuck up while making Https calls.
...
How do malloc() and free() work?
...loc looks at when a new chunk of memory is needed. It is scanned before it calls for new memory from the OS. When a chunk is found that is bigger than the needed memory, it is divided into two parts. One is returned to caller, the other is put back into the free list.
There are many different optim...
Finding Variable Type in JavaScript
...e the output of Object.prototype.toString:
> Object.prototype.toString.call([1,2,3])
"[object Array]"
> Object.prototype.toString.call("foo bar")
"[object String]"
> Object.prototype.toString.call(45)
"[object Number]"
> Object.prototype.toString.call(false)
"[object Boolean]"
> Obje...
How to specify the private SSH-key to use when executing shell command on Git?
...ve the key loaded.
Alternatively, setting HOME may also do the trick, provided you are willing to setup a directory that contains only a .ssh directory as HOME; this may either contain an identity.pub, or a config file setting IdentityFile.
...
Why do we need a pure virtual destructor in C++?
...s foof : public foo {
void bar() { foo::bar(); } // have to explicitly call default implementation.
};
share
|
improve this answer
|
follow
|
...
How does RegexOptions.Compiled work?
... linked list. If you happen to increase it to 5000, and use 5000 different calls on the static helpers, every regular expression construction will crawl the 5000 entries to see if it has previously been cached. There is a lock around the check, so the check can decrease parallelism and introduce thr...
When do I use a dot, arrow, or double colon to refer to members of a class in C++?
... type". So the above refers to all three of them.
References are, semantically, aliases to objects, so I should have added "or reference to a pointer" to the #3 as well. However, I thought this would be more confusing than helpful, since references to pointers (T*&) are rarely ever used.
The d...
Do asynchronous operations in ASP.NET MVC use a thread from ThreadPool on .NET 4
...chronous processing in ASP.NET (which is what asynchronous controllers basically represent).
Let's first consider a standard synchronous action:
public ActionResult Index()
{
// some processing
return View();
}
When a request is made to this action a thread is drawn from the thread pool ...
converting a .net Func to a .net Expression
Going from a lambda to an Expression is easy using a method call...
9 Answers
9
...