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Concurrent vs serial queues in GCD
...s internally-managed pool. As far as the writing of this answer, there are 64 queues available per qos. That may seem like a lot but they can quickly be consumed, especially by third-party libraries, particularly database frameworks. For this reason, Apple has recommendations about queue management ...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...queue_empty(&sk->sk_write_queue)) {
err = ip_setup_cork(sk, &inet->cork.base, ipc, rtp); //sk_write_queue为空，初始化cork
if (err)
return err;
} else {
transhdrlen = 0;
}
return __ip_append_data(sk, fl4, &sk->sk_write_queue, &inet->cork.base, //添加skb到sk_write_queue
...
C++ performance vs. Java/C#
... your c++ compiler will offer for different architectures is usually x86, x64, ARM and whatnot. Now you can tell it to use specific features (say SSE2) and if you're lucky it'll even generate some backup code if that feature isn't available, but that's about as fine-grained as one can get. Certainly...
Regular expression to match non-ASCII characters?
...-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0\u08A2-\u08AC\u0904-\u0939\u0...
List of All Locales and Their Short Codes?
...
Samuel NeffSamuel Neff
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Do I need to explicitly call the base virtual destructor?
...ructor again as virtual on the inheriting class, but do I need to call the base destructor?
7 Answers
...
Will the base class constructor be automatically called?
Would the age of customer be 2? It seems like the base class's constructor will be called no matter what. If so, why do we need to call base at the end sometimes?
...
dynamic_cast and static_cast in C++
...er for the cast to be legal.
Casts can go in one of two directions: from base to derived (B2D) or from derived to base (D2B). It's simple enough to see how D2B casts would work at runtime. Either ptr was derived from Type or it wasn't. In the case of D2B dynamic_cast<>s, the rules are sim...
When to use virtual destructors?
...ght potentially delete an instance of a derived class through a pointer to base class:
class Base
{
// some virtual methods
};
class Derived : public Base
{
~Derived()
{
// Do some important cleanup
}
};
Here, you'll notice that I didn't declare Base's destructor to be v...
Can I call a base class's virtual function if I'm overriding it?
...blic Foo {
// ...
void printStuff() {
Foo::printStuff(); // calls base class' function
}
};
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