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What should main() return in C and C++?
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64
reentering main is not valid C++. Explicitly in the standard, 3.6.1.3 states 'main shall not be used within a program'
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Get MIME type from filename extension
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Samuel NeffSamuel Neff
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How does the Windows Command Interpreter (CMD.EXE) parse scripts?
...the current folder and the PATH for a .COM, .EXE, .BAT, or .CMD file whose base name matches the original command token
If the first matching file is a .BAT or .CMD, then goto 7.3.exec and execute that script
Else (match not found or first match is .EXE or .COM) execute the remembered internal com...
How to find list of possible words from a letter matrix [Boggle Solver]
...Rosenfield
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14
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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
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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?
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Samuel NeffSamuel Neff
64.8k1616 gold badges120120 silver badges163163 bronze badges
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Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...据硬件配置及设备特性自己设定，没有统一标准，可以为64M，也可以为128M等；它的配置是在Android的属性系统的/system/build.prop中配置dalvik.vm.heapsize=128m即可，若存在dalvik.vm.heapstartsize则表示初始申请大小），也即一个应用进程同时...