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Is it better to use std::memcpy() or std::copy() in terms to performance?
...e run of SHA-2 tests
std::copy memcpy % increase
6.11 6.29 2.86%
6.09 6.28 3.03%
6.10 6.29 3.02%
6.08 6.27 3.03%
6.08 6.27 3.03%
Total average increase in speed of std::copy over memcpy: 2.99%
My compiler is gcc 4.6.3 on Fedora 16 x86_64. My o...
What is the effect of extern “C” in C++?
...library given only a header file and pick the right function to load. (On x86, there's a published name-mangling specification in the form of the Itanium ABI that all x86 compilers I know of use to mangle C++ function names, but nothing in the language requires this.)
– Jonatha...
Get Character value from KeyCode in JavaScript… then trim
...sn't even work with basic characters. Semicolon keyCode , for example, is 186, run a String.fromCharCode() on it and you will get garbage. The problem is that keyCode does not correspond to ASCII for all characters. The ASCII character for semicolon is 59. Same issue is true of every special charact...
C++虚继承的概念 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的问题。
class 派生类名：virtual 继承方式 基类名
virtual是关键字，声明该基类为派生类的虚基类。
在多继承情况下，虚基类关键字的作用范围和继承方式关键字相同，只对紧跟其后的基类起作用。
声明了虚基类之后，虚基...
What's the best way to get the last element of an array without deleting it?
...4 | 78 | 85 | 80 | 155 | 86.141 ||
|| 3. $x = array_pop((array_slice($array, -1))); || 724 | 228 | 323 | 318 | 350 | 673 | 1.042.263 || 988 | 2...
开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...物联网等各类关键业务场景。EMQX 采用 Erlang/OTP 编写，这是一种用于构建大规模可扩展软实时系统的编程语言。与 Mosquitto 不同，EMQX 在设计之初即采用了分布式集群架构，可以轻松实现弹性水平扩展，从而稳定承载大规模的 MQTT ...
std::vector performance regression when enabling C++11
...'./a.out' (10 runs):
35.426793 task-clock # 0.986 CPUs utilized ( +- 1.75% )
4 context-switches # 0.116 K/sec ( +- 5.69% )
0 CPU-migrations # 0.006 K/sec ( +- 66...
Java Swing revalidate() vs repaint()
...
86
Any time you do a remove() or a removeAll(), you should call
validate();
repaint();
afte...
How can I account for period (AM/PM) using strftime?
...
MattDMo
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answered Nov 18 '09 at 22:07
Ned Batche...