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Is it better to use std::memcpy() or std::copy() in terms to performance?
...do exactly what you ask.
See this presentation on compiler optimisations (pdf).
Here's what GCC does for a simple std::copy of a POD type.
#include <algorithm>
struct foo
{
int x, y;
};
void bar(foo* a, foo* b, size_t n)
{
std::copy(a, a + n, b);
}
Here's the disassembly (with o...
Simple explanation of MapReduce?
...tion of MapReduce, see: Google's MapReduce Programming Model -- Revisited (PDF).
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融资千万美元后的足记要如何应对“爆款后遗症”？ - 资讯 - 清泛网 - 专注C...
...之后，实际上做的是业务流程、交互流程。我大概是中国第一个做彩信交互产品的产品经理。”信主的杨柳认为这一切自有安排。
足记的口号是“像电影一样生活”，通过简单的方式把生活电影化，做这个文艺产品，却让杨柳...
In which order should floats be added to get the most precise result?
...ere are still brick-and-mortar libraries around. Alternatively, buying the PDF online costs $5-$15 (depending on whether you're an ACM member). Lastly, DeepDyve seem to be offering to lend the paper for 24 hours for $2.99 (if you're new to DeepDyve, you might even be able to get it for free as part ...
What's the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__?
...ction_name
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1208r5.pdf went into C++20, so we have yet another way to do it.
The documentation says:
constexpr const char* function_name() const noexcept;
6 Returns: If this object represents a position in the body of a function,
returns an im...
Group vs role (Any real difference?)
...rence between roles and groups.
http://profsandhu.com/workshop/role-group.pdf
A group is a collection of users with a given set of permissions assigned to the group (and transitively, to the users). A role is a collection of permissions, and a user effectively inherits those permissions when he ac...
How can I view the source code for a function?
...repository or Winston Chang's github mirror.
Uwe Ligges's R news article (PDF) (p. 43) is a good general reference of how to view the source code for .Internal and .Primitive functions. The basic steps are to first look for the function name in src/main/names.c and then search for the "C-entry" na...
What is the formal difference in Scala between braces and parentheses, and when should they be used?
...e Scala Style Guide (page 21): http://www.codecommit.com/scala-style-guide.pdf
The recommended syntax for higher order methods calls is to always use braces, and to skip the dot:
val filtered = tupleList takeWhile { case (s1, s2) => s1 == s2 }
For "normal" metod calls you should use the dot a...
糯米推全景地图 让竞争对手们如何接招？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...分地满足了用户的需要、预知需要和选择需要。
再回到第一句话的话题，技术时代的O2O竞争来了，百度糯米推出全景地图，新美大该如何应对呢？腾讯和阿里该如何应对呢？
我不知道现在该如何笼统地称呼新美大、腾讯、阿...
剖析程序的内存布局 - C/C++ - 清泛网 - 专注C/C++及内核技术
...中大部分例子取自32位x86平台的Linux和Windows系统。本系列第一篇文章讲述应用程序的内存布局。
在多任务操作系统中的每一个进程都运行在一个属于它自己的内存沙盘中。这个沙盘就是虚拟地址空间（virtual address space），...