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Is it better to use std::memcpy() or std::copy() in terms to performance?
...ays was passed in to the function as a function parameter.
I did a little bit more testing to see what I could do to make std::copy faster again. The answer turned out to be simple: turn on link time optimization. These are my results with LTO turned on (option -flto in gcc):
Time (in seconds) to ...
“:” (colon) in C struct - what does it mean? [duplicate]
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Those are bit fields. Basically, the number after the colon describes how many bits that field uses. Here is a quote from MSDN describing bit fields:
The constant-expression specifies the width of the field in bits. The
type-spec...
Render HTML to PDF in Django site
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Man, reportlab is pita to install on windows 7 64bit, python2.7 64bit. Still trying...
– Andriy Drozdyuk
Jul 14 '11 at 18:33
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How to allocate aligned memory only using the standard library?
...nt to round down to the 16-byte boundary — so I want to reset the last 4 bits to 0. 0x0F has the last 4 bits set to one; therefore, ~0x0F has all bits set to one except the last four. Anding that with 0x800011 gives 0x800010. You can iterate over the other offsets and see that the same arithmet...
Win7禁用休眠 减少C盘容量占用 - 脚本技术 - 清泛IT社区，为创新赋能！
开始菜单 → 运行 → cmd.exe → 右键“以管理员身份运行” → 命令：powercfg -h off
回车即可，C盘容量占用减少立即生效。
另外，减少C盘容量占用常见的还有：将虚拟内存位置改到C盘以外。
设置完成后，需要重启计算机方...
分享一款界面简单清爽的404页面 - 源码下载 - 清泛网 - 专注C/C++及内核技术
...04页面下载请戳：https://www.tsingfun.com/html/2016/code_0628/84.htmlWinXP,Win7,Win8,Win10,Linux,MacOS14.7K
Genymotion, “Unable to load VirtualBox engine.” on Mavericks. VBox is setup correctly
I keep getting the following error:
17 Answers
17
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Is “argv[0] = name-of-executable” an accepted standard or just a common convention?
...e standard so an implementation is free to do what it wants, including allowing something in there that isn't the actual name - I thought I'd made that clear in the penultimate sentence.
– paxdiablo
Jan 12 '10 at 23:00
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Real world use cases of bitwise operators [closed]
What are some real world use cases of the following bitwise operators?
41 Answers
41
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Are negative array indexes allowed in C?
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What happens on 64 bit systems (LP64) when you have a 32 bit int index which is negative ? Should the index get promoted to a 64 bit signed int prior to the address calculation ?
– Paul R
Oct 11 '10 at 16:...