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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...t just eats up bytes for no reason and potentially increases cache misses, etc.
The noise it makes pretty much makes timing micro-optimizations
impossible.
How can I make sure that such accidental lucky / unlucky alignments
are not interfering when I do micro-optimizations (unrelated to...
How to write to a file in Scala?
...se a helper function:
/**
* Used for reading/writing to database, files, etc.
* Code From the book "Beginning Scala"
* http://www.amazon.com/Beginning-Scala-David-Pollak/dp/1430219890
*/
def using[A <: {def close(): Unit}, B](param: A)(f: A => B): B =
try { f(param) } finally { param.clos...
Convert base-2 binary number string to int
...'{0b1011010:#0}')
>>> bin_2_decimal
90
binary to octal hexa and etc.
>>> f'{0b1011010:#o}'
'0o132' # octal
>>> f'{0b1011010:#x}'
'0x5a' # hexadecimal
>>> f'{0b1011010:#0}'
'90' # decimal
Pay attention to 2 piece of information separated by colon.
I...
How to execute a raw update sql with dynamic binding in rails
...ure if there are other ramifications to doing this (connections left open, etc). I would trace the Rails code for a normal update to see what it's doing aside from the actual query.
Using prepared queries can save you a small amount of time in the database, but unless you're doing this a million ti...
Where to place AutoMapper.CreateMaps?
...
{
Mapper.CreateMap<User,UserViewModel>();
}
// ... etc
}
We create a method for each "aggregate" (User, Post), so things are separated nicely.
Then your Global.asax:
AutoMapperWebConfiguration.Configure();
AutoMapperServicesConfiguration.Configure();
AutoMapperDomainConfi...
几个有趣的Javascript Hack - 创意 - 清泛网 - 专注C/C++及内核技术
几个有趣的Javascript Hack在网上看到几个有意思的Javascript代码，和大家分享一下。1. 直接在浏览器中编辑网页内容javascript：document.body.contentEditable='...在网上看到几个有意思的Javascript代码，和大家分享一下。
1. 直接在浏览器中...
MFC SysLink的使用方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
MFC SysLink的使用方法MFC中有一个SysLink Control的控件，用于在 MFC 应用程序上添加超链接。下面说一下简单的使用方法：1、 首先建立一个基于对话框的MFC工...MFC中有一个 SysLink Control 的控件，用于在 MFC 应用程序上添加超链接。下...
error: ‘std::ios_base::ios_base(const std::ios_base&)’ is private ...
...basic_ostream(const std::basic_ostream&)’ first required here这个错误的原因大概是std::ios_base类的拷贝构造函数是私有的，从return s语句返回时缺少一个合成的构造拷贝构造函数完成流的复制。错误代...这个错误的原因大概是std::ios_base类的...
VC 对话框背景色覆盖CEdit背景色的解决方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
VC 对话框背景色覆盖CEdit背景色的解决方法对话框不设置背景色时，CEdit自绘背景色正常（CEdit自绘请参考《MFC CEdit自绘、MFC圆角输入框》），但是对话框如何在OnCtlColor中设置背...对话框不设置背景色时，CEdit自绘背景色正常（CEd...
XML中的转义字符 - C/C++ - 清泛网 - 专注C/C++及内核技术
XML中的转义字符XML实体中不允许出现"&","<",">"等特殊字符,否则XML语法检查时将出错,如果编写的XML文件必须包含这些字符,则必须分别写成"&","<",">"再...XML实体中不允许出现"&","<",">"等特殊字符,否则XML语法检查时将出错,如果编写...