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mmap() vs. reading blocks
... more-or-less also includes the case where the file wasn't fully cached to start with, but where the OS read-ahead is good enough to make it appear so (i.e., the page is usually cached by the time you want it). This is a subtle issue though because the way read-ahead works is often quite different b...
insert vs emplace vs operator[] in c++ map
...e only two: operator[] and insert (different flavors of insert). So I will start explaining those.
The operator[] is a find-or-add operator. It will try to find an element with the given key inside the map, and if it exists it will return a reference to the stored value. If it does not, it will cre...
Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
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When we scroll , label starts taking appearing in multiple lines and row's height also dowsn't increase
– Karanveer Singh
Jun 18 '19 at 7:00
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Schema for a multilanguage database
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This is an interesting issue, so let's necromance.
Let's start by the problems of method 1:
Problem: You're denormalizing to save speed.
In SQL (except PostGreSQL with hstore), you can't pass a parameter language, and say:
SELECT ['DESCRIPTION_' + @in_language] FROM T_Products
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Callback functions in C++
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I know this is old, but because I almost started doing this and it ended up not working on my setup (mingw), if you're using GCC version < 4.x, this method is not supported. Some of the dependencies I'm using won't compile without a lot of work in gcc version &g...
Unicode equivalents for \w and \b in Java regular expressions?
...iles as matching /^(\X*\R)*\R?$/, but you can’t if you have a \pM at the start of the file, or even of a line. So they’ve eXtended it to always match at least one character. It always did, but now it makes the above pattern work. […continued…]
– tchrist
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Node.js Best Practice Exception Handling
I just started trying out node.js a few days ago. I've realized that the Node is terminated whenever I have an unhandled exception in my program. This is different than the normal server container that I have been exposed to where only the Worker Thread dies when unhandled exceptions occur and the c...
REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...58.22.96.66
修改后不要忘记了重启网络服务
service network restart
3、/etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.8.106 redhat #新增加
/...
How does the “this” keyword work?
...roduction to the concepts of this and scope chains in JavaScript.
Once you start getting used to this, the rules are actually pretty simple. The ECMAScript 5.1 Standard defines this:
§11.1.1 The this keyword
The this keyword evaluates to the value of the ThisBinding of the current execution contex...
Where and why do I have to put the “template” and “typename” keywords?
...eds to be a dependent name (fortunately, as of mid C++14 the committee has started to look into how to fix this confusing definition).
To avoid this problem, I have resorted to a simple interpretation of the Standard text. Of all the constructs that denote dependent types or expressions, a subset ...