大约有 40,000 项符合查询结果（耗时：0.0463秒） [XML]
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
...aking the assumption that unsigned numbers will be used). Thus, to store a raw stream ~3.5M of RAM will be needed. Somebody already said it doesn't seem to be feasible, but I would say the task can be solved if the input is "good enough". Basically, the idea is to compress the input data with compre...
NOT using repository pattern, use the ORM as is (EF)
...y pattern. I cannot stress this enough! This is something that one has to crawl through the mud to figure out. There will always be that one query that breaks your perfectly thought out repository/solution that you've created, and it's not until that point where you second guess yourself and the tec...
How do we control web page caching, across all browsers?
... this:
Cache-Control: no-store
<body onunload="">
Below shows the raw logs of my tests:
HTTP:
Cache-Control: private, no-cache, no-store, must-revalidate, max-age=0, proxy-revalidate, s-maxage=0
Expires: 0
Pragma: no-cache
Vary: *
<body onunload="">
Fail: Opera 12.15
Success: Chrom...
The definitive guide to form-based website authentication [closed]
...ly hacked, leaked or gleaned through SQL injection, and if you are storing raw, plaintext passwords, that is instant game over for your login security.
So if you can't store the password, how do you check that the login+password combination POSTed from the login form is correct? The answer is hashin...
JavaScript + Unicode regexes
...thanks to @modiX and @Lwangaman for the improvements).
Here's the source (raw, 27.5KB; minified, 24.9KB, not much better...). It might be made smaller by unescaping the unicode characters, but OTOH will run the risk of encoding issues, so I'm leaving as it is. Hopefully with ES6 this kind of thing ...
Why does modern Perl avoid UTF-8 by default?
...". Your program appears to work (because the other end usually handles the raw Perl characters correctly), but it is very broken and could stop working at any moment. Fix it with an explicit Encode::encode!
The second problem is UTF-8 encoded source code. Unless you say use utf8 at the top of each ...
data.table vs dplyr: can one do something well the other can't or does poorly?
...e dplyr for expressiveness on medium data;
feel free to use data.table for raw speed on bigger data.
The flexibility of dplyr also means that you can easily tweak performance
characteristics using the same syntax. If the performance of dplyr with
the data frame backend is not good enough for you, y...
What is move semantics?
...op and discuss a simplified version of unique_ptr. First, we encapsulate a raw pointer and overload the operators -> and *, so our class feels like a pointer:
template<typename T>
class unique_ptr
{
T* ptr;
public:
T* operator->() const
{
return ptr;
}
T&a...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...* or non-page data.
*
* Not only UDP, other transport protocols - e.g. raw sockets - can use
* this interface potentially.
*
* LATER: length must be adjusted by pad at tail, when it is required.
*/
int ip_append_data(struct sock *sk, struct flowi4 *fl4,
int getfrag(void *from, cha...
PostgreSQL - fetch the row which has the Max value for a column
...uted between 0 and 10k, trans_id uniformly distributed between 0 and 30),
By query cost, below, I am referring to Postgres' cost based optimizer's cost estimate (with Postgres' default xxx_cost values), which is a weighed function estimate of required I/O and CPU resources; you can obtain this by f...