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C++ performance challenge: integer to std::string conversion
...; 32) + (k));
}
template <typename T>
std::string itostr(T o) {
union {
char str[16];
unsigned short u2[8];
unsigned u4[4];
unsigned long long u8[2];
};
unsigned v = o < 0 ? ~o + 1 : o;
u8[0] = (ull(v) * 3518437209u) >> 45;
u8[0] ...
How are ssl certificates verified?
...the steps they take to safeguard their cert issuance, then importing their root cert is safe.
– nsayer
Apr 8 '09 at 23:36
6
...
Why is  appearing in my HTML? [duplicate]
...
Try:
<?php
// Tell me the root folder path.
// You can also try this one
// $HOME = $_SERVER["DOCUMENT_ROOT"];
// Or this
// dirname(__FILE__)
$HOME = dirname(__FILE__);
// Is this a Windows host ? If it is, change this line to $WIN = 1;
$WIN = 0;
/...
Big-O for Eight Year Olds? [duplicate]
.... As a rough category, I would include algorithms such as hash lookups and Union-Find here, even though neither of those are actually O(1).
O(log(n)) "logarithmic" - it gets slower as you get larger inputs, but once your input gets fairly large, it won't change enough to worry about. If your runtime...
PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI
... The filename of the currently executing script, relative to the document root. For instance, $_SERVER['PHP_SELF'] in a script at the address http://example.com/test.php/foo.bar would be /test.php/foo.bar. The __FILE__ constant contains the full path and filename of the current (i.e. included) file...
Good examples of MVVM Template
...on, and overall I like Unity quite a bit.
Usually, it makes sense for the root window to subscribe to this event - it can open the dialog and set its data context to the ViewModel that gets passed in with a raised event.
Setting this up in this way lets ViewModels ask the application to open a dia...
记一次数据库表自增长（Auto Increment）故障 - 数据库(内核) - 清泛网 - ...
...EMENT = 123;
此方法无疑能够达到目的，但有一个缺点：在 MySQL 中，当 ALTER 一个表时，实际上相当于重新创建了一次表！如果原本数据就很大的话，这个过程将非常缓慢。
让我们再来考虑考虑其它方法，既然问题出在唯一标识的...
UINavigationBar custom back button without title
...every view controller so that the back button displays back instead of the root view controller name
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
Swift 2
self.navigationItem.backBarButtonItem = UIBarButt...
Android mock location on device?
...Maybe it is possible with a terminal application but I think that requires root access
– Janusz
Apr 6 '10 at 18:49
Jus...
How to tell if a file is git tracked (by shell exit code)?
...results(logs). Else it is empty.
For example if the file is git tracked,
root@user-ubuntu:~/project-repo-directory# git log src/../somefile.js
commit ad9180b772d5c64dcd79a6cbb9487bd2ef08cbfc
Author: User <someone@somedomain.com>
Date: Mon Feb 20 07:45:04 2017 -0600
fix eslint indentat...