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Type erasure techniques
...plementations, or you could store the data elsewhere (e.g. in a separately allocated buffer), and just have the derived class provide the virtual function implementations, which take a void* that points to the data. If you store the data in a separate buffer, then you could use function pointers rat...
JQuery: 'Uncaught TypeError: Illegal invocation' at ajax request - several elements
...instead of its value, which is actually what I wanted to do (in fact in my php code I need that value as a foreign key for querying my cities table and filter correct entries).
So, instead of:
var data = {
'mode': 'filter_city',
'id_A': e[e.selectedIndex]
};
it should be:
var da...
SHA1 vs md5 vs SHA256: which to use for a PHP login?
I'm making a php login, and I'm trying to decide whether to use SHA1 or Md5, or SHA256 which I read about in another stackoverflow article. Are any of them more secure than others? For SHA1/256, do I still use a salt?
...
Running Bash commands in Python
...A common mistake is to use shell=True and then still pass Python a list of tokens, or vice versa. This happens to work in some cases, but is really ill-defined and could break in interesting ways.
# XXX AVOID THIS BUG
buggy = subprocess.run('dig +short stackoverflow.com')
# XXX AVOID THIS BUG TOO
...
AfxIsValidAddress 测试内存地址 - C/C++ - 清泛网 - 专注C/C++及内核技术
...则返回值为0.
Remarks
The address is not restricted to blocks allocated by new.
地址不仅限于模块分配新的地址。
Example
// Allocate a 5 character array, which should have a valid memory address.
char* arr = new char[5];
// Create a null pointer, which should ...
Double not (!!) operator in PHP
What does the double not operator do in PHP?
6 Answers
6
...
How can I use Guzzle to send a POST request in JSON?
... this will not work when you have to send headers, f.e. authorization tokens for git. you have to instantiate a Request object and use the send or request function
– clockw0rk
Aug 17 at 12:42
...
Logical Operators, || or OR?
...nlike many other languages where they return the last value checked. So in PHP (27 || 0) returns true, not 27.
– TextGeek
Sep 15 '17 at 15:32
...
How to monitor the memory usage of Node.js?
..., heapTotal: 11803648, heapUsed: 4530208 }
> var a = new Array(1e7); // Allocate memory for 10m items in an array
undefined
> process.memoryUsage(); // Memory after allocating so many items
{ rss: 102535168, heapTotal: 91823104, heapUsed: 85246576 }
> a = null; // Allow the a...
What is the difference/usage of homebrew, macports or other package installation tools? [closed]
... a problem with it, and my entire Unix ecosystem relay on it.
If you are a PHP developer you can install the last version of Apache (Mac OS X uses 2.2), PHP and all the extensions you need, then upgrade all with one command. Forget to do the same with Homebrew.
MacPorts support groups.
foo@macpro:~...