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What does the explicit keyword mean?
...se, you have a class String:
class String {
public:
String(int n); // allocate n bytes to the String object
String(const char *p); // initializes object with char *p
};
Now, if you try:
String mystring = 'x';
The character 'x' will be implicitly converted to int and then the String(int...
Checking if an instance's class implements an interface?
... "Yes!";
}
class_implements() is part of the SPL extension.
See: http://php.net/manual/en/function.class-implements.php
Performance Tests
Some simple performance tests show the costs of each approach:
Given an instance of an object
Object construction outside the loop (100,000 iterations)
_...
how to delete all cookies of my website in php
...
PHP setcookie()
Taken from that page, this will unset all of the cookies for your domain:
// unset cookies
if (isset($_SERVER['HTTP_COOKIE'])) {
$cookies = explode(';', $_SERVER['HTTP_COOKIE']);
foreach($cookies as ...
PHP完美实现GIF动画缩略图 - 更多技术 - 清泛网 - 专注C/C++及内核技术
PHP完美实现GIF动画缩略图缩略图是个很常用的功能。它的实现并不复杂，但如果原图是GIF动画的话，问题就会变得繁琐一点，下面通过一个取自CS警匪游戏的GIF动画来说明...缩略图是个很常用的功能。它的实现并不复杂，但如果...
How can I pretty-print JSON in a shell script?
... do it all in one go with curl on the command line using an authentication token:
curl -X GET -H "Authorization: Token wef4fwef54te4t5teerdfgghrtgdg53" http://testsite/api/ | python -mjson.tool
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Difference between python3 and python3m executables
... will
also contribute to the file name:
--with-pydebug (flag: d)
--with-pymalloc (flag: m)
--with-wide-unicode (flag: u)
via PEP 3149.
Regarding the m flag specifically, this is what Pymalloc is:
Pymalloc, a specialized object allocator written by Vladimir
Marangozov, was a feature added to Python...
When should I use mmap for file access?
...programs; program A which reads in a 1MB file into a buffer creating with malloc, and program B which mmaps the 1MB file into memory. If the operating system has to swap part of A's memory out, it must write the contents of the buffer to swap before it can reuse the memory. In B's case any unmodif...
How does one write code that best utilizes the CPU cache to improve performance?
...mbers by decreasing size is one way)
Beware of the standard dynamic memory allocator, which may introduce holes and spread your data around in memory as it warms up.
Make sure all adjacent data is actually used in the hot loops. Otherwise, consider breaking up data structures into hot and cold compo...
Constructors in Go
... makeThing(name string) Thing {
return Thing{name, 33}
}
Reference : Allocation with new in Effective Go.
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Multiple Inheritance in PHP
I'm looking for a good, clean way to go around the fact that PHP5 still doesn't support multiple inheritance. Here's the class hierarchy:
...