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What is move semantics?
...ng class which only holds a pointer to a heap-allocated block of memory:
#include <cstring>
#include <algorithm>
class string
{
char* data;
public:
string(const char* p)
{
size_t size = std::strlen(p) + 1;
data = new char[size];
std::memcpy(data, p...
Generating random whole numbers in JavaScript in a specific range?
...
Math.random()
Returns an integer random number between min (included) and max (included):
function randomInteger(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
Or any random number between min (included) and max (not included):
function randomNumber(min, ma...
Effects of changing Django's SECRET_KEY
...
Since this question was asked, the Django documentation has changed to include an answer.
The secret key is used for:
All sessions if you are using any other session backend than django.contrib.sessions.backends.cache, or are using the default get_session_auth_hash().
All messages if you are u...
HTML5 Audio stop function
... works, thanks. On a side note i'd love to know why the w3c decided to not include a stop method in the spec.
– Reahreic
Feb 17 '17 at 15:38
add a comment
|...
Upgrading PHP in XAMPP for Windows?
...that this answer only describes saving the web and MySQL data. It does not include configuration changes to PHP (php.ini) Apache (httpd.conf and others) etc.
– Kwebble
Jul 31 '15 at 13:03
...
Big-O for Eight Year Olds? [duplicate]
...ired is independent of the size of the input. 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 c...
Batch file to delete files older than N days
...d Windows Server have it installed by default.
For Windows 7 and newer (including Windows 10):
The syntax has changed a little. Therefore the updated command is:
forfiles /p "C:\what\ever" /s /m *.* /D -<number of days> /C "cmd /c del @path"
...
Android Studio with Google Play Services
... (the button to the left of the AVD manager).
Since version 6.5 you can include the complete library (very large) or just the modules that you need (Best Option). I.e if you only need Google Maps and Analytics you can replace the previous example with the following one:
dependencies {
co...
C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
... HazPtr。
2. Hazard Pointer
首先回忆下引用计数的做法：
#include <atomic>
#include <memory>
template <class T>
class ReferenceCount {
public:
ReferenceCount(std::unique_ptr<T> ptr) : ptr_(std::move(ptr)), cnt_(1) {}
T *Ptr() const { return ptr_.get(); }
Referenc...
PHP global in functions
...ng to keep track of your variable names.
global is a bad pattern even for including global things such as $db resources. There will come the day when you want to rename $db but can't, because your whole application depends on the name.
Limiting and separating the scope of variables is essential fo...