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Type erasure techniques
...
That said, there's one technique I particularly like, though: It's shared_ptr<void>, simply because it blows the minds off of people who don't know you can do this: You can store any data in a shared_ptr<void>, and still have the correct destructor called at the end, because the shared_...
How do I call ::std::make_shared on a class with only protected or private constructors?
...string, int) {}
template <typename... T>
static ::std::shared_ptr<A> create(T &&...args) {
return ::std::make_shared<A>(this_is_private{0},
::std::forward<T>(args)...);
}
protected:
struct this_is_private {
...
9个常用iptables配置实例 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...p --sport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
类似的，对于HTTP/HTTPS(80/443)、pop3(110)、rsync(873)、MySQL(3306)等基于tcp连接的服务，也可以参照上述命令配置。
对于基于udp的dns服务，使用以下命令开启端口服务：
iptables -A OUTPUT -p ud...
ESP8285接入App Inventor 2深度调研：4种连接方案+是否需要开发拓展 - 创客...
...下可用的连接组件：
1. 内置组件(MIT官方)
- Web组件 - HTTP GET/POST请求，支持JSON解析
- BluetoothClient - 蓝牙SPP串口通信
- Serial - USB串口(基于Physicaloid库，支持Arduino)
2. fun123自研拓展
- ClientSocketAI2Ext - TCP Socket客户端，支持异...
What are the advantages of using nullptr?
...tage. But consider the following overloaded functions:
void f(char const *ptr);
void f(int v);
f(NULL); //which function will be called?
Which function will be called? Of course, the intention here is to call f(char const *), but in reality f(int) will be called! That is a big problem1, isn't i...
Rule-of-Three becomes Rule-of-Five with C++11?
...-in-a-package" classes are included in the standard
library: std::unique_ptr and std::shared_ptr. Through the use of
custom deleter objects, both have been made flexible enough to manage
virtually any kind of resource.
...
c/c++ volatile和mutable关键字 - C/C++ - 清泛网 - 专注C/C++及内核技术
...么。
3); 下面的函数有什么错误：
int square(volatile int *ptr)
{
return *ptr * *ptr;
}
下面是答案：
1)是的。一个例子是只读的状态寄存器。它是volatile因为它可能被意想不到地改变。它是const因为程序不应该试图去修改它。
2)是...
Checking network connection
...his:
import urllib2
def internet_on():
try:
urllib2.urlopen('http://216.58.192.142', timeout=1)
return True
except urllib2.URLError as err:
return False
Currently, 216.58.192.142 is one of the IP addresses for google.com. Change http://216.58.192.142 to whatever ...
For i = 0, why is (i += i++) equal to 0?
...f the running code:
int i = 0;
xor edx, edx
mov dword ptr i, edx // set i = 0
i += i++;
mov eax, dword ptr i // set eax = i (=0)
mov dword ptr tempVar1, eax // set tempVar1 = eax (=0)
mov eax, dword ptr i // set eax = 0 ( ag...
How do I sort an observable collection?
...d a relevant blog entry that provides a better answer than the ones here:
http://kiwigis.blogspot.com/2010/03/how-to-sort-obversablecollection.html
UPDATE
The ObservableSortedList that @romkyns points out in the comments automatically maintains sort order.
Implements an observable collection ...