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How to implement an STL-style iterator and avoid common pitfalls?
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http://www.cplusplus.com/reference/std/iterator/ has a handy chart that details the specs of § 24.2.2 of the C++11 standard. Basically, the iterators have tags that describe the valid operations, and the tags have a hierarc...
Differences between unique_ptr and shared_ptr [duplicate]
Could someone explain differences between shared_ptr and unique_ptr?
4 Answers
4
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Why do std::shared_ptr work
I found some code using std::shared_ptr to perform arbitrary cleanup at shutdown. At first I thought this code could not possibly work, but then I tried the following:
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Pointer expressions: *ptr++, *++ptr and ++*ptr
...much for that. What about the rest? You ask about the meanings of these:
*ptr++
*++ptr
++*ptr
We just talked about the first, so let's look at the second: *++ptr.
We saw in our earlier explanation that postfix increment p++ has a certain precedence, a value, and a side effect. The prefix increm...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...现远程控制、远程下发、远程升级等功能。当然，tcp或者http也可以，只不过没这么直观方便。4. mqtt与自定义的tcp的物联网协议相比，更为标准化，降低与第三方物联网服务集成的工作量。5. mqtt针对物联网传输的2G/4G/5G流量费用...
Test if remote TCP port is open from a shell script
...e.org 80 </dev/null; echo $?
Connection to canyouseeme.org 80 port [tcp/http] succeeded!
0
Failure:
$ nc -w 2 -v canyouseeme.org 81 </dev/null; echo $?
nc: connect to canyouseeme.org port 81 (tcp) timed out: Operation now in progress
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If the hostname maps to multiple IPs, the above failing ...
Differences between TCP sockets and web sockets, one more time [duplicate]
...sing the established TCP connection between a Client and Server. After the HTTP handshake the Client and Server start speaking WebSocket protocol by exchanging WebSocket envelopes. HTTP handshaking is used to overcome any barrier (e.g. firewalls) between a Client and a Server offering some services ...
scoped_ptr 与 auto_ptr 与 shared_ptr 区别总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
scoped_ptr 与 auto_ptr 与 shared_ptr 区别总结1.auto_ptr 被复制后，将失去原来所致资源的所有权；2.scoped_ptr永远不能被复制或被赋值！scoped_ptr拥有它所指向的资源的所有权，并永远不会放弃这个所有权；3.shared_ptr 是可以共享所有权的...
Why would finding a type's initializer throw a NullReferenceException?
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What is the fundamental difference between WebSockets and pure TCP?
...tions. Usually they will have only a few standard ones such as port 80 for HTTP or 443 for HTTPS. So, to communicate with the server you are obliged to connect using one of those ports.
Given that these are standard ports for web servers that generally speak HTTP, you're therefore obliged to confor...