coding judge system
https://github.com/DMOJ/online-judge https://github.com/DOMjudge/domjudge https://github.com/zhblue/hustoj https://blog.huli.tw/2020/03/23/en/build-your-own-online-judge-system/
what is std::forward and universal reference
std::forward, could you explain what does it mean, why it is needed there? Certainly! std::forward is a utility function in C++ that is used to implement perfect forwarding. Perfect forwarding…
iouring vs traditional read/write on files
what is difference between iouring vs normal hard driver driver software io_uring is a relatively new I/O interface introduced in the Linux kernel (starting from version 5.1) to provide a…
how condition variable wait_for with timeout implemented
essentially it is: os scheduler constant run + queue + timer how to let queue notify client that new element available instead of client poll/loop to check? ChatGPT To notify…
C++ const in return value, return reference and at end of function signature
In C++, const can be used in several contexts to indicate that a value, reference, or member function is immutable (cannot be changed). Understanding the use of const is crucial…
strong consistency in inventory management for a shopping site
Ensuring strong consistency in inventory management for a shopping site is crucial to prevent issues like overselling, maintaining accurate stock levels, and providing a reliable user experience. Here are several…
kafka consumer uses poll instead of notification
How kafka client get notification? Kafka clients (both producers and consumers) interact with the Kafka server (brokers) primarily through polling mechanisms. Here’s how it works for both producers and consumers:…
video streaming HLS, DASH
What is DASH and HLS? DASH (Dynamic Adaptive Streaming over HTTP) and HLS (HTTP Live Streaming) are both popular streaming protocols used to deliver multimedia content over the internet, but…
c++ share_ptr pass by value or reference
In controlled circumstances you can pass the shared pointer by constant reference. Be sure that nobody is concurrently deleting the object, though this shouldn’t be too hard if you’re careful about…
python calling c++, c++ calling python
The pybind11 make python calling any c++ function easier https://pybind11.readthedocs.io/en/stable/basics.html Also we can invoke python script from c++ as well: https://pybind11.readthedocs.io/en/stable/advanced/smart_ptrs.html Other alternatives: boost python https://www.boost.org/doc/libs/1_84_0/libs/python/doc/html/index.html
