Python os.cpu_count() 的现代 C++ 等价物
Python 的 C++ 等价物（自 2011 年的 C++11 起）
example.py
os.cpu_count()是
hardware_concurrency.cpp
#include <thread>
std::thread::hardware_concurrency()另见 cppreference.com 上 std::thread::hardware_concurrency() 的文档。
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