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A Tour of C++ for experienced programmers, as if C++26 is the only version that ever existed.
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123456789101112131415161718192021222324252627282930#include <atomic>#include <thread>#include <iostream>
// Two threads hand off a token using acquire/release ordering.// Thread A stores 1 with release, Thread B loads with acquire.
std::atomic<int> flag{0};
void producer() { // Do some work before releasing std::cout << "producer ready\n"; flag.store(1, std::memory_order_release);}
void consumer() { while (flag.load(std::memory_order_acquire) == 0) { // spin‑wait } std::cout << "consumer observed release\n"; // EXPECT: consumer observed release}
int main() { std::thread t1(producer); std::thread t2(consumer); t1.join(); t2.join(); return 0;}