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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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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354// PROSE‑ONLY GAP EXAMPLE – hazard_pointer preview// The <hazard_pointer> header is not present in the current libc++.// This stub demonstrates typical usage when the library is available.
/*#include <hazard_pointer>#include <atomic>#include <thread>#include <vector>#include <iostream>
struct node { int value; std::atomic<node*> next{nullptr};};
using hp = hazard_pointer;
std::atomic<node*> head{nullptr};
void push(int v) { node* n = new node{v}; do { n->next.store(head.load(std::memory_order_relaxed), std::memory_order_relaxed); } while (!head.compare_exchange_weak(n->next, n, std::memory_order_release, std::memory_order_relaxed));}
int pop() { hp guard; node* p = nullptr; do { p = head.load(std::memory_order_acquire); if (!p) return -1; // empty guard.protect(p); } while (!head.compare_exchange_weak(p, p->next, std::memory_order_acquire, std::memory_order_relaxed)); int v = p->value; delete p; // safe after no other thread holds a hazard pointer to it return v;}
int main() { std::vector<std::thread> threads; for (int i = 0; i < 4; ++i) { threads.emplace_back([](){ for (int j = 0; j < 1000; ++j) push(j); for (int j = 0; j < 1000; ++j) pop(); }); } for (auto& t : threads) t.join(); std::cout << "finished\n"; return 0;}*/