Class worker

external/cpp-httplib/httplib.h:572–596

    private:
        struct worker {
            explicit worker(ThreadPool& pool) : pool_(pool) {}

            void operator()() {
                for (;;) {
                    std::function<void()> fn;
                    {
                        std::unique_lock<std::mutex> lock(pool_.mutex_);

                        pool_.cond_.wait(
                            lock, [&] { return !pool_.jobs_.empty() || pool_.shutdown_; });

                        if (pool_.shutdown_ && pool_.jobs_.empty()) { break; }

                        fn = pool_.jobs_.front();
                        pool_.jobs_.pop_front();
                    }

                    assert(true == static_cast<bool>(fn));
                    fn();
                }
            }

            ThreadPool& pool_;
        };
        friend struct worker;

        std::vector<std::thread> threads_;