【原子操作】顺序操作

#include <atomic>
#include <iostream>
#include <thread>
std::atomic<int> count = {0};
// g++ atomic.cpp -lpthread -std=c++14 -latomic
struct A {
    float x;
    int y;
    long long z;
};
int main()
{
#if 0    
    std::thread t1([]{
        while(1){
            if(count == 0){
                std::cout<< "t1:1"<<'\n';
                count.fetch_add(1);
            }
        }
    });
    std::thread t2([]{
        while(1){
            if(count == 1){
                std::cout<< "t2:2"<<'\n';
                count.fetch_sub(1);
            }
        }
    });
    t1.join();
    t2.join();
 #endif   
    std::atomic<A> a;
    std::cout << std::boolalpha << ":" << a.is_lock_free() << std::endl;
    return 0;
}