std::future - cppreference.com std::promise - cppreference.com https://en.cppreference.com/w/cpp/thread/packaged_task
#include <algorithm>#include <future>#include <iostream>#include <mutex>#include <numeric>#include <string>#include <vector>std::mutexm;structX{voidfoo(inti,conststd::string&str){std::lock_guard<std::mutex>lk(m);std::cout<<str<<' '<<i<<'\n';}voidbar(conststd::string&str){std:...
std::future<int> future = promise_.get_future();// 创建通道 std::threadt1(task, std::ref(promise_),12);// 将promise作为参数传入到线程函数中 线程函数 std::threadt2(get_task_value, std::ref(future));// 获取线程函数值的线程 t1.join(); t2.join(); return0; } 运行结果: 关于share...
std::ref(x),std::ref(y));std::cout << fu.get() << std::endl;//获取当前计算机线程数量std::cout << std::thread::hardware_concurrency() << std::endl;//获取当前线程IDstd::cout << std::hex <<std::this_thread::get_id() << std::endl;system("pause");return0;...
近期发现项目组使用新版本的opentelemetry-cpp的时候偶现崩溃。崩溃的位置在STL的std::future析构的地方,而这个std::future由std::async创建。 比较违反直觉,这里记录分享一下分析和解决过程方面其他碰到的小伙伴们。 问题分析 相关代码和规范 首先我们来看下相关代码: ...
则还需要将类对象指针传入（直接传入，传入指针，或者是std::ref封装）。
Exception thrown at 0x00007FFC0323A799 in cpptests.exe: Microsoft C++ exception: std::bad_alloc at memory location 0x000000F77DEFEF20. This is because in nameCallback we try to access a member of the User structure. However, since the object of this type was deleted (via pJohn.reset...
void test() { //封装一个异步操作 std::packaged_task<int()> task([]() { std::this_thread::sleep_for(std::chrono::seconds(5)); return 7; }); std::thread t1(std::ref(task)); std::future<int> f1 = task.get_future(); std::cout << "Waiting..." << std::endl; std::fu...