std::future<int> fu = std::async(std::launch::deferred,factorial, 4); // 会创建另一个线程.并立即执行 std::future<int> fu = std::async(std::launch::async,factorial, 4); // 和std::launch::async一样 std::future<int> fu = std::async(std::launch::async | std::launch::deferre...
int main() { std::vector<int> input_data = {1, 2, 3, 4, 5}; std::vector<std::future<int>> futures; for (int data : input_data) { auto preprocess_future = std::async(std::launch::async, preprocess, data); auto process_future = std::async(std::launch::async, process, pre...
std::string msg){std::string metaMsg=msg+" has been modified";proms.set_value(metaMsg);}intmain(){std::string msg_str="My Message";//创建promise对象std::promise<std::string>proms;//创建一个关联的future对象std::future<std::string>future_obj=proms.get_future();//给线程...
void f2(int& n) { std::cout << "thread-id:" << std::this_thread::get_id() << "\n"; for (int i = 0; i < 5; ++i) { std::cout << "Thread 2 executing:" << n << "\n"; ++n; std::this_thread::sleep_for(std::chrono::milliseconds(1000)); } } int main() { ...
在C++中,std::thread的使用通常涉及到将一个函数或可调用对象传递给其构造函数,随后该线程会立即启动执行这个函数。例如: #include <iostream>#include <thread>void task() {std::cout << "Task is running..." << std::endl;}int main() {std::thread t(task);t.join();return 0;} ...
若要修复此错误,请改用 std::move: C++ 复制 S(moveable && m) : m_m(std::move(m)) 局部类无法引用之后在同一函数中定义的其他局部类 下面的代码现在生成错误 C2079:"s" 使用未定义的结构 "main::S2" C++ 复制 int main() { struct S2; struct S1 { void f() { S2 s; } }; struct...
int main() { std::vector<std::future<int>> v; }" HAVE_STD_FUTURE) # Check that std::map::emplace is available for g++-4.7. check_cxx_source_compiles(" #include int main() { std::map<int, int>().emplace(1, 2); }" HAVE_STD_MAP_EMPLACE) cmake_pop_check_state()...
std::cout<<"*\n"; mtx.unlock(); }intmain () { std::thread threads[10];//spawn 10 threads:for(inti=0; i<10; ++i) threads[i]=std::thread(fireworks);for(auto&th : threads) th.join();return0; } std::recursive_timed_mutex 介绍 ...
std::atomic<int> refcount; }; const std::string unknown_filename = "filename not specified"; constexpr const char* unknown_filename = "filename not specified"; #ifdef _WIN32 const std::string unknown_eventname = "eventname not specified"; constexpr const char* unknown_eventname = "eve...
例如我们可以用future read来表示读取磁盘文件的结果,这个结果是一个int值,这个read函数没有任何等待,立马返回给我们一个future. 调用者调用future.available()检查值是否可用,一旦可用,就用future.get获取相应的值。 Promise Promise顾名思义承诺,代表一个异步函数,这个异步函数返回future,并承诺在将来的某个时间点给...