char*argv[]){auto test=std::make_shared<SomeType>();std::vector<std::thread>operations;for(int i=0;i<10000;i++){std::thread([=]()mutable{//<<--auto n=std::make_shared<SomeType>
线程执行完毕后,main()函数将打印global_instance(std::shared_ptr对象)的值。 #include<iostream>#include<memory>#include<thread>#include<chrono>#include<mutex>#include<vector>std::shared_ptr<int>global_instance=std::make_shared<int>(0);std::mutexm;constexprintmax_loop=10000;voidthread_fcn(){/...
1include <iostream>2#include <memory>3#include <thread>4#include <chrono>5#include <mutex>67structTest8{9Test() { std::cout <<"Test::Test()\n"; }10~Test() { std::cout <<"Test::~Test()\n"; }11};1213//线程函数14voidthr(std::shared_ptr<Test>p)15{16//线程暂停1s17std::...
};//线程函数voidthr(std::shared_ptr<Test> p){//线程暂停1sstd::this_thread::sleep_for(std::chrono::seconds(1));//赋值操作, shared_ptr引用计数use_cont加1(c++11中是原子操作)std::shared_ptr<Test> lp = p; {//static变量(单例模式),多线程同步用staticstd::mutex io_mutex;//std::lock...
#include <thread> #include <memory> #include <Windows.h> int main() { std::thread t; { std::shared_ptr<int> p(new int(1), [](i
std::shared_ptr<Base> lp = p; // thread-safe, even though the // shared use_count is incremented { static std::mutex io_mutex; std::lock_guard<std::mutex> lk(io_mutex); std::cout << "local pointer in a thread:\n" << " lp.get() = " << lp.get() ...
是指在C++编程中,当使用std::shared_ptr来管理动态分配的内存时,如果将两个指向同一内存块的shared_ptr相加,可能会导致内存的重复释放,从而引发分段故障(segmentation fault)。 std::shared_ptr是C++11引入的智能指针,用于自动管理动态分配的内存。它使用引用计数的方式来跟踪内存的所有者,并在没有所有者时自动...
std::shared_ptr<int> ptr = std::make_shared<int>(100); std::mutex mt; for (auto i= 0; i<10; i++){ std::thread([&ptr, &mt]{ std::scoped_lock lock(mt); ptr = std::make_shared<int>(200); //... }).detach(); } 原子函数: std::shared_ptr<int> ptr = std::make...
std::shared_ptr<Dog> pd; void F() { pd = std::make_shared<Dog>("Smokey"); } int main() { std::thread t1(F); std::thread t2(F); t1.join(); t2.join(); return 0; } Run Code Online (Sandbox Code Playgroud) std::shared_ptr<Dog> pd(new Dog("Gunner")); void F()...
{std::this_thread::sleep_for(std::chrono::seconds(1));std::shared_ptr<Base>lp=p;// 线程安全,虽然自增共享的 use_count{staticstd::mutexio_mutex;std::lock_guard<std::mutex>lk(io_mutex);std::cout<<"local pointer in a thread:\n"<<" lp.get() = "<<lp.get()<<", lp.use_...