情况一：多线程代码操作的是同一个shared_ptr的对象 比如std::thread的回调函数，是一个lambda表达式，...
即不包含weak_ptr只计数shared_ptr的引用计数，故而析构函数对这个引用计数的修改必须是线程安全的，否则...
juju::shared_ptr<int> ap(new int); std::thread t1(test_multi_thread_copy, ap, 10);//成功与否取决于n的大小 std::thread t2(test_multi_thread_copy, ap, 10); t1.join(); t2.join(); std::cout << ap.use_count() << std::endl; struct ListNode { /*std::shared_ptr<ListNode> ...
Thread safetyis a computer programming concept applicable to multi-threaded code. Thread-safe code only manipulates shared data structures in a manner that ensures that all threads behave properly and fulfill their design specifications without unintended interaction. There are various strategies for making...
{return__shared_ptr<element_type, _Lp>(*this); } __catch(constbad_weak_ptr&) {//Q: How can we get here?//A: Another thread may have invalidated r after the//use_count test above.return__shared_ptr<element_type, _Lp>(); }#else//Optimization: avoid try/catch overhead when ...
shared_ptr is designed to cope with multi-threaded use, but it doesn't in any way mandate it. I haven't dug deep into the standard to confirm that, but every implementation I'm aware of behaves in the expected way and adds no thread safety requirements where there would have been none...
shared_ptrcopy in every call. Notice that this doesn't copy theRuleMessageinstance, which could be costly, but copying astd::shared_ptris not cheaper than a reference because its control block is guaranteed to be thread-safe, and thus these copies use synchronization primitives (such as ...
Multi-threading: C++11 <atomic> C++11 <condition_variable> C++11 <future> C++11 <mutex> C++11 <thread> Other: <algorithm> <bitset> C++11 <chrono> C++11 <codecvt> <complex> <exception> <functional> C++11 <initializer_list> <iterator> <limits> <locale> <memory> <new...
Parameters x Anothershared_ptrobject of the same type (i.e., with the same class template parameterT). Return value none Example 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 // shared_ptr::swap example#include <iostream>#include <memory>intmain () { std::shared_ptr<int> foo (newin...
*/#ifndef_TR1_SHARED_PTR_H#define_TR1_SHARED_PTR_H 1namespacestd_GLIBCXX_VISIBILITY(default){_GLIBCXX_BEGIN_NAMESPACE_VERSIONnamespacetr1{/** * @brief Exception possibly thrown by @c shared_ptr. * @ingroup exceptions */classbad_weak_ptr:publicstd::exception{public:virtualcharconst*what()co...