BB4.7 shared_ptr и многопоточность

RobertDeMilo

Jun 21st, 2024

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#include <memory>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
class Data
{
public:
Data(string data): data_(data)
{
cout << "Data constructed\n";
}
~Data()
{
cout << "Data destructed\n";
}
const string& Get() const
{
return data_;
}
string& Get()
{
return data_;
}
private:
string data_;
};
void ShareResource(shared_ptr<const Data> ptr)
{
stringstream ss;
ss << "Shared resource " << ptr->Get() << " in " << this_thread::get_id() << ", counter = " << ptr.use_count() << endl;
cout << ss.str();
//ptr->Get().push_back('x');
}
vector<future<void>> spawn() {
vector<future<void>> tasks;
auto data = make_shared<const Data>("meow"); // Create shared_ptr
for (int i = 0; i < 10; ++i) {
tasks.push_back(async([data]() { // Capture shared_ptr by copy
ShareResource(data);
}));
}
return tasks;
}
int main()
{
cout << "Spawning tasks...\n";
auto tasks = spawn();
cout << "Done spawning.\n";
return 0;
}

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