lang/lambdathis.cpp

The following code example is taken from the book
C++17 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2017
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code
#include <iostream>
#include <string>
#include <thread>

class Data {
  private:
    std::string name;
  public:
    Data(const std::string& s) : name(s) {
    }
    auto startThreadWithCopyOfThis() const {
        // start and return new thread using this after 3 seconds:
        using namespace std::literals;
        std::thread t([*this] {
                               std::this_thread::sleep_for(3s);
                               std::cout << name << '\n';
                           });
        return t;
    }
};

int main()
{
    std::thread t;
    {
      Data d{"c1"};
      t = d.startThreadWithCopyOfThis();
    } // d is no longer valid
    t.join();
}