02b_thread_func_arg_move.cpp

// Example of passing arguments to a thread function by move
#include <iostream>
#include <thread>
#include <string>

// Thread entry point function
// Requires an rvalue argument
void func(std::string&& str){
    std::cout<<"Ownership of \"" <<str<<"\" transferred to thread"<<std::endl;
}

int main(){
    std::string str = "moveable";
    std::cout << "Starting thread" << std::endl;

    // Wrap str in a call to std::move()
    std::thread thr(func, std::move(str));
    thr.join();

    // Verify that str has been modified
    std::cout <<"Do I still have any data?"<<std::endl;
    std::cout << (str.empty()?"No":"Yes") << std::endl;
}