C++ Reassigning thread objects


Example

We can create empty thread objects and assign work to them later.

If we assign a thread object to another active, joinable thread, std::terminate will automatically be called before the thread is replaced.

#include <thread>

void foo()
{
    std::this_thread::sleep_for(std::chrono::seconds(3));
}
//create 100 thread objects that do nothing
std::thread executors[100];

// Some code

// I want to create some threads now

for (int i = 0;i < 100;i++)
{
    // If this object doesn't have a thread assigned
    if (!executors[i].joinable())
         executors[i] = std::thread(foo);
}