Reassigning thread objects

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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()
//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);

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