Introduction to std::packaged_task
This lesson gives an introduction to std::packaged_task which is used in C++ for multithreading.
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std::packaged_task pack is a wrapper for a callable in order for it to be invoked asynchronously. By calling pack.get_future() you get the associated future. Invoking the call operator on pack (pack()) executes the std::packaged_task and, therefore, executes the callable.
Dealing with std::packaged_task usually consists of four steps:
I. Wrap your work:
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std::packaged_task<int(int, int)> sumTask([](int a, int b){ return a + b; });
II. Create a future:
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std::future<int> sumResult= sumTask.get_future();
III. Perform the calculation:
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sumTask(2000, 11);
IV. Query the result:
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sumResult.get();
Here is an example showing the four ...
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