Memory usage? about thread-pool HOT 2 CLOSED

Thanks for the comment. In the initial version I used std::packaged_task, but I found that std::shared_ptr actually provides better performance. However, I'm currently working on a new version (v3.0.0) that is essentially going to be rewritten from scratch, and in that version I am going to try std::packaged_task again and see if it works better.

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Update: After reviewing past issues I realized that in #26 it was mentioned that using std::packaged_task makes the library incompatible with MSVC. Therefore, I have decided to keep using std::shared_ptr in submit() for the time being. However, I did slightly modify the code to use std::make_shared for creating the shared pointer, which only performs one allocation instead of two, and therefore should increase performance. This will be implemented in v3.0.0, which will be released in the next few days.

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