Why Use a Pointer for WaitGroup.Done but Not for WaitGroup.Add and WaitGroup.Wait?

Pointers and Variables in WaitGroups Reference

In the sync package, the functions Add, Done, and Wait are all called by a pointer to a WaitGroup:

• Add increments the wait count by the given delta.
• Done decrements the wait count.
• Wait blocks until the wait count is zero.

In the provided code snippet, the Done function is called using a pointer variable, while the Add and Wait functions are called using a variable (not a pointer).

However, all three functions are called on the same WaitGroup value.

• The wg variable is declared as a value of sync.WaitGroup, but the Add, Done, and Wait methods are called on the address of wg (wg) using the dereference operator ().
• This means that all three functions are operating on the same underlying WaitGroup value.
• The only difference is that Done is called on the address of wg to ensure that the correct WaitGroup value is being modified.

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