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並前往https://stackoverflow.com/questions/31107614/what-does-an-empty-set-of-parentheses-mean-when-used-in-a-generic-type-declarati

What does an empty set of parentheses ... - Stack Overflow

() is an empty tuple, a simple zero-sized type (it uses no memory) with only one value possible, () . It's also known as the unit type.

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