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std::chrono::time_point<Clock,Duration>::operator++, std::chrono::time_point<Clock,Duration>::operator--

constexpr time_point& operator++();	(1)	(since C++20)
constexpr time_point operator++(int);	(2)	(since C++20)
constexpr time_point& operator--();	(3)	(since C++20)
constexpr time_point operator--(int);	(4)	(since C++20)

Modifies the point in time *this represents by one tick of the duration.

If d_ is a member variable holding the duration (i.e., time since epoch) of this time_point object,

1) Equivalent to ++d_; return *this;

2) Equivalent to return time_point(d_++)

3) Equivalent to --d_; return *this;

4) Equivalent to return time_point(d_--);

(none).

1,3) a reference to this time_point after modification

2,4) a copy of the time_point made before modification

operator++operator++(int)operator--operator--(int)	increments or decrements the tick count (public member function of `std::chrono::duration<Rep,Period>`)
operator+=operator-=	modifies the time point by the given duration (public member function)
operator+operator- (C++11)	performs add and subtract operations involving a time point (function template)

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