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,
++d_; return *this;
return time_point(d_++)
d_; return *this;
return time_point(d_);
(none).
time_point
after modificationtime_point
made before modification increments or decrements the tick count (public member function of std::chrono::duration<Rep,Period> ) 

modifies the time point by the given duration (public member function) 

(C++11)  performs add and subtract operations involving a time point (function template) 
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