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

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time_point & operator + = ( const duration & d ) ;	(1)	(C++11 起) (C++17 起为 constexpr)
time_point & operator - = ( const duration & d ) ;	(2)	(C++11 起) (C++17 起为 constexpr)

按照给定时长修改时间点。

1) 将偏移量 d 应用于

pt

。实际上， d 会被添加到内部存储的持续时间

d_

中，即 d_ + = d 。

2) 将偏移量 d 以负方向应用于

pt

。实际上， d 会从内部存储的持续时间

d_

中减去，即 d_ - = d 。

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Member functions
time_point::time_point
time_point::time_since_epoch
time_point::operator+= time_point::operator-=
time_point::operator++ time_point::operator-- (C++20) (C++20)
time_point::min
time_point::max
Non-member functions
operator+ operator-
operator== operator!= operator< operator<= operator> operator>= operator<=> (until C++20) (C++20)
time_point_cast
floor (C++17)
ceil (C++17)
round (C++17)
Helper classes
common_type
hash <std::chrono::time_point> (C++26)

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