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operator+, operator-(std::time_point)

(1) 
template< class C, class D1, class R2, class P2 >
time_point<C, typename std::common_type<D1, duration<R2,P2>>::type>
    operator+( const time_point<C,D1>& pt, 
               const duration<R2,P2>& d );
 (since C++11)
(until C++14) 
template< class C, class D1, class R2, class P2 >
constexpr time_point<C, typename std::common_type<D1, duration<R2,P2>>::type>
    operator+( const time_point<C,D1>& pt, 
               const duration<R2,P2>& d );
 (since C++14)
(2) 
template< class R1, class P1, class C, class D2 >
time_point<C, typename std::common_type<duration<R1,P1>,D2>::type>
    operator+( const duration<R1,P1>& d, 
               const time_point<C,D2>& pt );
 (since C++11)
(until C++14) 
template< class R1, class P1, class C, class D2 >
constexpr time_point<C, typename std::common_type<duration<R1,P1>,D2>::type>
    operator+( const duration<R1,P1>& d, 
               const time_point<C,D2>& pt );
 (since C++14)
(3) 
template< class C, class D1, class R2, class P2 >
time_point<C, typename std::common_type<D1, duration<R2,P2>>::type>
    operator-( const time_point<C,D1>& d, 
               const duration<R2,P2>& pt );
 (since C++11)
(until C++14) 
template< class C, class D1, class R2, class P2 >
constexpr time_point<C, typename std::common_type<D1, duration<R2,P2>>::type>
    operator-( const time_point<C,D1>& d, 
               const duration<R2,P2>& pt );
 (since C++14)
(4) 
template< class C, class D1, class D2 >
typename std::common_type<D1,D2>::type
    operator-( const time_point<C,D1>& pt_lhs, 
               const time_point<C,D2>& pt_rhs );
 (since C++11)
(until C++14) 
template< class C, class D1, class D2 >
constexpr typename std::common_type<D1,D2>::type
    operator-( const time_point<C,D1>& pt_lhs, 
               const time_point<C,D2>& pt_rhs );
 (since C++14)

Performs add and subtract operations involving a time_point.

1-2) Applies the offset d to pt. Effectively returns CT(pt.time_since_epoch() + d), where CT is the return type.
3) Applies the offset d to pt in negative direction. Effectively returns CT(ot.time_since_epoch() - d), where CT is the return type.
4) Computes the difference between pt_lhs and pt_rhs.

Parameters

pt - a time point to apply the offset to
d - a time offset
pt_lhs, pt_rhs - time points to extract difference from

Return value

1-3) The time point that resulted from applying the offset d.
4) The duration between the time points.

Exceptions

(none).

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2739 C++11 pt - d behaved erratically for unsigned durations behavior corrected

See also

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

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