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std::chrono::operator+, std::chrono::operator- (std::chrono::day)

From cppreference.com
< cpp‎ | chrono‎ | day
 
 
Date and time library
(C++11)
(C++20)
(C++11)
(C++11)
(C++11)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
(C++20)

 
 
Defined in header <chrono>
constexpr std::chrono::day operator+( const std::chrono::day &  d,
                                      const std::chrono::days & ds ) noexcept;
(1) (since C++20)
constexpr std::chrono::day operator+( const std::chrono::days & ds,
                                      const std::chrono::day &  d ) noexcept;
(2) (since C++20)
constexpr std::chrono::day operator-( const std::chrono::day &  d,
                                      const std::chrono::days & ds ) noexcept;
(3) (since C++20)
constexpr std::chrono::days operator-( const std::chrono::day & x,
                                       const std::chrono::day & y ) noexcept;
(4) (since C++20)
1,2) Adds ds.count() days to d.
3) Subtracts ds.count() days from d.
4) Calculate the difference, in days, between two day x and y.

[edit] Return value

1,2) std::chrono::day (unsigned(d) + ds.count())
3) std::chrono::day (unsigned(d) - ds.count())
4) std::chrono::days (int(unsigned(x)) - int(unsigned(y)))

[edit] Notes

1-3) If the result would be outside the range [0255], the actual stored value is unspecified.

[edit] Example

Run this code
#include <cassert>
#include <chrono>
 
int main()
{
 std::chrono::day d{15};
 
 d = d + std::chrono::days (2);
 assert (d == std::chrono::day (17));
 
 d = d - std::chrono::days (3);
 assert (d == std::chrono::day (14));
 
 constexpr std::chrono::days ds = std::chrono::day (16) - std::chrono::day (14);
 static_assert(ds == std::chrono::days (2));
}

[edit] See also

increments or decrements the day
(public member function) [edit]
adds or subtracts a number of days
(public member function) [edit]
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