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

Since C++20

Header: <chrono>

1,2) Adds ds.count() days to d.

# Declarations

constexpr std::chrono::day operator+( const std::chrono::day& d,
const std::chrono::days& ds ) noexcept;

(since C++20)

constexpr std::chrono::day operator+( const std::chrono::days& ds,
const std::chrono::day& d ) noexcept;

(since C++20)

constexpr std::chrono::day operator-( const std::chrono::day& d,
const std::chrono::days& ds ) noexcept;

(since C++20)

constexpr std::chrono::days operator-( const std::chrono::day& x,
const std::chrono::day& y ) noexcept;

(since C++20)

# Notes

1-3) If the result would be outside the range [0, 255], the actual stored value is unspecified.

# Example

#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));
}

# See also