std::chrono::duration<Rep,Period>::operator+(unary), std::chrono::duration<Rep,Period>::operator-(unary)

From cppreference.com
< cpp‎ | chrono‎ | duration
C++
Date and time library
Time point
(C++11)
(C++20)
Duration
(C++11)
Clocks
(C++11)
(C++11)
(C++20)
(C++20)
(C++20)
(C++11)
(C++20)
(C++20)
(C++20)
Time of day
(C++20)(C++20)
(C++20)(C++20)
(C++20)

Calendar
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
Time zone
(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)
chrono I/O
(C++20)
C-style date and time
std::chrono::duration
Member functions
Non-member functions
(C++17)
(C++17)
(C++17)
(C++17)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++20)

Helper classes
(1)
constexpr duration operator+() const;
 (until C++17)
constexpr std::common_type_t <duration> operator+ ( ) const ;
(since C++17)
(2)
constexpr duration operator-() const;
 (until C++17)
constexpr std::common_type_t <duration> operator- ( ) const ;
(since C++17)

Implements unary plus and unary minus for the durations.

If rep_ is a member variable holding the number of ticks in a duration object, and D is the return type,

1) Equivalent to return D(*this);
2) Equivalent to return D(-rep_);

Parameters

(none)

Return value

1) A copy of this duration object.
2) A copy of this duration object, with the number of ticks negated.

Example

Run this code
#include <chrono>
#include <iostream>
 
int main()
{
    constexpr std::chrono::seconds s1(-052);
    constexpr std::chrono::seconds s2 = -s1;
 
    std::cout << "Negated " << s1 << " are " << s2 << '\n';
}

Output: 

Negated -42s are 42s

See also

 increments or decrements the tick count
(public member function)
(C++11)
 implements arithmetic operations with durations as arguments
(function template)
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/duration/operator_arith&oldid=161871