NAME¶

std::chrono::duration::operator+(unary), - std::chrono::duration::operator+(unary),

Synopsis¶

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

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()
{
std::chrono::seconds s1(10);
std::chrono::seconds s2 = -s1;

std::cout << "negated 10 seconds are " << s2.count() << " seconds\n";
}

Output:¶

negated 10 seconds are -10 seconds

See also¶

operator++
operator++(int) increments or decrements the tick count
operator-- (public member function)
operator--(int)
operator+
operator-
operator* implements arithmetic operations with durations as arguments
operator/ (function template)
operator%
(C++11)