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

	(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

#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

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

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

Parameters

Return value

Example

See also