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

 

C++

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Technical Specifications

 

Utilities library

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initializer_list (C++11)

bitset

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rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=

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pair

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C-style date and time

 

std::chrono::duration

Member functions
duration::duration
duration::operator=
duration::count
duration::zero
duration::min
duration::max
duration::operator+duration::operator-
duration::operator++duration::operator--
duration::operator+=duration::operator-=duration::operator*=duration::operator/=duration::operator%=
Non-member functions
operator+operator-operator*operator/operator% operator==operator!=operator<operator<=operator>operator>=	common_type duration_cast floor (C++17) ceil (C++17) round (C++17) abs (C++17) operator""h (C++14) operator""min (C++14) operator""s (C++14) operator""ms (C++14) operator""us (C++14) operator""ns (C++14)
Helper classes
treat_as_floating_point
duration_values

 

constexpr duration operator+() const;	(1)
constexpr duration operator-() const;	(2)

Implements unary plus and unary minus for the durations.

If rep_ is a member variable holding the number of ticks in a duration object,

1) Equivalent to return *this;

2) Equivalent to return duration(-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)operator--operator--(int)	increments or decrements the tick count (public member function)
operator+operator-operator*operator/operator%	implements arithmetic operations with durations as arguments (function template)