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

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< cpp‎ | chrono‎ | duration
 
 
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(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_);.

Contents

[edit] Parameters

(none)

[edit] Return value

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

[edit] Example

#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

[edit] See also

increments or decrements the tick count
(public member function) [edit]
implements arithmetic operations with durations as arguments
(function template) [edit]