std::chrono::duration::operator+=, -=, *=, /=, %=

 

C++

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Technical Specifications

 

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

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optional

any

variant

in_placein_place_typein_place_indexin_place_tin_place_type_tin_place_index_t

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pair

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duration (C++11)

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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

 

	(1)
duration& operator+=(const duration& d);			(until C++17)
constexpr duration& operator+=(const duration& d);			(since C++17)
		(2)
duration& operator-=(const duration& d);				(until C++17)
constexpr duration& operator-=(const duration& d);				(since C++17)
			(3)
duration& operator*=(const rep& rhs);					(until C++17)
constexpr duration& operator*=(const rep& rhs);					(since C++17)
				(4)
duration& operator/=(const rep& rhs);						(until C++17)
constexpr duration& operator/=(const rep& rhs);						(since C++17)
					(5)
duration& operator%=(const rep& rhs);							(until C++17)
constexpr duration& operator%=(const rep& rhs);							(since C++17)
						(6)
duration& operator%=(const duration& rhs);								(until C++17)
constexpr duration& operator%=(const duration& rhs);								(since C++17)

Performs compound assignments between two durations with the same period or between a duration and a tick count value.

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

1) Equivalent to rep_ += d.count(); return *this;

2) Equivalent to rep_ -= d.count(); return *this;

3) Equivalent to rep_ *= rhs; return *this;

4) Equivalent to rep_ /= rhs; return *this;

5) Equivalent to rep_ %= rhs; return *this;

6) Equivalent to rep_ %= d.count(); return *this;

Parameters

d	-	duration on the right-hand side of the operator
rhs	-	number of ticks on the right-hand side of the operator

Return value

A reference to this duration after modification

Example

Run this code

#include <chrono>
#include <iostream>
 
int main()
{
    std::chrono::minutes m(11);
    m *= 2;
    m += std::chrono::hours(10); // hours implicitly convert to minutes
    std::cout << m.count() << " minutes equals "
              << std::chrono::duration_cast<std::chrono::hours>(m).count() 
              << " hours and ";
    m %= std::chrono::hours(1);
    std::cout << m.count() << " minutes\n";
}

Output:

622 minutes equals 10 hours and 22 minutes

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)