std::chrono::duration<Rep,Period>::operator+=, -=, *=, /=, %=

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

# Declarations

duration& operator+=( const duration& d );

(since C++11) (constexpr since C++17)

duration& operator-=( const duration& d );

(since C++11) (constexpr since C++17)

duration& operator*=( const rep& rhs );

(since C++11) (constexpr since C++17)

duration& operator/=( const rep& rhs );

(since C++11) (constexpr since C++17)

duration& operator%=( const rep& rhs );

(since C++11) (constexpr since C++17)

duration& operator%=( const duration& rhs );

(since C++11) (constexpr since C++17)

# Parameters

# Return value

A reference to this duration after modification.

# Example

#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";
}

# See also