std::chrono::duration<Rep,Period>::operator++, std::chrono::duration<Rep,Period>::

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duration& operator++();
 (1) (since C++11)
(constexpr since C++17)
duration operator++( int );
 (2) (since C++11)
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duration& operator--();
 (3) (since C++11)
(constexpr since C++17)
duration operator--( int );
 (4) (since C++11)
(constexpr since C++17)

Increments or decrements the number of ticks for this duration.

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

1) Equivalent to ++rep_; return *this;
2) Equivalent to return duration(rep_++)
3) Equivalent to --rep_; return *this;
4) Equivalent to return duration(rep_--);

Parameters

(none)

Return value

1,3) A reference to this duration after modification.
2,4) A copy of the duration made before modification.

Example

Run this code
#include <chrono>
#include <iostream>
 
int main()
{
    std::chrono::hours h(1);
    std::chrono::minutes m = ++h;
    m--;
    std::cout << m.count() << " minutes\n";
}

Output: 

119 minutes

See also

 implements compound assignment between two durations
(public member function)
(C++11)
 implements arithmetic operations with durations as arguments
(function template)
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