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

From cppreference.com
< cpp‎ | chrono‎ | duration
 
 
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duration& operator++();
(1) (since C++11)
(constexpr since C++17)
duration operator++( int );
(2) (since C++11)
(constexpr since C++17)
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_--);.

Contents

[edit] Parameters

(none)

[edit] Return value

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

[edit] Example

#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

[edit] See also

implements compound assignment between two durations
(public member function) [edit]
implements arithmetic operations with durations as arguments
(function template) [edit]