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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/algorithm/../chrono/day/operator_inc_dec.html below:

std::chrono::day::operator++, std::chrono::day::operator-- - cppreference.com

C++ Compiler support Freestanding and hosted Language Standard library Standard library headers Named requirements Feature test macros (C++20) Language support library Concepts library (C++20) Diagnostics library Memory management library Metaprogramming library (C++11) General utilities library Containers library Iterators library Ranges library (C++20) Algorithms library Strings library Text processing library Numerics library Date and time library Input/output library Filesystem library (C++17) Concurrency support library (C++11) Execution control library (C++26) Technical specifications Symbols index External libraries [edit] Date and time library Time point time_point

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C-style date and time [edit] std::chrono::day Member functions day::day

day::operator++day::operator--

day::operator+=day::operator-= day::operator unsigned day::ok Nonmember functions operator==operator<=> operator+operator- operator<< from_stream operator""d Helper classes formatter<std::chrono::day> hash<std::chrono::day>

(C++26)

[edit] constexpr std::chrono::day& operator++() noexcept; (1) (since C++20) constexpr std::chrono::day operator++( int ) noexcept; (2) (since C++20) constexpr std::chrono::day& operator--() noexcept; (3) (since C++20) constexpr std::chrono::day operator--( int ) noexcept; (4) (since C++20)

Adds or subtracts 1 from the day value.

1,2)

Performs

*this += std::chrono::days{1};

.

3,4)

Performs

*this -= std::chrono::days{1};

.

Contents

[edit] Parameters

(none)

[edit] Return value

1,3) A reference to this day after modification.

2,4) A copy of the day made before modification.

[edit] Notes

If the result would be outside the range [​0​, 255], the actual stored value is unspecified.

[edit] Example

Run this code

#include <cassert>
#include <chrono>
 
int main()
{
    std::chrono::day d{15};
 
    ++d;
    assert(d == std::chrono::day(16));
 
    --d;
    assert(d == std::chrono::day(15));
}
[edit] See also operator+=operator-= adds or subtracts a number of days
(public member function) [edit] operator+operator-

(C++20)

adds or subtracts a number of days and a day, or find the difference between two days
(function) [edit]

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