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

std::chrono::year_month::operator+=, std::chrono::year_month::operator-= - cppreference.com

[edit template] 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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year_month_day

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weekday_indexed

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C-style date and time [edit] std::chrono::year_month Member functions year_month::year_month year_month::yearyear_month::month

year_month::operator+=year_month::operator-=

year_month::ok Nonmember functions operator==operator<=> operator+operator- operator<< from_stream Helper classes formatter<std::chrono::year_month> hash<std::chrono::year_month>

(C++26)

[edit] constexpr std::chrono::year_month& operator+=( const std::chrono::years& dy ) const noexcept; (1) (since C++20) constexpr std::chrono::year_month& operator+=( const std::chrono::months& dm ) const noexcept; (2) (since C++20) constexpr std::chrono::year_month& operator-=( const std::chrono::years& dy ) const noexcept; (3) (since C++20) constexpr std::chrono::year_month& operator-=( const std::chrono::months& dm ) const noexcept; (4) (since C++20)

Modifies the time point *this represents by the duration dy or dm.

1) Equivalent to *this = *this + dy;.

2) Equivalent to *this = *this + dm;.

3) Equivalent to *this = *this - dy;.

4) Equivalent to *this = *this - dm;.

For durations that are convertible to both std::chrono::years and std::chrono::months, the years overloads (1,3) are preferred if the call would otherwise be ambiguous.

[edit] Example

Run this code

#include <cassert>
#include <chrono>
 
int main()
{
    auto ym{std::chrono::day(1)/7/2023};
 
    ym -= std::chrono::years{2};
    assert(ym.month() == std::chrono::July);
    assert(ym.year() == std::chrono::year(2021));
 
    ym += std::chrono::months{7};
    assert(ym.month() == std::chrono::month(2));
    assert(ym.year() == std::chrono::year(2022));
}

[edit] See also operator+operator-

(C++20)

performs arithmetic on year_month
(function) [edit]

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