std::chrono::year_month::operator+=, std::chrono::year_month::operator-=
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< cpp | chrono | year month
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std::chrono::year_month
Member functions
year_month::operator+=year_month::operator-=
Nonmember functions
Helper classes
(C++26)
constexpr std::chrono::year_month &
operator+=( const std::chrono::years & dy ) const noexcept;
(1)
(since C++20)
operator+=( const std::chrono::years & dy ) const noexcept;
constexpr std::chrono::year_month &
operator+=( const std::chrono::months & dm ) const noexcept;
(2)
(since C++20)
operator+=( const std::chrono::months & dm ) const noexcept;
constexpr std::chrono::year_month &
operator-=( const std::chrono::years & dy ) const noexcept;
(3)
(since C++20)
operator-=( const std::chrono::years & dy ) const noexcept;
constexpr std::chrono::year_month &
operator-=( const std::chrono::months & dm ) const noexcept;
(4)
(since C++20)
operator-=( const std::chrono::months & dm ) const noexcept;
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)); }