From Jason Turner

[time.cal.mwdlast]

C++17 → C++20 2.6 KB 90 lines
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Markdown: C++17 | C++20
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tmp/tmpm6o3pi26/{from.md → to.md} RENAMED
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+ ### Class `month_weekday_last` <a id="time.cal.mwdlast">[[time.cal.mwdlast]]</a>
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+
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+ #### Overview <a id="time.cal.mwdlast.overview">[[time.cal.mwdlast.overview]]</a>
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+
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+ ``` cpp
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+ namespace std::chrono {
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+ class month_weekday_last {
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+ chrono::month m_; // exposition only
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+ chrono::weekday_last wdl_; // exposition only
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+ public:
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+ constexpr month_weekday_last(const chrono::month& m,
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+ const chrono::weekday_last& wdl) noexcept;
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+
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+ constexpr chrono::month month() const noexcept;
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+ constexpr chrono::weekday_last weekday_last() const noexcept;
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+ constexpr bool ok() const noexcept;
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+ };
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+ }
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+ ```
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+
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+ `month_weekday_last` represents the last weekday of a month, of an as
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+ yet unspecified year. To do this the `month_weekday_last` stores a
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+ `month` and a `weekday_last`.
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+
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+ [*Example 1*:
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+
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+ ``` cpp
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+ constexpr auto mwd
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+ = February/Tuesday[last]; // mwd is the last Tuesday of February of an as yet unspecified year
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+ static_assert(mwd.month() == February);
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+ static_assert(mwd.weekday_last() == Tuesday[last]);
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+ ```
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+
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+ — *end example*]
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+
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+ `month_weekday_last` is a trivially copyable and standard-layout class
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+ type.
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+
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+ #### Member functions <a id="time.cal.mwdlast.members">[[time.cal.mwdlast.members]]</a>
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+
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+ ``` cpp
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+ constexpr month_weekday_last(const chrono::month& m,
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+ const chrono::weekday_last& wdl) noexcept;
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+ ```
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+
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+ *Effects:* Initializes `m_` with `m`, and `wdl_` with `wdl`.
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+
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+ ``` cpp
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+ constexpr chrono::month month() const noexcept;
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+ ```
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+
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+ *Returns:* `m_`.
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+
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+ ``` cpp
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+ constexpr chrono::weekday_last weekday_last() const noexcept;
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+ ```
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+
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+ *Returns:* `wdl_`.
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+
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+ ``` cpp
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+ constexpr bool ok() const noexcept;
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+ ```
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+
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+ *Returns:* `m_.ok() && wdl_.ok()`.
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+
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+ #### Non-member functions <a id="time.cal.mwdlast.nonmembers">[[time.cal.mwdlast.nonmembers]]</a>
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+
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+ ``` cpp
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+ constexpr bool operator==(const month_weekday_last& x, const month_weekday_last& y) noexcept;
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+ ```
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+
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+ *Returns:*
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+ `x.month() == y.month() && x.weekday_last() == y.weekday_last()`.
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+
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+ ``` cpp
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+ template<class charT, class traits>
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+ basic_ostream<charT, traits>&
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+ operator<<(basic_ostream<charT, traits>& os, const month_weekday_last& mwdl);
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+ ```
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+
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+ *Effects:* Equivalent to:
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+
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+ ``` cpp
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+ return os << format(os.getloc(), STATICALLY-WIDEN<charT>("{}/{}"),
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+ mwdl.month(), mwdl.weekday_last());
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+ ```
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+