From Jason Turner

[time.cal.wd.members]

C++17 → C++20 2.4 KB 112 lines
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C++ Weekly: Ep 397

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tmp/tmpoqpolbm5/{from.md → to.md} RENAMED
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+ #### Member functions <a id="time.cal.wd.members">[[time.cal.wd.members]]</a>
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+
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+ ``` cpp
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+ constexpr explicit weekday(unsigned wd) noexcept;
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+ ```
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+
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+ *Effects:* Initializes `wd_` with `wd == 7 ? 0 : wd`. The value held is
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+ unspecified if `wd` is not in the range \[`0`, `255`\].
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+
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+ ``` cpp
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+ constexpr weekday(const sys_days& dp) noexcept;
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+ ```
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+
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+ *Effects:* Computes what day of the week corresponds to the `sys_days`
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+ `dp`, and initializes that day of the week in `wd_`.
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+
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+ [*Example 1*: If `dp` represents 1970-01-01, the constructed `weekday`
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+ represents Thursday by storing `4` in `wd_`. — *end example*]
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+
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+ ``` cpp
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+ constexpr explicit weekday(const local_days& dp) noexcept;
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+ ```
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+
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+ *Effects:* Computes what day of the week corresponds to the `local_days`
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+ `dp`, and initializes that day of the week in `wd_`.
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+
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+ *Ensures:* The value is identical to that constructed from
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+ `sys_days{dp.time_since_epoch()}`.
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+
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+ ``` cpp
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+ constexpr weekday& operator++() noexcept;
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+ ```
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+
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+ *Effects:* `*this += days{1}`.
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+
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+ *Returns:* `*this`.
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+
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+ ``` cpp
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+ constexpr weekday operator++(int) noexcept;
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+ ```
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+
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+ *Effects:* `++(*this)`.
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+
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+ *Returns:* A copy of `*this` as it existed on entry to this member
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+ function.
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+
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+ ``` cpp
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+ constexpr weekday& operator--() noexcept;
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+ ```
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+
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+ *Effects:* `*this -= days{1}`.
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+
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+ *Returns:* `*this`.
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+
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+ ``` cpp
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+ constexpr weekday operator--(int) noexcept;
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+ ```
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+
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+ *Effects:* `–(*this)`.
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+
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+ *Returns:* A copy of `*this` as it existed on entry to this member
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+ function.
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+
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+ ``` cpp
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+ constexpr weekday& operator+=(const days& d) noexcept;
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+ ```
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+
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+ *Effects:* `*this = *this + d`.
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+
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+ *Returns:* `*this`.
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+
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+ ``` cpp
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+ constexpr weekday& operator-=(const days& d) noexcept;
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+ ```
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+
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+ *Effects:* `*this = *this - d`.
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+
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+ *Returns:* `*this`.
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+
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+ ``` cpp
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+ constexpr unsigned c_encoding() const noexcept;
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+ ```
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+
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+ *Returns:* `wd_`.
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+
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+ ``` cpp
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+ constexpr unsigned iso_encoding() const noexcept;
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+ ```
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+
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+ *Returns:* `wd_ == 0u ? 7u : wd_`.
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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:* `wd_ <= 6`.
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+
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+ ``` cpp
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+ constexpr weekday_indexed operator[](unsigned index) const noexcept;
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+ ```
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+
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+ *Returns:* `{*this, index}`.
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+
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+ ``` cpp
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+ constexpr weekday_last operator[](last_spec) const noexcept;
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+ ```
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+
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+ *Returns:* `weekday_last{*this}`.
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+