30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.3 Class day [time.cal.day]

30.8.3.2 Member functions [time.cal.day.members]

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constexpr explicit day(unsigned d) noexcept;
1
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Effects: Initializes d_ with d.
The value held is unspecified if d is not in the range [0, 255].
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constexpr day& operator++() noexcept;
2
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Effects: ++d_.
3
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Returns: *this.
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constexpr day operator++(int) noexcept;
4
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Effects: ++(*this).
5
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Returns: A copy of *this as it existed on entry to this member function.
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constexpr day& operator--() noexcept;
6
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Effects: Equivalent to: --d_.
7
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Returns: *this.
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constexpr day operator--(int) noexcept;
8
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Effects: --(*this).
9
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Returns: A copy of *this as it existed on entry to this member function.
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constexpr day& operator+=(const days& d) noexcept;
10
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Effects: *this = *this + d.
11
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Returns: *this.
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constexpr day& operator-=(const days& d) noexcept;
12
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Effects: *this = *this - d.
13
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Returns: *this.
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constexpr explicit operator unsigned() const noexcept;
14
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Returns: d_.
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constexpr bool ok() const noexcept;
15
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Returns: 1 <= d_ && d_ <= 31.