29 Time library [time]

29.8 The civil calendar [time.cal]

29.8.4 Class month [time.cal.month]

29.8.4.2 Member functions [time.cal.month.members]

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constexpr explicit month(unsigned m) noexcept;
1
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Effects: Initializes m_ with m.
The value held is unspecified if m is not in the range [0, 255].
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constexpr month& operator++() noexcept;
2
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Effects: *this += months{1}.
3
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Returns: *this.
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constexpr month 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 month& operator--() noexcept;
6
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Effects: *this -= months{1}.
7
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Returns: *this.
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constexpr month 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 month& operator+=(const months& m) noexcept;
10
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Effects: *this = *this + m.
11
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Returns: *this.
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constexpr month& operator-=(const months& m) noexcept;
12
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Effects: *this = *this - m.
13
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Returns: *this.
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constexpr explicit operator unsigned() const noexcept;
14
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Returns: m_.
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constexpr bool ok() const noexcept;
15
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Returns: 1 <= m_ && m_ <= 12.