27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.18 Conventional syntax operators [time.cal.operators]

1
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A set of overloaded operator/ functions provides a conventional syntax for the creation of civil calendar dates.
2
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[ Note
:
The year, month, and day are accepted in any of the following 3 orders:
year/month/day
month/day/year
day/month/year
Anywhere a day is required, any of the following can also be specified:
last
weekday[i]
weekday[last]
— end note
 ]
3
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[ Note
:
Partial-date types such as year_­month and month_­day can be created by not applying the second division operator for any of the three orders.
For example:
year_month ym = 2015y/April;
month_day md1 = April/4;
month_day md2 = 4d/April;
— end note
 ]
4
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[ Example
: 
auto a = 2015/4/4;          // a == int(125)
auto b = 2015y/4/4;         // b == year_­month_­day{year(2015), month(4), day(4)}
auto c = 2015y/4d/April;    // error: no viable operator/ for first /
auto d = 2015/April/4;      // error: no viable operator/ for first /
— end example
 ]
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constexpr year_month operator/(const year& y, const month& m) noexcept;
5
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Returns: {y, m}.
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constexpr year_month operator/(const year& y, int m) noexcept;
6
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Returns: y / month(m).
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constexpr month_day operator/(const month& m, const day& d) noexcept;
7
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Returns: {m, d}.
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constexpr month_day operator/(const month& m, int d) noexcept;
8
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Returns: m / day(d).
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constexpr month_day operator/(int m, const day& d) noexcept;
9
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Returns: month(m) / d.
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constexpr month_day operator/(const day& d, const month& m) noexcept;
10
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Returns: m / d.
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constexpr month_day operator/(const day& d, int m) noexcept;
11
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Returns: month(m) / d.
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constexpr month_day_last operator/(const month& m, last_spec) noexcept;
12
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Returns: month_­day_­last{m}.
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constexpr month_day_last operator/(int m, last_spec) noexcept;
13
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Returns: month(m) / last.
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constexpr month_day_last operator/(last_spec, const month& m) noexcept;
14
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Returns: m / last.
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constexpr month_day_last operator/(last_spec, int m) noexcept;
15
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Returns: month(m) / last.
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constexpr month_weekday operator/(const month& m, const weekday_indexed& wdi) noexcept;
16
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Returns: {m, wdi}.
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constexpr month_weekday operator/(int m, const weekday_indexed& wdi) noexcept;
17
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Returns: month(m) / wdi.
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constexpr month_weekday operator/(const weekday_indexed& wdi, const month& m) noexcept;
18
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Returns: m / wdi.
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constexpr month_weekday operator/(const weekday_indexed& wdi, int m) noexcept;
19
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Returns: month(m) / wdi.
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constexpr month_weekday_last operator/(const month& m, const weekday_last& wdl) noexcept;
20
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Returns: {m, wdl}.
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constexpr month_weekday_last operator/(int m, const weekday_last& wdl) noexcept;
21
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Returns: month(m) / wdl.
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constexpr month_weekday_last operator/(const weekday_last& wdl, const month& m) noexcept;
22
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Returns: m / wdl.
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constexpr month_weekday_last operator/(const weekday_last& wdl, int m) noexcept;
23
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Returns: month(m) / wdl.
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constexpr year_month_day operator/(const year_month& ym, const day& d) noexcept;
24
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Returns: {ym.year(), ym.month(), d}.
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constexpr year_month_day operator/(const year_month& ym, int d) noexcept;
25
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Returns: ym / day(d).
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constexpr year_month_day operator/(const year& y, const month_day& md) noexcept;
26
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Returns: y / md.month() / md.day().
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constexpr year_month_day operator/(int y, const month_day& md) noexcept;
27
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Returns: year(y) / md.
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constexpr year_month_day operator/(const month_day& md, const year& y) noexcept;
28
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Returns: y / md.
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constexpr year_month_day operator/(const month_day& md, int y) noexcept;
29
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Returns: year(y) / md.
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constexpr year_month_day_last operator/(const year_month& ym, last_spec) noexcept;
30
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Returns: {ym.year(), month_­day_­last{ym.month()}}.
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constexpr year_month_day_last operator/(const year& y, const month_day_last& mdl) noexcept;
31
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Returns: {y, mdl}.
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constexpr year_month_day_last operator/(int y, const month_day_last& mdl) noexcept;
32
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Returns: year(y) / mdl.
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constexpr year_month_day_last operator/(const month_day_last& mdl, const year& y) noexcept;
33
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Returns: y / mdl.
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constexpr year_month_day_last operator/(const month_day_last& mdl, int y) noexcept;
34
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Returns: year(y) / mdl.
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constexpr year_month_weekday operator/(const year_month& ym, const weekday_indexed& wdi) noexcept;
35
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Returns: {ym.year(), ym.month(), wdi}.
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constexpr year_month_weekday operator/(const year& y, const month_weekday& mwd) noexcept;
36
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Returns: {y, mwd.month(), mwd.weekday_­indexed()}.
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constexpr year_month_weekday operator/(int y, const month_weekday& mwd) noexcept;
37
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Returns: year(y) / mwd.
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constexpr year_month_weekday operator/(const month_weekday& mwd, const year& y) noexcept;
38
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Returns: y / mwd.
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constexpr year_month_weekday operator/(const month_weekday& mwd, int y) noexcept;
39
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Returns: year(y) / mwd.
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constexpr year_month_weekday_last operator/(const year_month& ym, const weekday_last& wdl) noexcept;
40
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Returns: {ym.year(), ym.month(), wdl}.
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constexpr year_month_weekday_last operator/(const year& y, const month_weekday_last& mwdl) noexcept;
41
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Returns: {y, mwdl.month(), mwdl.weekday_­last()}.
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constexpr year_month_weekday_last operator/(int y, const month_weekday_last& mwdl) noexcept;
42
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Returns: year(y) / mwdl.
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constexpr year_month_weekday_last operator/(const month_weekday_last& mwdl, const year& y) noexcept;
43
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Returns: y / mwdl.
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constexpr year_month_weekday_last operator/(const month_weekday_last& mwdl, int y) noexcept;
44
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Returns: year(y) / mwdl.