| [/ |
| / Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| / |
| / Distributed under the Boost Software License, Version 1.0. (See accompanying |
| / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| /] |
| |
| [section:TimeTraits Time traits requirements] |
| |
| In the table below, `X` denotes a time traits class for time type `Time`, `t`, |
| `t1`, and `t2` denote values of type `Time`, and `d` denotes a value of type |
| `X::duration_type`. |
| |
| [table TimeTraits requirements |
| [[expression] [return type] [assertion/note\npre/post-condition]] |
| [ |
| [`X::time_type`] |
| [`Time`] |
| [ |
| Represents an absolute time. Must support default construction, and meet |
| the requirements for `CopyConstructible` and `Assignable`. |
| ] |
| ] |
| [ |
| [`X::duration_type`] |
| [] |
| [ |
| Represents the difference between two absolute times. Must support |
| default construction, and meet the requirements for `CopyConstructible` |
| and `Assignable`. A duration can be positive, negative, or zero. |
| ] |
| ] |
| [ |
| [`X::now();`] |
| [`time_type`] |
| [ |
| Returns the current time. |
| ] |
| ] |
| [ |
| [`X::add(t, d);`] |
| [`time_type`] |
| [ |
| Returns a new absolute time resulting from adding the duration `d` to the |
| absolute time `t`. |
| ] |
| ] |
| [ |
| [`X::subtract(t1, t2);`] |
| [`duration_type`] |
| [ |
| Returns the duration resulting from subtracting `t2` from `t1`. |
| ] |
| ] |
| [ |
| [`X::less_than(t1, t2);`] |
| [`bool`] |
| [ |
| Returns whether `t1` is to be treated as less than `t2`. |
| ] |
| ] |
| [ |
| [`X::to_posix_duration(d);`] |
| [`date_time::time_duration_type`] |
| [ |
| Returns the `date_time::time_duration_type` value that most closely |
| represents the duration `d`. |
| ] |
| ] |
| ] |
| |
| [endsect] |