mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-10-28 19:43:15 -04:00
32 lines
2.5 KiB
ReStructuredText
32 lines
2.5 KiB
ReStructuredText
.. Copyright David Abrahams 2006. 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)
|
|
|
|
Forward Traversal Concept
|
|
.........................
|
|
|
|
A class or built-in type ``X`` models the *Forward Traversal*
|
|
concept if, in addition to ``X`` meeting the requirements of Default
|
|
Constructible and Single Pass Iterator, the following expressions are
|
|
valid and respect the stated semantics.
|
|
|
|
+--------------------------------------------------------------------------------------------------------+
|
|
|Forward Traversal Iterator Requirements (in addition to Default Constructible and Single Pass Iterator) |
|
|
+---------------------------------------+-----------------------------------+----------------------------+
|
|
|Expression |Return Type |Assertion/Note |
|
|
+=======================================+===================================+============================+
|
|
|``X u;`` |``X&`` |note: ``u`` may have a |
|
|
| | |singular value. |
|
|
+---------------------------------------+-----------------------------------+----------------------------+
|
|
|``++r`` |``X&`` |``r == s`` and ``r`` is |
|
|
| | |dereferenceable implies |
|
|
| | |``++r == ++s.`` |
|
|
+---------------------------------------+-----------------------------------+----------------------------+
|
|
|``iterator_traits<X>::difference_type``|A signed integral type representing| |
|
|
| |the distance between iterators | |
|
|
| | | |
|
|
+---------------------------------------+-----------------------------------+----------------------------+
|
|
|``iterator_traversal<X>::type`` |Convertible to | |
|
|
| |``forward_traversal_tag`` | |
|
|
+---------------------------------------+-----------------------------------+----------------------------+
|