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<?xml version="1.0"?>
<concept name="InputIterator" category="Iterator"><!--
Based on concepts from the SGI Standard Template Library documentation:
Copyright (c) 1996-1999
Silicon Graphics Computer Systems, Inc.
Copyright (c) 1994
Hewlett-Packard Company
--><!--
Copyright 2000-2001 University of Notre Dame du Lac.
Copyright 2001-2002 Indiana University.
Some concepts based on versions from the MTL draft manual and Boost Graph
and Property Map documentation:
Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
-->
<!--
Permission to use, copy, modify, distribute and
sell this software and its documentation for any purpose is
hereby granted without fee, provided that the above copyright
notice appears in all copies and that both that copyright
notice and this permission notice appear in supporting
documentation. Silicon Graphics makes no representations
about the suitability of this software for any purpose. It is
provided "as is" without express or implied
warranty.
-->
<param name="Iter" role="iterator-type"/>
<use-header name="iterator"/>
<models-sentence>The iterator type <arg num="1"/> must be a model of <self/>.</models-sentence>
<description>
<para>An input iterator is an iterator that can read through a sequence of
values. It is single-pass (old values of the iterator cannot be
re-used), and read-only.</para>
<para>An input iterator represents a position in a sequence. Therefore, the
iterator can point into the sequence (returning a value when dereferenced
and being incrementable), or be off-the-end (and not dereferenceable or
incrementable).</para>
</description>
<refines const="no" concept="Assignable"/>
<refines const="no" concept="DefaultConstructible"/>
<refines const="no" concept="EqualityComparable"/>
<notation variables="i j">
<sample-value>
<type name="Iter"/>
</sample-value>
</notation>
<associated-type name="value_type">
<get-member-type name="value_type">
<apply-template name="std::iterator_traits">
<type name="Iter"/>
</apply-template>
</get-member-type>
<description><simpara>The value type of the iterator (not necessarily what
<code>*i</code> returns)</simpara></description>
</associated-type>
<associated-type name="difference_type">
<get-member-type name="difference_type">
<apply-template name="std::iterator_traits">
<type name="Iter"/>
</apply-template>
</get-member-type>
<description><simpara>The difference type of the iterator</simpara></description>
</associated-type>
<associated-type name="category">
<get-member-type name="iterator_category">
<apply-template name="std::iterator_traits">
<type name="Iter"/>
</apply-template>
</get-member-type>
<description><simpara>The category of the iterator</simpara></description>
</associated-type>
<notation variables="x">
<sample-value>
<type name="value_type"/>
</sample-value>
</notation>
<valid-type-expression name="Category tag">
<description/>
<type name="category"/>
<return-type>
<derived-from testable="yes">
<type name="std::input_iterator_tag"/>
</derived-from>
<models-as-first-arg const="no" testable="yes" concept="DefaultConstructible"/>
<models-as-first-arg const="no" testable="yes" concept="CopyConstructible"/>
</return-type>
</valid-type-expression>
<valid-type-expression name="Value type copy constructibility">
<description/>
<type name="value_type"/>
<return-type>
<models-as-first-arg const="no" testable="yes" concept="CopyConstructible"/>
</return-type>
</valid-type-expression>
<valid-type-expression name="Difference type properties">
<description/>
<type name="difference_type"/>
<return-type>
<models-as-first-arg const="no" testable="yes" concept="SignedInteger"/>
</return-type>
</valid-type-expression>
<valid-expression name="Dereference">
<dereference>
<sample-value><type name="Iter"/></sample-value>
</dereference>
<return-type>
<convertible-to testable="yes"><type name="value_type"/></convertible-to>
</return-type>
<precondition><code>i</code> is incrementable (not
off-the-end)</precondition>
</valid-expression>
<valid-expression name="Preincrement">
<preincrement>
<sample-value><reference-to><type name="Iter"/></reference-to></sample-value>
</preincrement>
<return-type>
<require-same-type testable="yes">
<reference-to><type name="Iter"/></reference-to>
</require-same-type>
</return-type>
<precondition><code>i</code> is incrementable (not
off-the-end)</precondition>
</valid-expression>
<valid-expression name="Postincrement">
<postincrement>
<sample-value><reference-to><type name="Iter"/></reference-to></sample-value>
</postincrement>
<return-type/>
<precondition><code>i</code> is incrementable (not
off-the-end)</precondition>
<semantics>Equivalent to <code>(void)(++i)</code></semantics>
<postcondition><code>i</code> is dereferenceable or
off-the-end</postcondition>
</valid-expression>
<valid-expression name="Postincrement and dereference">
<dereference>
<postincrement>
<sample-value><reference-to><type name="Iter"/></reference-to></sample-value>
</postincrement>
</dereference>
<return-type>
<convertible-to testable="yes"><type name="value_type"/></convertible-to>
</return-type>
<precondition><code>i</code> is incrementable (not
off-the-end)</precondition>
<semantics>Equivalent to <code>{value_type t = *i; ++i; return t;}</code></semantics>
<postcondition><code>i</code> is dereferenceable or
off-the-end</postcondition>
</valid-expression>
<complexity>
All iterator operations must take amortized constant time.
</complexity>
<example-model>
<type name="std::istream_iterator"/>
</example-model>
<see-also concept="OutputIterator"/>
<see-also concept="ForwardIterator"/>
</concept>
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