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<div class="title">std::reverse_iterator< _Iterator > Class Template Reference<div class="ingroups"><a class="el" href="a01504.html">Iterators</a></div></div> </div>
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Inheritance diagram for std::reverse_iterator< _Iterator >:</div>
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Public Types</h2></td></tr>
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typedef __traits_type::difference_type </td><td class="memItemRight" valign="bottom"><b>difference_type</b></td></tr>
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<tr class="memitem:a3d32527bfebba5c0459df1390cef50a9"><td class="memItemLeft" align="right" valign="top">typedef iterator_traits< _Iterator >::<a class="el" href="a07672.html#a3d32527bfebba5c0459df1390cef50a9">iterator_category</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a07672.html#a3d32527bfebba5c0459df1390cef50a9">iterator_category</a></td></tr>
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typedef _Iterator </td><td class="memItemRight" valign="bottom"><b>iterator_type</b></td></tr>
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typedef __traits_type::pointer </td><td class="memItemRight" valign="bottom"><b>pointer</b></td></tr>
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typedef __traits_type::reference </td><td class="memItemRight" valign="bottom"><b>reference</b></td></tr>
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<tr class="memitem:af9f36b7adb257959eef192b9282f1284"><td class="memItemLeft" align="right" valign="top">typedef iterator_traits< _Iterator >::<a class="el" href="a07672.html#af9f36b7adb257959eef192b9282f1284">value_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a07672.html#af9f36b7adb257959eef192b9282f1284">value_type</a></td></tr>
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Public Member Functions</h2></td></tr>
<tr class="memitem:a4326966837069ac59f22820fadf8ae3a"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a4326966837069ac59f22820fadf8ae3a">reverse_iterator</a> ()</td></tr>
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<tr class="memitem:a5c105d8935b69f75c65bdebc9bcef331"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a5c105d8935b69f75c65bdebc9bcef331">reverse_iterator</a> (iterator_type __x)</td></tr>
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<tr class="memitem:abcf630bfb989602beb089b2242b75cad"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#abcf630bfb989602beb089b2242b75cad">reverse_iterator</a> (const <a class="el" href="a07612.html">reverse_iterator</a> &__x)</td></tr>
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<tr class="memitem:ae754a0cb3c4328241516606ef71440b0"><td class="memTemplParams" colspan="2">template<typename _Iter > </td></tr>
<tr class="memitem:ae754a0cb3c4328241516606ef71440b0"><td class="memTemplItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="a07612.html#ae754a0cb3c4328241516606ef71440b0">reverse_iterator</a> (const <a class="el" href="a07612.html">reverse_iterator</a>< _Iter > &__x)</td></tr>
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<tr class="memitem:ad85fb13476e605fa2136ecb649190e03"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR iterator_type </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#ad85fb13476e605fa2136ecb649190e03">base</a> () const</td></tr>
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<tr class="memitem:a7af5d174f9cb1016e5028e6a8716753b"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR reference </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a7af5d174f9cb1016e5028e6a8716753b">operator*</a> () const</td></tr>
<tr class="separator:a7af5d174f9cb1016e5028e6a8716753b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a936c0491dbd3dfadfdbee626478b7009"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">reverse_iterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a936c0491dbd3dfadfdbee626478b7009">operator+</a> (difference_type __n) const</td></tr>
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<tr class="memitem:a785ca20b14ac95ee033695423ecf1d53"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">reverse_iterator</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a785ca20b14ac95ee033695423ecf1d53">operator++</a> ()</td></tr>
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<tr class="memitem:a27c37221dec91844c7a72cb9dc28441d"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">reverse_iterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a27c37221dec91844c7a72cb9dc28441d">operator++</a> (int)</td></tr>
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<tr class="memitem:a2060fd42f847719055e4b416650824ea"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">reverse_iterator</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a2060fd42f847719055e4b416650824ea">operator+=</a> (difference_type __n)</td></tr>
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<tr class="memitem:a3942515868778c8f04f5b34fd78d1fce"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">reverse_iterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a3942515868778c8f04f5b34fd78d1fce">operator-</a> (difference_type __n) const</td></tr>
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<tr class="memitem:a013970df0401622fc82f1e3b4aafeb73"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">reverse_iterator</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a013970df0401622fc82f1e3b4aafeb73">operator--</a> ()</td></tr>
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<tr class="memitem:ac7ab8ae9e2d74a1456d6d835e3de74e5"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">reverse_iterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#ac7ab8ae9e2d74a1456d6d835e3de74e5">operator--</a> (int)</td></tr>
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<tr class="memitem:a194e833ea2d84161f1bf3f996d1d1d5f"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">reverse_iterator</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a194e833ea2d84161f1bf3f996d1d1d5f">operator-=</a> (difference_type __n)</td></tr>
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<tr class="memitem:ab256f3da0cdc3212fd9f676e70fcfa74"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR pointer </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#ab256f3da0cdc3212fd9f676e70fcfa74">operator-></a> () const</td></tr>
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<tr class="memitem:a4dadeeb9101dbd3d257043519e6e35f8"><td class="memItemLeft" align="right" valign="top">_GLIBCXX17_CONSTEXPR reference </td><td class="memItemRight" valign="bottom"><a class="el" href="a07612.html#a4dadeeb9101dbd3d257043519e6e35f8">operator[]</a> (difference_type __n) const</td></tr>
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Protected Types</h2></td></tr>
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typedef iterator_traits< _Iterator > </td><td class="memItemRight" valign="bottom"><b>__traits_type</b></td></tr>
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Protected Attributes</h2></td></tr>
<tr class="memitem:a4aea370ce0c4c029d81c3a1d1dd74e80"><td class="memItemLeft" align="right" valign="top"><a id="a4aea370ce0c4c029d81c3a1d1dd74e80"></a>
_Iterator </td><td class="memItemRight" valign="bottom"><b>current</b></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<typename _Iterator><br />
class std::reverse_iterator< _Iterator ></h3>
<p>Bidirectional and random access iterators have corresponding reverse iterator adaptors that iterate through the data structure in the opposite direction. They have the same signatures as the corresponding iterators. The fundamental relation between a reverse iterator and its corresponding iterator <code>i</code> is established by the identity: </p><div class="fragment"><div class="line">&*(<a class="code" href="a07612.html#a4326966837069ac59f22820fadf8ae3a">reverse_iterator</a>(i)) == &*(i - 1)</div></div><!-- fragment --><p><em>This mapping is dictated by the fact that while there is always a pointer past the end of an array, there might not be a valid pointer before the beginning of an array.</em> [24.4.1]/1,2</p>
<p>Reverse iterators can be tricky and surprising at first. Their semantics make sense, however, and the trickiness is a side effect of the requirement that the iterators must be safe. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00101">101</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3d32527bfebba5c0459df1390cef50a9">◆ </a></span>iterator_category</h2>
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<td class="memname">typedef iterator_traits< _Iterator >::<a class="el" href="a07672.html#a3d32527bfebba5c0459df1390cef50a9">iterator_category</a> <a class="el" href="a07672.html">std::iterator</a>< iterator_traits< _Iterator >::<a class="el" href="a07672.html#a3d32527bfebba5c0459df1390cef50a9">iterator_category</a> , iterator_traits< _Iterator >::<a class="el" href="a07672.html#af9f36b7adb257959eef192b9282f1284">value_type</a> , iterator_traits< _Iterator >::difference_type , iterator_traits< _Iterator >::pointer , iterator_traits< _Iterator >::reference >::<a class="el" href="a07672.html#a3d32527bfebba5c0459df1390cef50a9">iterator_category</a></td>
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<p>One of the <a class="el" href="a01505.html">tag types</a>. </p>
<p class="definition">Definition at line <a class="el" href="a00554_source.html#l00121">121</a> of file <a class="el" href="a00554_source.html">stl_iterator_base_types.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#af9f36b7adb257959eef192b9282f1284">◆ </a></span>value_type</h2>
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<td class="memname">typedef iterator_traits< _Iterator >::<a class="el" href="a07672.html#af9f36b7adb257959eef192b9282f1284">value_type</a> <a class="el" href="a07672.html">std::iterator</a>< iterator_traits< _Iterator >::<a class="el" href="a07672.html#a3d32527bfebba5c0459df1390cef50a9">iterator_category</a> , iterator_traits< _Iterator >::<a class="el" href="a07672.html#af9f36b7adb257959eef192b9282f1284">value_type</a> , iterator_traits< _Iterator >::difference_type , iterator_traits< _Iterator >::pointer , iterator_traits< _Iterator >::reference >::<a class="el" href="a07672.html#af9f36b7adb257959eef192b9282f1284">value_type</a></td>
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<p>The type "pointed to" by the iterator. </p>
<p class="definition">Definition at line <a class="el" href="a00554_source.html#l00123">123</a> of file <a class="el" href="a00554_source.html">stl_iterator_base_types.h</a>.</p>
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<h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a4326966837069ac59f22820fadf8ae3a">◆ </a></span>reverse_iterator() <span class="overload">[1/4]</span></h2>
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template<typename _Iterator> </div>
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<td class="memname">_GLIBCXX17_CONSTEXPR <a class="el" href="a07612.html">std::reverse_iterator</a>< _Iterator >::<a class="el" href="a07612.html">reverse_iterator</a> </td>
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<p>The default constructor value-initializes member <code>current</code>. If it is a pointer, that means it is zero-initialized. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00127">127</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="a17142_source.html#l00242">std::reverse_iterator< _Iterator >::operator+()</a>, and <a class="el" href="a17142_source.html#l00264">std::reverse_iterator< _Iterator >::operator-()</a>.</p>
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<p>This iterator will move in the opposite direction that <code>x</code> does. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00133">133</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#abcf630bfb989602beb089b2242b75cad">◆ </a></span>reverse_iterator() <span class="overload">[3/4]</span></h2>
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<p>The copy constructor is normal. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00139">139</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ae754a0cb3c4328241516606ef71440b0">◆ </a></span>reverse_iterator() <span class="overload">[4/4]</span></h2>
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<p>A reverse_iterator across other types can be copied if the underlying iterator can be converted to the type of <code>current</code>. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00148">148</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ad85fb13476e605fa2136ecb649190e03">◆ </a></span>base()</h2>
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<td class="memname">_GLIBCXX17_CONSTEXPR iterator_type <a class="el" href="a07612.html">std::reverse_iterator</a>< _Iterator >::base </td>
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<dl class="section return"><dt>Returns</dt><dd><code>current</code>, the iterator used for underlying work. </dd></dl>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00155">155</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
<p class="reference">Referenced by <a class="el" href="a17142_source.html#l00302">std::operator==()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a7af5d174f9cb1016e5028e6a8716753b">◆ </a></span>operator*()</h2>
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<dl class="section return"><dt>Returns</dt><dd>A reference to the value at <code>–current</code> </dd></dl>
<p>This requires that <code>–current</code> is dereferenceable.</p>
<dl class="section warning"><dt>Warning</dt><dd>This implementation requires that for an iterator of the underlying iterator type, <code>x</code>, a reference obtained by <code>*x</code> remains valid after <code>x</code> has been modified or destroyed. This is a bug: <a href="http://gcc.gnu.org/PR51823">http://gcc.gnu.org/PR51823</a> </dd></dl>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00169">169</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a936c0491dbd3dfadfdbee626478b7009">◆ </a></span>operator+()</h2>
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<dl class="section return"><dt>Returns</dt><dd>A reverse_iterator that refers to <code>current</code> - <em>__n</em> </dd></dl>
<p>The underlying iterator must be a Random Access Iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00242">242</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
<p class="reference">References <a class="el" href="a17142_source.html#l00127">std::reverse_iterator< _Iterator >::reverse_iterator()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a785ca20b14ac95ee033695423ecf1d53">◆ </a></span>operator++() <span class="overload">[1/2]</span></h2>
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<dl class="section return"><dt>Returns</dt><dd><code>*this</code> </dd></dl>
<p>Decrements the underlying iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00192">192</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<dl class="section return"><dt>Returns</dt><dd>The original value of <code>*this</code> </dd></dl>
<p>Decrements the underlying iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00204">204</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a2060fd42f847719055e4b416650824ea">◆ </a></span>operator+=()</h2>
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<dl class="section return"><dt>Returns</dt><dd>*this</dd></dl>
<p>Moves the underlying iterator backwards <em>__n</em> steps. The underlying iterator must be a Random Access Iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00252">252</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3942515868778c8f04f5b34fd78d1fce">◆ </a></span>operator-()</h2>
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<dl class="section return"><dt>Returns</dt><dd>A reverse_iterator that refers to <code>current</code> - <em>__n</em> </dd></dl>
<p>The underlying iterator must be a Random Access Iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00264">264</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
<p class="reference">References <a class="el" href="a17142_source.html#l00127">std::reverse_iterator< _Iterator >::reverse_iterator()</a>.</p>
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<dl class="section return"><dt>Returns</dt><dd><code>*this</code> </dd></dl>
<p>Increments the underlying iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00217">217</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<dl class="section return"><dt>Returns</dt><dd>A reverse_iterator with the previous value of <code>*this</code> </dd></dl>
<p>Increments the underlying iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00229">229</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a194e833ea2d84161f1bf3f996d1d1d5f">◆ </a></span>operator-=()</h2>
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<dl class="section return"><dt>Returns</dt><dd>*this</dd></dl>
<p>Moves the underlying iterator forwards <em>__n</em> steps. The underlying iterator must be a Random Access Iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00274">274</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab256f3da0cdc3212fd9f676e70fcfa74">◆ </a></span>operator->()</h2>
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<dl class="section return"><dt>Returns</dt><dd>A pointer to the value at <code>–current</code> </dd></dl>
<p>This requires that <code>–current</code> is dereferenceable. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00183">183</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
<p class="reference">References <a class="el" href="a00422_source.html#l00047">std::__addressof()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a4dadeeb9101dbd3d257043519e6e35f8">◆ </a></span>operator[]()</h2>
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<dl class="section return"><dt>Returns</dt><dd>The value at <code>current</code> - <em>__n</em> - 1</dd></dl>
<p>The underlying iterator must be a Random Access Iterator. </p>
<p class="definition">Definition at line <a class="el" href="a17142_source.html#l00286">286</a> of file <a class="el" href="a17142_source.html">bits/stl_iterator.h</a>.</p>
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