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26<div class="titlepage"><div><div><h2 class="title" style="clear: both">
27<a name="core.alloc_construct"></a><a class="link" href="alloc_construct.html" title="alloc_construct, alloc_destroy">alloc_construct, alloc_destroy</a>
28</h2></div></div></div>
29<div class="toc"><dl class="toc">
30<dt><span class="section"><a href="alloc_construct.html#core.alloc_construct.overview">Overview</a></span></dt>
31<dt><span class="section"><a href="alloc_construct.html#core.alloc_construct.example">Example</a></span></dt>
32<dt><span class="section"><a href="alloc_construct.html#core.alloc_construct.reference">Reference</a></span></dt>
33<dt><span class="section"><a href="alloc_construct.html#core.alloc_construct.compatibility">Compatibility</a></span></dt>
34<dt><span class="section"><a href="alloc_construct.html#core.alloc_construct.acknowledgments">Acknowledgments</a></span></dt>
35</dl></div>
36<div class="simplesect">
37<div class="titlepage"><div><div><h3 class="title">
38<a name="idm45312830620864"></a>Authors</h3></div></div></div>
39<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
40          Glen Fernandes
41        </li></ul></div>
42</div>
43<div class="section">
44<div class="titlepage"><div><div><h3 class="title">
45<a name="core.alloc_construct.overview"></a><a class="link" href="alloc_construct.html#core.alloc_construct.overview" title="Overview">Overview</a>
46</h3></div></div></div>
47<p>
48        The header &lt;boost/core/alloc_construct.hpp&gt; provides function templates
49        <code class="computeroutput"><span class="identifier">alloc_construct</span></code>, <code class="computeroutput"><span class="identifier">alloc_construct_n</span></code>, <code class="computeroutput"><span class="identifier">alloc_destroy</span></code>,
50        and <code class="computeroutput"><span class="identifier">alloc_destroy_n</span></code> for allocator
51        aware and exception safe construction and destruction of objects and arrays.
52      </p>
53</div>
54<div class="section">
55<div class="titlepage"><div><div><h3 class="title">
56<a name="core.alloc_construct.example"></a><a class="link" href="alloc_construct.html#core.alloc_construct.example" title="Example">Example</a>
57</h3></div></div></div>
58<p>
59        The following example allocates storage for an array of <code class="computeroutput"><span class="identifier">n</span></code>
60        elements of <code class="computeroutput"><span class="identifier">T</span></code> using an allocator
61        <code class="computeroutput"><span class="identifier">a</span></code> and constructs <code class="computeroutput"><span class="identifier">T</span></code> elements in that storage. If any exception
62        was thrown during construction of an element, the constructed elements are
63        destroyed in reverse order.
64      </p>
65<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
66<span class="keyword">auto</span> <span class="identifier">create</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
67<span class="special">{</span>
68    <span class="keyword">auto</span> <span class="identifier">p</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">.</span><span class="identifier">allocate</span><span class="special">(</span><span class="identifier">n</span><span class="special">);</span>
69    <span class="keyword">try</span> <span class="special">{</span>
70        <span class="identifier">boost</span><span class="special">::</span><span class="identifier">alloc_construct_n</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">to_address</span><span class="special">(</span><span class="identifier">p</span><span class="special">),</span> <span class="identifier">n</span><span class="special">);</span>
71    <span class="special">}</span> <span class="keyword">catch</span> <span class="special">(...)</span> <span class="special">{</span>
72        <span class="identifier">a</span><span class="special">.</span><span class="identifier">deallocate</span><span class="special">(</span><span class="identifier">p</span><span class="special">,</span> <span class="identifier">n</span><span class="special">);</span>
73        <span class="keyword">throw</span><span class="special">;</span>
74    <span class="special">}</span>
75    <span class="keyword">return</span> <span class="identifier">p</span><span class="special">;</span>
76<span class="special">}</span>
77</pre>
78</div>
79<div class="section">
80<div class="titlepage"><div><div><h3 class="title">
81<a name="core.alloc_construct.reference"></a><a class="link" href="alloc_construct.html#core.alloc_construct.reference" title="Reference">Reference</a>
82</h3></div></div></div>
83<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
84
85<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
86<span class="keyword">void</span> <span class="identifier">alloc_destroy</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">);</span>
87
88<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
89<span class="keyword">void</span> <span class="identifier">alloc_destroy_n</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">);</span>
90
91<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Args</span><span class="special">&gt;</span>
92<span class="keyword">void</span> <span class="identifier">alloc_construct</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">Args</span><span class="special">&amp;&amp;...</span> <span class="identifier">args</span><span class="special">);</span>
93
94<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
95<span class="keyword">void</span> <span class="identifier">alloc_construct_n</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">);</span>
96
97<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
98<span class="keyword">void</span> <span class="identifier">alloc_construct_n</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">l</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">m</span><span class="special">);</span>
99
100<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">I</span><span class="special">&gt;</span>
101<span class="keyword">void</span> <span class="identifier">alloc_construct_n</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">I</span> <span class="identifier">begin</span><span class="special">);</span>
102
103<span class="special">}</span> <span class="comment">/* boost */</span>
104</pre>
105<div class="section">
106<div class="titlepage"><div><div><h4 class="title">
107<a name="core.alloc_construct.reference.functions"></a><a class="link" href="alloc_construct.html#core.alloc_construct.reference.functions" title="Functions">Functions</a>
108</h4></div></div></div>
109<div class="variablelist">
110<p class="title"><b></b></p>
111<dl class="variablelist">
112<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">alloc_destroy</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">);</span></code></span></dt>
113<dd><div class="variablelist">
114<p class="title"><b></b></p>
115<dl class="variablelist">
116<dt><span class="term">Requires</span></dt>
117<dd><p>
118                      <code class="computeroutput"><span class="identifier">A</span></code> is an <span class="emphasis"><em>Allocator</em></span>
119                    </p></dd>
120<dt><span class="term">Effects</span></dt>
121<dd><p>
122                      <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span>
123                      <span class="identifier">p</span><span class="special">)</span></code>.
124                    </p></dd>
125</dl>
126</div></dd>
127<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">alloc_destroy_n</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>
128            <span class="identifier">n</span><span class="special">);</span></code></span></dt>
129<dd><div class="variablelist">
130<p class="title"><b></b></p>
131<dl class="variablelist">
132<dt><span class="term">Requires</span></dt>
133<dd><p>
134                      <code class="computeroutput"><span class="identifier">A</span></code> is an <span class="emphasis"><em>Allocator</em></span>
135                    </p></dd>
136<dt><span class="term">Effects</span></dt>
137<dd><p>
138                      Destroys each <code class="computeroutput"><span class="identifier">i</span></code>-th
139                      element in reverse order by calling <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">p</span><span class="special">[</span><span class="identifier">i</span><span class="special">])</span></code>.
140                    </p></dd>
141</dl>
142</div></dd>
143<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Args</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">alloc_construct</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">Args</span><span class="special">&amp;&amp;...</span>
144            <span class="identifier">args</span><span class="special">);</span></code></span></dt>
145<dd><div class="variablelist">
146<p class="title"><b></b></p>
147<dl class="variablelist">
148<dt><span class="term">Requires</span></dt>
149<dd><p>
150                      <code class="computeroutput"><span class="identifier">A</span></code> is an <span class="emphasis"><em>Allocator</em></span>
151                    </p></dd>
152<dt><span class="term">Effects</span></dt>
153<dd><p>
154                      <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">construct</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span>
155                      <span class="identifier">p</span><span class="special">,</span>
156                      <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="identifier">Args</span><span class="special">&gt;(</span><span class="identifier">args</span><span class="special">)...)</span></code>.
157                    </p></dd>
158</dl>
159</div></dd>
160<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">alloc_construct_n</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>
161            <span class="identifier">n</span><span class="special">);</span></code></span></dt>
162<dd><div class="variablelist">
163<p class="title"><b></b></p>
164<dl class="variablelist">
165<dt><span class="term">Requires</span></dt>
166<dd><p>
167                      <code class="computeroutput"><span class="identifier">A</span></code> is an <span class="emphasis"><em>Allocator</em></span>
168                    </p></dd>
169<dt><span class="term">Effects</span></dt>
170<dd><p>
171                      Constructs each <code class="computeroutput"><span class="identifier">i</span></code>-th
172                      element in order by calling <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">construct</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">p</span><span class="special">[</span><span class="identifier">i</span><span class="special">])</span></code>.
173                    </p></dd>
174<dt><span class="term">Remarks</span></dt>
175<dd><p>
176                      If an exception is thrown destroys each already constructed
177                      <code class="computeroutput"><span class="identifier">j</span></code>-th element
178                      in reverse order by calling <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">p</span><span class="special">[</span><span class="identifier">j</span><span class="special">])</span></code>.
179                    </p></dd>
180</dl>
181</div></dd>
182<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">alloc_construct_n</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>
183            <span class="identifier">n</span><span class="special">,</span>
184            <span class="keyword">const</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">l</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>
185            <span class="identifier">m</span><span class="special">);</span></code></span></dt>
186<dd><div class="variablelist">
187<p class="title"><b></b></p>
188<dl class="variablelist">
189<dt><span class="term">Requires</span></dt>
190<dd><p>
191                      <code class="computeroutput"><span class="identifier">A</span></code> is an <span class="emphasis"><em>Allocator</em></span>
192                    </p></dd>
193<dt><span class="term">Effects</span></dt>
194<dd><p>
195                      Constructs each <code class="computeroutput"><span class="identifier">i</span></code>-th
196                      element in order by calling <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">construct</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">p</span><span class="special">[</span><span class="identifier">i</span><span class="special">],</span>
197                      <span class="identifier">l</span><span class="special">[</span><span class="identifier">i</span> <span class="special">%</span>
198                      <span class="identifier">m</span><span class="special">])</span></code>.
199                    </p></dd>
200<dt><span class="term">Remarks</span></dt>
201<dd><p>
202                      If an exception is thrown destroys each already constructed
203                      <code class="computeroutput"><span class="identifier">j</span></code>-th element
204                      in reverse order by calling <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">p</span><span class="special">[</span><span class="identifier">j</span><span class="special">])</span></code>.
205                    </p></dd>
206</dl>
207</div></dd>
208<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">I</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">alloc_construct_n</span><span class="special">(</span><span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">I</span> <span class="identifier">begin</span><span class="special">);</span></code></span></dt>
209<dd><div class="variablelist">
210<p class="title"><b></b></p>
211<dl class="variablelist">
212<dt><span class="term">Requires</span></dt>
213<dd><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
214<li class="listitem">
215                          <code class="computeroutput"><span class="identifier">A</span></code> is an
216                          <span class="emphasis"><em>Allocator</em></span>
217                        </li>
218<li class="listitem">
219                          <code class="computeroutput"><span class="identifier">I</span></code> is an
220                          <span class="emphasis"><em>InputIterator</em></span>
221                        </li>
222</ul></div></dd>
223<dt><span class="term">Effects</span></dt>
224<dd>
225                      Constructs each <code class="computeroutput"><span class="identifier">i</span></code>-th
226                      element in order by calling <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">construct</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">p</span><span class="special">[</span><span class="identifier">i</span><span class="special">],</span>
227                      <span class="special">*</span><span class="identifier">begin</span><span class="special">++])</span></code>.
228                    </dd>
229<dt><span class="term">Remarks</span></dt>
230<dd><p>
231                      If an exception is thrown destroys each already constructed
232                      <code class="computeroutput"><span class="identifier">j</span></code>-th element
233                      in reverse order by calling <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_traits</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;::</span><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">p</span><span class="special">[</span><span class="identifier">j</span><span class="special">])</span></code>.
234                    </p></dd>
235</dl>
236</div></dd>
237</dl>
238</div>
239</div>
240</div>
241<div class="section">
242<div class="titlepage"><div><div><h3 class="title">
243<a name="core.alloc_construct.compatibility"></a><a class="link" href="alloc_construct.html#core.alloc_construct.compatibility" title="Compatibility">Compatibility</a>
244</h3></div></div></div>
245<p>
246        When <code class="computeroutput"><span class="identifier">BOOST_NO_CXX11_ALLOCATOR</span></code>
247        is defined, and the C++11 allocator model is not supported, these functions
248        invoke constructors and destructors directly without going through the supplied
249        allocator.
250      </p>
251</div>
252<div class="section">
253<div class="titlepage"><div><div><h3 class="title">
254<a name="core.alloc_construct.acknowledgments"></a><a class="link" href="alloc_construct.html#core.alloc_construct.acknowledgments" title="Acknowledgments">Acknowledgments</a>
255</h3></div></div></div>
256<p>
257        Glen Fernandes originally implemented this functionality in Boost.Smart_Ptr
258        and later moved these functions to Boost.Core for use in other Boost libraries,
259        such as Boost.Multi_Array and Boost.Histogram.
260      </p>
261</div>
262</div>
263<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
264<td align="left"></td>
265<td align="right"><div class="copyright-footer">Copyright © 2014 Peter Dimov<br>Copyright © 2014 Glen Fernandes<br>Copyright © 2014 Andrey Semashev<p>
266        Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost
267        Software License, Version 1.0</a>.
268      </p>
269</div></td>
270</tr></table>
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