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HTML
158 lines
5.6 KiB
HTML
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<title>Storage concept</title>
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</head>
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<body>
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<h1><img src="../../../../boost.png" align="middle" />Storage concept</h1>
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<div class="toc" id="toc"></div>
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<h2><a name="range"></a>Storage concept</h2>
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<h4>Description</h4>
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<p>Storage is a variable-size container whose elements are arranged in a strict linear order.
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<p>Storage extends the STL Container concept with some STL Sequence-like functionality. The main difference with
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the Sequence concept however is that the Storage concept does not require default-initialisation of its
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elements.
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<h4>Refinement of</h4>
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<a href="http://www.sgi.com/tech/stl/RandomAccessContainer.html">Random Access Container</a>
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and
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<a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</a>
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<h4>Associated types</h4>
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No additional types beyond those defined by
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<a href="http://www.sgi.com/tech/stl/RandomAccessContainer.html">Random Access Container</a>
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<h4>Notation</h4>
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<table summary="storage types">
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<tr><td><tt>X</tt></td><td>A type that is model of Storage</td></tr>
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<tr><td><tt>T</tt></td><td>The value_type of <tt>X</tt></td></tr>
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<tr><td><tt>t</tt></td><td>An object of type <tt>T</tt></td></tr>
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<tr><td><tt>n</tt></td><td>object of type convertible to <tt>X::size_type</tt></td></tr>
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</table>
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<h4>Definitions</h4>
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<h4>Valid expressions</h4>
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In addition to the expressions defined in
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<a href="http://www.sgi.com/tech/stl/RandomAccessContainer.html">Random Access Container</a>,
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and
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<a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</a>
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the following expressions must be valid:
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<table border="1" summary="type requirements">
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<TR><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH><TH>Return type</TH></TR>
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<TR>
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<td>Size constructor</td>
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<td><tt>X(n)</tt></td>
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<td>T is <a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">DefaultConstructible</a></td>
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<td><tt>X</tt></td>
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</TR>
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<TR>
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<td>Fill constructor</td>
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<td><tt>X(n,t)</tt></td>
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<td></td>
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<td><tt>X</tt></td>
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</TR>
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<TR>
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<TD>Range constructor</TD>
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<TD><tt>X(i, j)</tt></TD>
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<TD><tt>i</tt> and <tt>j</tt> are <A href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterators</A> whose value type is convertible to <tt>T</tt> </TD>
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<TD><tt>X</tt> </TD>
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</TR>
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<TR>
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<TD>Resize</TD>
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<TD><tt>a.resize(n, t)</tt></TD>
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<TD><tt>a</tt> is mutable</TD>
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<TD><tt>void</tt></TD>
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</TR>
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<TR>
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<TD>Resize</TD>
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<TD><tt>a.resize(n)</tt></TD>
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<TD><tt>a</tt> is mutable</TD>
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<TD><tt>void</tt></TD>
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</tr>
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</table>
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<h3>Expression semantics</h3>
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<table border="1" summary="expresisons">
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<tr><th>Name<th>Expression<th>Precondition<th>Semantics<th>Postcondition
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<tr>
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<td>Default-constructor</td>
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<td><tt>X()</tt>
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<td></td>
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<td>Creates 0 elements.
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</td>
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<td><tt>size()==0</tt></td>
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</tr>
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<tr>
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<td>Size-constructor</td>
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<td><tt>X(n)</tt>
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<td><tt>n>=0</tt></td>
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<td>Creates n elements. Elements are constructed without an initializer. That is
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if T is a (possibly cv-qualified) non-POD class type (or array thereof), the object is default
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initialized. Otherwise, the object created has indeterminate value. See the sentance
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"If new initializer is omitted" in section 5.3.4 paragraph 15 of the ISO C++ standard.
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</td>
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<td><tt>size()==n</tt></td>
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</tr>
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<tr>
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<td>Fill-constructor</td>
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<td><tt>X(n,t)</tt>
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<td><tt>n>=0</tt></td>
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<td>Creates n initialised element with copies of <code>t</code></td>
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<td><tt>size()==n</tt></td>
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</tr>
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<TR>
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<TD>Range constructor</TD>
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<TD><tt>X(i, j)</tt></TD>
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<TD><tt>[i,j)</tt> is a valid range.</TD>
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<TD>copies the range <tt>[i,j) to the storage</tt></TD>
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<TD><tt>size()</tt> is equal to the distance from <tt>i</tt> to <tt>j</tt>. Each element is a copy of the corresponding element in the range <tt>[i,j)</tt>.</TD>
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</TR>
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<TR>
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<TD>Resize</TD>
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<TD><tt>a.resize(n, t)</tt></TD>
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<TD><tt>n <= a.max_size()</tt></TD>
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<td>Modified the container so that it has exactly <tt>n</tt> elements.<br />
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The container may be reallocated if its size changes.
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Existing element values are preserved, additional elements are copies of <code>t</code>.</td>
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<TD><tt>a.size() == n</tt></TD>
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</TR>
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<TR>
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<TD>Resize</TD>
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<TD><tt>a.resize(n)</tt></TD>
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<TD><tt>n <= a.max_size()</tt></TD>
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<TD>Modified the container so that it has exactly <tt>n</tt> elements.<br />
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The container may be reallocated if its size changes. Element values are uninitialised. That is,
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each element value may be a previously assigned value or default construced value for <code>T</code>.</TD>
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<TD><tt>a.size() == n</tt></TD>
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</tr>
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</table>
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<h4>Complexity guarantees</h4>
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<h4>Invariants</h4>
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<h4>Models</h4>
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<ul>
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<li><a href="unbounded_array.html">unbounded_array</a>
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<li><a href="bounded_array.html">bounded_array</a>
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</ul>
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<h4>Notes</h4>
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<hr />
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<p>Copyright (©) 2000-2002 Joerg Walter, Mathias Koch<br />
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Use, modification and distribution are subject to the
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Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt
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or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">
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http://www.boost.org/LICENSE_1_0.txt
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</a>).
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</p>
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