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- <h1><img src="../../../../boost.png" alt="Boost logo" align=
- "middle" width="277" height="86">Boost.Flyweight
- Factories reference</h1>
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- <hr>
- <h2>Contents</h2>
- <ul>
- <li><a href="#factory">Factories and factory specifiers</a></li>
- <li><a href="#factory_tag_synopsis">Header
- <code>"boost/flyweight/factory_tag.hpp"</code> synopsis</a>
- <ul>
- <li><a href="#is_factory">Class template <code>is_factory</code></a></li>
- <li><a href="#factory_construct">Class template <code>factory</code></a></li>
- </ul>
- </li>
- <li><a href="#hashed_factory_fwd_synopsis">Header
- <code>"boost/flyweight/hashed_factory_fwd.hpp"</code> synopsis</a>
- </li>
- <li><a href="#hashed_factory_synopsis">Header
- <code>"boost/flyweight/hashed_factory.hpp"</code> synopsis</a>
- <ul>
- <li><a href="#hashed_factory_class">Class template <code>hashed_factory_class</code></a></li>
- <li><a href="#hashed_factory">Class template <code>hashed_factory</code></a></li>
- </ul>
- </li>
- <li><a href="#set_factory_fwd_synopsis">Header
- <code>"boost/flyweight/set_factory_fwd.hpp"</code> synopsis</a>
- </li>
- <li><a href="#set_factory_synopsis">Header
- <code>"boost/flyweight/set_factory.hpp"</code> synopsis</a>
- <ul>
- <li><a href="#set_factory_class">Class template <code>set_factory_class</code></a></li>
- <li><a href="#set_factory">Class template <code>set_factory</code></a></li>
- </ul>
- </li>
- <li><a href="#assoc_container_factory_fwd_synopsis">Header
- <code>"boost/flyweight/assoc_container_factory_fwd.hpp"</code> synopsis</a>
- </li>
- <li><a href="#assoc_container_factory_synopsis">Header
- <code>"boost/flyweight/assoc_container_factory.hpp"</code> synopsis</a>
- <ul>
- <li><a href="#assoc_container_factory_class">Class template <code>assoc_container_factory_class</code></a></li>
- <li><a href="#assoc_container_factory">Class template <code>assoc_container_factory</code></a></li>
- </ul>
- </li>
- </ul>
- <h2><a name="factory">Factories and factory specifiers</a></h2>
- <p>
- Given a type <code>Key</code> and an
- <a href="https://boost.org/sgi/stl/Assignable.html"><code>Assignable</code></a>
- type <code>Entry</code> implicitly convertible to <code>const Key&</code>, a
- <i>factory of <code>Entry</code> elements</i> (implicitly associated to
- <code>Key</code>) is a
- <a href="https://boost.org/sgi/stl/DefaultConstructible.html"><code>Default
- Constructible</code></a> entity able to store and retrieve immutable elements of
- type <code>Entry</code>. A factory is governed by an associated equivalence
- relation defined on <code>Key</code> so that no two
- <code>Entry</code> objects convertible to equivalent <code>Key</code>s
- can be stored simultaneously in the factory. Different factory types can
- use different equivalence relations.
- </p>
- <p>
- In the following table, <code>Factory</code> is a factory of elements
- of type <code>Entry</code>, <code>f</code> denotes an object of type <code>Factory</code>,
- <code>x</code> is an object of type <code>Entry</code> and <code>h</code> is a
- value of <code>Factory::handle_type</code>.
- </p>
- <p align="center">
- <table cellspacing="0">
- <caption><b>Factory requirements.</b></caption>
- <tr>
- <th align="center">expression</th>
- <th align="center">return type</th>
- <th align="center">assertion/note<br>pre/post-condition</th>
- </tr>
- <tr>
- <td><code>Factory::handle_type</code></td>
- <td>handle to elements of type <code>T</code><br>
- stored in the factory
- </td>
- <td><code>handle_type</code> is
- <a href="https://boost.org/sgi/stl/Assignable.html"><code>Assignable</code></a>
- and its copy and<br>
- assignment operations never throw an exception.
- </td>
- </tr>
- <tr class="odd_tr">
- <td><code>f.insert(x);</code></td>
- <td><code>handle_type</code></td>
- <td>Inserts a copy of <code>x</code> if there is no equivalent entry in <code>f</code>;<br>
- returns a handle to the inserted or equivalent element.
- </td>
- </tr>
- <tr>
- <td><code>f.erase(h);</code></td>
- <td><code>void</code></td>
- <td>Erases the element associated to <code>h</code>.<br>
- This operation does not throw.
- </td>
- </tr>
- <tr class="odd_tr">
- <td><code>f.entry(h);</code></td>
- <td><code>const Entry&</code></td>
- <td>Returns a reference to the element associated to <code>h</code>.<br>
- This operation does not throw.
- </td>
- </tr>
- </table>
- </p>
- <p>
- Additionally to the basic thread safety guarantee which is implicitly assumed
- for most classes including the majority of components of the
- C++ standard library, it is required that the member function <code>entry</code>
- can be invoked simultaneously from different threads, even in the presence
- of concurrent accesses to <code>insert</code> and <code>erase</code> (as long
- as the entry returned by <code>entry</code> is not the one which is being
- erased).
- </p>
- <p>
- A type <code>S</code> is said to be a <i>factory specifier</i> if:
- <ol>
- <li>One of the following conditions is satisfied:
- <ol type="a">
- <li><a href="#is_factory"><code>is_factory<S>::type</code></a> is
- <a href="../../../mpl/doc/refmanual/bool.html"><code>boost::mpl::true_</code></a>,</li>
- <li><code>S</code> is of the form <a href="#factory_construct"><code>factory<S'></code></a>.</li>
- </ol>
- </li>
- <li><code>S</code>, or <code>S'</code> if (b) applies, is an
- <a href="../../../mpl/doc/refmanual/lambda-expression.html"><code>MPL Lambda
- Expression</code></a> such that invoking it with types (<code>Entry</code>,
- <code>Key</code>) resolves to a factory type of <code>Entry</code> elements
- (implicitly associated to <code>Key</code>).
- </li>
- </ol>
- </p>
- <h2><a name="factory_tag_synopsis">Header
- <a href="../../../../boost/flyweight/factory_tag.hpp"><code>"boost/flyweight/factory_tag.hpp"</code></a> synopsis</a></h2>
- <blockquote><pre>
- <span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span>
- <span class=keyword>namespace</span> <span class=identifier>flyweights</span><span class=special>{</span>
- <span class=keyword>struct</span> <span class=identifier>factory_marker</span><span class=special>;</span>
- <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>T</span><span class=special>></span>
- <span class=keyword>struct</span> <span class=identifier>is_factory</span><span class=special>;</span>
- <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>T</span><span class=special>></span>
- <span class=keyword>struct</span> <span class=identifier>factory</span><span class=special>;</span>
- <span class=special>}</span> <span class=comment>// namespace boost::flyweights</span>
- <span class=special>}</span> <span class=comment>// namespace boost</span>
- </pre></blockquote>
- <h3><a name="is_factory">Class template <code>is_factory</code></a></h3>
- <p>
- Unless specialized by the user, <code>is_factory<T>::type</code> is
- <a href="../../../mpl/doc/refmanual/bool.html"><code>boost::mpl::true_</code></a>
- if <code>T</code> is derived from <code>factory_marker</code>, and it is
- <a href="../../../mpl/doc/refmanual/bool.html"><code>boost::mpl::false_</code></a>
- otherwise.
- </p>
- <h3><a name="factory_construct">Class template <code>factory</code></a></h3>
- <p>
- <code>factory<T></code> is a syntactic construct meant to indicate
- that <code>T</code> is a factory specifier without resorting to the
- mechanisms provided by the <code>is_factory</code> class template.
- </p>
- <h2><a name="hashed_factory_fwd_synopsis">Header
- <a href="../../../../boost/flyweight/hashed_factory_fwd.hpp"><code>"boost/flyweight/hashed_factory_fwd.hpp"</code></a> synopsis</a></h2>
- <blockquote><pre>
- <span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span>
- <span class=keyword>namespace</span> <span class=identifier>flyweights</span><span class=special>{</span>
- <span class=keyword>template</span><span class=special><</span>
- <span class=keyword>typename</span> <span class=identifier>Entry</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Key</span><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Hash</span><span class=special>=</span><b>implementation defined</b><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Pred</span><span class=special>=</span><b>implementation defined</b><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>=</span><b>implementation defined</b>
- <span class=special>></span>
- <span class=keyword>class</span> <span class=identifier>hashed_factory_class</span><span class=special>;</span>
- <span class=keyword>template</span><span class=special><</span>
- <span class=keyword>typename</span> <span class=identifier>Hash</span><span class=special>=</span><b>implementation defined</b><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Pred</span><span class=special>=</span><b>implementation defined</b><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>=</span><b>implementation defined</b>
- <span class=special>></span>
- <span class=keyword>struct</span> <span class=identifier>hashed_factory</span><span class=special>;</span>
- <span class=special>}</span> <span class=comment>// namespace boost::flyweights</span>
- <span class=special>}</span> <span class=comment>// namespace boost</span>
- </pre></blockquote>
- <p>
- <code>hashed_factory_fwd.hpp</code> forward declares the class templates
- <a href="#hashed_factory_class"><code>hashed_factory_class</code></a>
- and <a href="#hashed_factory"><code>hashed_factory</code></a>.
- </p>
- <h2><a name="hashed_factory_synopsis">Header
- <a href="../../../../boost/flyweight/hashed_factory.hpp"><code>"boost/flyweight/hashed_factory.hpp"</code></a> synopsis</a></h2>
- <h3><a name="hashed_factory_class">Class template <code>hashed_factory_class</code></a></h3>
- <p>
- <code>hashed_factory_class</code> is a <a href="#factory"><code>Factory</code></a>
- implemented with a hashed container.
- </p>
- <blockquote><pre>
- <span class=keyword>template</span><span class=special><</span>
- <span class=keyword>typename</span> <span class=identifier>Entry</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Key</span><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Hash</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Pred</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Allocator</span>
- <span class=special>></span>
- <span class=keyword>class</span> <span class=identifier>hashed_factory_class</span>
- <span class=special>{</span>
- <span class=keyword>public</span><span class=special>:</span>
- <span class=keyword>typedef</span> <b>implementation defined</b> <span class=identifier>handle_type</span><span class=special>;</span>
-
- <span class=identifier>handle_type</span> <span class=identifier>insert</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>Entry</span><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span>
- <span class=keyword>void</span> <span class=identifier>erase</span><span class=special>(</span><span class=identifier>handle_type</span> <span class=identifier>h</span><span class=special>);</span>
- <span class=keyword>const</span> <span class=identifier>Entry</span><span class=special>&</span> <span class=identifier>entry</span><span class=special>(</span><span class=identifier>handle_type</span> <span class=identifier>h</span><span class=special>);</span>
- <span class=special>};</span>
- </pre></blockquote>
- <p>
- <code>Hash</code> is a
- <a href="https://boost.org/sgi/stl/DefaultConstructible.html"><code>Default
- Constructible</code></a>
- <a href="https://boost.org/sgi/stl/UnaryFunction.html"><code>Unary Function</code></a>
- taking a single argument of type <code>Key</code> and returning a
- value of type <code>std::size_t</code> in the range
- <code>[0, std::numeric_limits<std::size_t>::max())</code>.
- <code>Pred</code> is a
- <a href="https://boost.org/sgi/stl/DefaultConstructible.html"><code>Default
- Constructible</code></a>
- <a href="https://boost.org/sgi/stl/BinaryPredicate.html">
- <code>Binary Predicate</code></a> inducing an equivalence relation
- on elements of <code>Key</code>. It is required that
- a <code>Hash</code> object return the same value for objects
- equivalent under <code>Pred</code>.
- The equivalence relation on <code>Key</code> associated to the factory is
- that induced by <code>Pred</code>.
- The default arguments for <code>Hash</code> and <code>Pred</code> are
- <a href="../../../functional/hash/index.html"><code>boost::hash<Key></code></a>
- and <code>std::equal_to<Key></code>, respectively.
- <code>Allocator</code> must be an allocator of <code>Entry</code> objects
- satisfying the associated C++ requirements at <b>[lib.allocator.requirements]</b>.
- The default argument is <code>std::allocator<Entry></code>. The internal
- hashed container upon which <code>hashed_factory_class</code> is based is
- constructed with default initialized objects of type <code>Hash</code>,
- <code>Pred</code> and <code>Allocator</code>.
- </p>
- <h3><a name="hashed_factory">Class template <code>hashed_factory</code></a></h3>
- <p>
- <a href="#factory"><code>Factory Specifier</code></a> for <a href="#hashed_factory_class"><code>hashed_factory_class</code></a>.
- </p>
- <blockquote><pre>
- <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>Hash</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Pred</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>></span>
- <span class=keyword>struct</span> <span class=identifier>hashed_factory</span><span class=special>;</span>
- </pre></blockquote>
- <p>
- <code>hashed_factory<Hash,Pred,Allocator></code> is an
- <a href="../../../mpl/doc/refmanual/metafunction-class.html"><code>MPL Metafunction
- Class</code></a> such that the type
- </p>
- <blockquote><pre>
- <span class=identifier>boost</span><span class=special>::</span><span class=identifier>mpl</span><span class=special>::</span><span class=identifier>apply</span><span class=special><</span>
- <span class=identifier>hashed_factory</span><span class=special><</span><span class=identifier>Hash</span><span class=special>,</span><span class=identifier>Pred</span><span class=special>,</span><span class=identifier>Allocator</span><span class=special>>,</span>
- <span class=identifier>Entry</span><span class=special>,</span><span class=identifier>Key</span>
- <span class=special>>::</span><span class=identifier>type</span>
- </pre></blockquote>
- <p>
- is the same as
- </p>
- <blockquote><pre>
- <span class=identifier>boost</span><span class=special>::</span><span class=identifier>mpl</span><span class=special>::</span><span class=identifier>apply</span><span class=special><</span>
- <span class=identifier>hashed_factory_class</span><span class=special><</span><span class=identifier>boost</span><span class=special>::</span><span class=identifier>mpl</span><span class=special>::</span><span class=identifier>_1</span><span class=special>,</span><span class=identifier>boost</span><span class=special>::</span><span class=identifier>mpl</span><span class=special>::</span><span class=identifier>_2</span><span class=special>,</span><span class=identifier>Hash</span><span class=special>,</span><span class=identifier>Pred</span><span class=special>,</span><span class=identifier>Allocator</span><span class=special>>,</span>
- <span class=identifier>Entry</span><span class=special>,</span><span class=identifier>Key</span>
- <span class=special>>::</span><span class=identifier>type</span>
- </pre></blockquote>
- <p>
- This implies that <code>Hash</code>, <code>Pred</code> and <code>Allocator</code>
- can be
- <a href="../../../mpl/doc/refmanual/placeholder-expression.html"><code>MPL
- Placeholder Expressions</code></a> resolving to the actual types used by
- <code>hashed_factory_class</code>.
- </p>
- <h2><a name="set_factory_fwd_synopsis">Header
- <a href="../../../../boost/flyweight/set_factory_fwd.hpp"><code>"boost/flyweight/set_factory_fwd.hpp"</code></a> synopsis</a></h2>
- <blockquote><pre>
- <span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span>
- <span class=keyword>namespace</span> <span class=identifier>flyweights</span><span class=special>{</span>
- <span class=keyword>template</span><span class=special><</span>
- <span class=keyword>typename</span> <span class=identifier>Entry</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Key</span><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>=</span><b>implementation defined</b><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>=</span><b>implementation defined</b>
- <span class=special>></span>
- <span class=keyword>class</span> <span class=identifier>set_factory_class</span><span class=special>;</span>
- <span class=keyword>template</span><span class=special><</span>
- <span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>=</span><b>implementation defined</b><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>=</span><b>implementation defined</b>
- <span class=special>></span>
- <span class=keyword>struct</span> <span class=identifier>set_factory</span><span class=special>;</span>
- <span class=special>}</span> <span class=comment>// namespace boost::flyweights</span>
- <span class=special>}</span> <span class=comment>// namespace boost</span>
- </pre></blockquote>
- <p>
- <code>set_factory_fwd.hpp</code> forward declares the class templates
- <a href="#set_factory_class"><code>set_factory_class</code></a>
- and <a href="#set_factory"><code>set_factory</code></a>.
- </p>
- <h2><a name="set_factory_synopsis">Header
- <a href="../../../../boost/flyweight/set_factory.hpp"><code>"boost/flyweight/set_factory.hpp"</code></a> synopsis</a></h2>
- <h3><a name="set_factory_class">Class template <code>set_factory_class</code></a></h3>
- <p>
- <code>set_factory_class</code> is a <a href="#factory"><code>Factory</code></a>
- implemented on top of an orderded associative container.
- </p>
- <blockquote><pre>
- <span class=keyword>template</span><span class=special><</span>
- <span class=keyword>typename</span> <span class=identifier>Entry</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Key</span><span class=special>,</span>
- <span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Allocator</span>
- <span class=special>></span>
- <span class=keyword>class</span> <span class=identifier>set_factory_class</span>
- <span class=special>{</span>
- <span class=keyword>public</span><span class=special>:</span>
- <span class=keyword>typedef</span> <b>implementation defined</b> <span class=identifier>handle_type</span><span class=special>;</span>
-
- <span class=identifier>handle_type</span> <span class=identifier>insert</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>Entry</span><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span>
- <span class=keyword>void</span> <span class=identifier>erase</span><span class=special>(</span><span class=identifier>handle_type</span> <span class=identifier>h</span><span class=special>);</span>
- <span class=keyword>const</span> <span class=identifier>Entry</span><span class=special>&</span> <span class=identifier>entry</span><span class=special>(</span><span class=identifier>handle_type</span> <span class=identifier>h</span><span class=special>);</span>
- <span class=special>};</span>
- </pre></blockquote>
- <p>
- <code>Compare</code> is a
- <a href="https://boost.org/sgi/stl/DefaultConstructible.html"><code>Default
- Constructible</code></a>
- <a href="https://boost.org/sgi/stl/StrictWeakOrdering.html">
- <code>Strict Weak Ordering</code></a> on <code>Key</code>. Two <code>Key</code>s
- <code>x</code> and <code>y</code> are considered equivalent if
- <code>!c(x,y)&&!c(y,x)</code> for <code>c</code> of type <code>Compare</code>.
- The default argument of <code>Compare</code> is <code>std::less<Key></code>.
- <code>Allocator</code> must be an allocator of <code>Entry</code> objects
- satisfying the associated C++ requirements at <b>[lib.allocator.requirements]</b>.
- The default argument is <code>std::allocator<Entry></code>. The internal
- container upon which <code>set_factory_class</code> is based is
- constructed with default initialized objects of type <code>Compare</code>
- and <code>Allocator</code>.
- </p>
- <h3><a name="set_factory">Class template <code>set_factory</code></a></h3>
- <p>
- <a href="#factory"><code>Factory Specifier</code></a> for <a href="#set_factory_class"><code>set_factory_class</code></a>.
- </p>
- <blockquote><pre>
- <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>></span>
- <span class=keyword>struct</span> <span class=identifier>set_factory</span><span class=special>;</span>
- </pre></blockquote>
- <p>
- <code>set_factory<Compare,Allocator></code> is an
- <a href="../../../mpl/doc/refmanual/metafunction-class.html"><code>MPL Metafunction
- Class</code></a> such that the type
- </p>
- <blockquote><pre>
- <span class=identifier>boost</span><span class=special>::</span><span class=identifier>mpl</span><span class=special>::</span><span class=identifier>apply</span><span class=special><</span>
- <span class=identifier>set_factory</span><span class=special><</span><span class=identifier>Compare</span><span class=special>,</span><span class=identifier>Allocator</span><span class=special>>,</span>
- <span class=identifier>Entry</span><span class=special>,</span><span class=identifier>Key</span>
- <span class=special>>::</span><span class=identifier>type</span>
- </pre></blockquote>
- <p>
- is the same as
- </p>
- <blockquote><pre>
- <span class=identifier>boost</span><span class=special>::</span><span class=identifier>mpl</span><span class=special>::</span><span class=identifier>apply</span><span class=special><</span>
- <span class=identifier>set_factory_class</span><span class=special><</span><span class=identifier>boost</span><span class=special>::</span><span class=identifier>mpl</span><span class=special>::</span><span class=identifier>_1</span><span class=special>,</span><span class=identifier>boost</span><span class=special>::</span><span class=identifier>mpl</span><span class=special>::</span><span class=identifier>_2</span><span class=special>,</span><span class=identifier>Compare</span><span class=special>,</span><span class=identifier>Allocator</span><span class=special>>,</span>
- <span class=identifier>Entry</span><span class=special>,</span><span class=identifier>Key</span>
- <span class=special>>::</span><span class=identifier>type</span>
- </pre></blockquote>
- <p>
- This implies that <code>Compare</code> and <code>Allocator</code>
- can be
- <a href="../../../mpl/doc/refmanual/placeholder-expression.html"><code>MPL
- Placeholder Expressions</code></a> resolving to the actual types used by
- <code>set_factory_class</code>.
- </p>
- <h2><a name="assoc_container_factory_fwd_synopsis">Header
- <a href="../../../../boost/flyweight/assoc_container_factory_fwd.hpp"><code>"boost/flyweight/assoc_container_factory_fwd.hpp"</code></a> synopsis</a></h2>
- <blockquote><pre>
- <span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span>
- <span class=keyword>namespace</span> <span class=identifier>flyweights</span><span class=special>{</span>
- <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>Container</span><span class=special>></span>
- <span class=keyword>class</span> <span class=identifier>assoc_container_factory_class</span><span class=special>;</span>
- <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>ContainerSpecifier</span><span class=special>></span>
- <span class=keyword>struct</span> <span class=identifier>assoc_container_factory</span><span class=special>;</span>
- <span class=special>}</span> <span class=comment>// namespace boost::flyweights</span>
- <span class=special>}</span> <span class=comment>// namespace boost</span>
- </pre></blockquote>
- <p>
- <code>assoc_container_factory_fwd.hpp</code> forward declares the class templates
- <a href="#assoc_container_factory_class"><code>assoc_container_factory_class</code></a>
- and <a href="#assoc_container_factory"><code>assoc_container_factory</code></a>.
- </p>
- <h2><a name="assoc_container_factory_synopsis">Header
- <a href="../../../../boost/flyweight/assoc_container_factory.hpp"><code>"boost/flyweight/assoc_container_factory.hpp"</code></a> synopsis</a></h2>
- <h3><a name="assoc_container_factory_class">Class template <code>assoc_container_factory_class</code></a></h3>
- <p>
- <code>assoc_container_factory_class</code> wraps a suitable associative container
- to provide a <a href="#factory"><code>Factory</code></a> interface.
- </p>
- <blockquote><pre>
- <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>Container</span><span class=special>></span>
- <span class=keyword>class</span> <span class=identifier>assoc_container_factory_class</span>
- <span class=special>{</span>
- <span class=keyword>public</span><span class=special>:</span>
- <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>Container</span><span class=special>::</span><span class=identifier>iterator</span> <span class=identifier>handle_type</span><span class=special>;</span>
-
- <span class=identifier>handle_type</span> <span class=identifier>insert</span><span class=special>(</span><span class=keyword>const</span> <span class=keyword>typename</span> <span class=identifier>Container</span><span class=special>::</span><span class=identifier>value_type</span><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span>
- <span class=keyword>void</span> <span class=identifier>erase</span><span class=special>(</span><span class=identifier>handle_type</span> <span class=identifier>h</span><span class=special>);</span>
- <span class=keyword>const</span> <span class=keyword>typename</span> <span class=identifier>Container</span><span class=special>::</span><span class=identifier>value_type</span><span class=special>&</span> <span class=identifier>entry</span><span class=special>(</span><span class=identifier>handle_type</span> <span class=identifier>h</span><span class=special>);</span>
- <span class=special>};</span>
- </pre></blockquote>
- <p>
- <code>Container</code> must be an (ordered or unordered) associative container
- such that
- <ol>
- <li><code>Container::key_type</code> is the same as
- <code>Container::value_type</code> (which is the entry type associated to
- the factory).
- </li>
- <li>Unique keys (rather than equivalent keys) are supported.</li>
- <li><code>Container</code> is <i>stable</i>, i.e. its iterators are not
- invalidated upon insert or erase operations.</li>
- </ol>
- The equivalence relation associated to <code>assoc_container_factory_class</code>
- is the one induced by <code>Container</code>. If equivalence of elements
- of <code>Container::value_type</code> is determined solely on the basis of a
- type <code>value_type'</code> to which <code>value_type</code> is
- implicitly convertible, then <code>assoc_container_factory_class</code> is
- a factory of entries of type <code>value_type</code> implicitly associated to
- <code>value_type'</code>. For example, the instantiation
- </p>
- <blockquote><pre>
- <span class=identifier>assoc_container_factory_class</span><span class=special><</span>
- <span class=identifier>std</span><span class=special>::</span><span class=identifier>set</span><span class=special><</span><span class=identifier>derived</span><span class=special>,</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>less</span><span class=special><</span><span class=identifier>base</span><span class=special>></span> <span class=special>></span> <span class=comment>// derived inherits from base</span>
- <span class=special>></span>
- </pre></blockquote>
- <p>
- is a factory of <code>derived</code> elements implicitly associated to
- <code>base</code>.
- </p>
- <h3><a name="assoc_container_factory">Class template <code>assoc_container_factory</code></a></h3>
- <p>
- <a href="#factory"><code>Factory Specifier</code></a> for <a href="#assoc_container_factory_class"><code>assoc_container_factory_class</code></a>.
- </p>
- <blockquote><pre>
- <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>ContainerSpecifier</span><span class=special>></span>
- <span class=keyword>struct</span> <span class=identifier>assoc_container_factory</span><span class=special>;</span>
- </pre></blockquote>
- <p>
- <code>ContainerSpecifier</code> must be an
- <a href="../../../mpl/doc/refmanual/lambda-expression.html"><code>MPL Lambda
- Expression</code></a> resolving, when invoked with (<code>Entry</code>,
- <code>Key</code>), to a type <code>Container</code> such that
- <code>assoc_container_factory_class<Container></code> is a factory
- of <code>Entry</code> elements implicitly associated to <code>Key</code>.
- </p>
- <hr>
- <div class="prev_link"><a href="tags.html"><img src="../prev.gif" alt="tags" border="0"><br>
- Tags
- </a></div>
- <div class="up_link"><a href="index.html"><img src="../up.gif" alt="Boost.Flyweight reference" border="0"><br>
- Boost.Flyweight reference
- </a></div>
- <div class="next_link"><a href="holders.html"><img src="../next.gif" alt="holders" border="0"><br>
- Holders
- </a></div><br clear="all" style="clear: all;">
- <br>
- <p>Revised April 24th 2019</p>
- <p>© Copyright 2006-2019 Joaquín M López Muñoz.
- Distributed under the Boost Software
- License, Version 1.0. (See accompanying file <a href="../../../../LICENSE_1_0.txt">
- LICENSE_1_0.txt</a> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">
- http://www.boost.org/LICENSE_1_0.txt</a>)
- </p>
- </body>
- </html>
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