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ublas/doc/storage_sparse.htm
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<html>
<head>
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<title>Sparse Storage</title>
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<h1><img src="c++boost.gif" alt="c++boost.gif" align="center">Sparse Storage</h1>
<h2><a name="map_array"></a>Map Array</h2>
<h4>Description</h4>
<p>The templated class <code>map_array&lt;I, T&gt; </code>implements
a simple std::map-like associative container as a sorted array.</p>
<h4>Example</h4>
<pre>int main () {
using namespace boost::numeric::ublas;
map_array&lt;int, double&gt; a (3);
for (int i = 0; i &lt; a.size (); ++ i) {
a [i] = i;
std::cout &lt;&lt; a [i] &lt;&lt; std::endl;
}
}</pre>
<h4>Definition</h4>
<p>Defined in the header storage_sparse.hpp.</p>
<h4>Template parameters</h4>
<table border="1">
<tr>
<th>Parameter </th>
<th>Description </th>
<th>Default </th>
</tr>
<tr>
<td><code>I</code></td>
<td>The type of index stored in the array.</td>
<td>&nbsp;</td>
</tr>
<tr>
<td><code>T</code> </td>
<td>The type of object stored in the array. </td>
<td>&nbsp;</td>
</tr>
</table>
<h4>Model of</h4>
<p>Reversible Container. </p>
<h4>Type requirements</h4>
<p>None, except for those imposed by the requirements of
Reversible Container.</p>
<h4>Public base classes</h4>
<p>None. </p>
<h4>Members</h4>
<table border="1">
<tr>
<th>Member </th>
<th>Description </th>
</tr>
<tr>
<td><code>map_array ()</code> </td>
<td>Allocates a <code>map_array </code>that holds
at most zero elements.</td>
</tr>
<tr>
<td><code>map_array (size_type size)</code></td>
<td>Allocates a <code>map_array </code>that holds
at most <code>size</code> elements.</td>
</tr>
<tr>
<td><code>map_array (const map_array
&amp;a)</code></td>
<td>The copy constructor.</td>
</tr>
<tr>
<td><code>~map_array ()</code></td>
<td>Deallocates the <code>map_array </code>itself.
</td>
</tr>
<tr>
<td><code>void resize (size_type size)</code></td>
<td>Reallocates a <code>map_array </code>to hold
at most <code>size</code> elements. The content of the <code>map_array
</code>is preserved.</td>
</tr>
<tr>
<td><code>size_type size () const</code></td>
<td>Returns the size of the <code>map_array</code>.
</td>
</tr>
<tr>
<td><code>data_reference operator [] (index_type i)</code></td>
<td>Returns a reference of the element that is associated
with a particular index. If the <code>map_array</code>
does not already contain such an element, <code>operator[]</code>
inserts the default<code> T ()</code>.</td>
</tr>
<tr>
<td><code>map_array &amp;operator = (const
map_array &amp;a)</code></td>
<td>The assignment operator.</td>
</tr>
<tr>
<td><code>map_array &amp;assign_temporary
(map_array &amp;a)</code></td>
<td>Assigns a temporary. May change the array <code>a</code>.</td>
</tr>
<tr>
<td><code>void swap (map_array &amp;a)</code></td>
<td>Swaps the contents of the arrays. </td>
</tr>
<tr>
<td><code>pointer insert (pointer it, const
value_type &amp;p)</code></td>
<td>Inserts <code>p</code> into the array, using <code>it</code>
as a hint to where it will be inserted. </td>
</tr>
<tr>
<td><code>void erase (pointer it)</code></td>
<td>Erases the value at <code>it</code>.</td>
</tr>
<tr>
<td><code>void clear ()</code></td>
<td>Clears the array. </td>
</tr>
<tr>
<td><code>const_pointer find (index_type i) const</code></td>
<td>Finds an element whose index is <code>i</code>. </td>
</tr>
<tr>
<td><code>pointer find (index_type i)</code></td>
<td>Finds an element whose index is <code>i</code>. </td>
</tr>
<tr>
<td><code>const_pointer lower_bound (index_type i)
const</code></td>
<td>Finds the first element whose index is not less than <code>i</code>.</td>
</tr>
<tr>
<td><code>pointer lower_bound (index_type i)</code></td>
<td>Finds the first element whose index is not less than <code>i</code>.
</td>
</tr>
<tr>
<td><code>const_pointer upper_bound (index_type i)
const</code></td>
<td>Finds the first element whose index is greater than <code>i</code>.
</td>
</tr>
<tr>
<td><code>pointer upper_bound (index_type i)</code></td>
<td>Finds the first element whose index is greater than <code>i</code>.
</td>
</tr>
<tr>
<td><code>const_iterator begin () const</code></td>
<td>Returns a <code>const_iterator</code> pointing to the
beginning of the <code>map_array</code>. </td>
</tr>
<tr>
<td><code>const_iterator end () const</code></td>
<td>Returns a <code>const_iterator</code> pointing to the
end of the <code>map_array</code>. </td>
</tr>
<tr>
<td><code>iterator begin () </code></td>
<td>Returns a <code>iterator</code> pointing to the
beginning of the <code>map_array</code>. </td>
</tr>
<tr>
<td><code>iterator end () </code></td>
<td>Returns a <code>iterator</code> pointing to the end
of the <code>map_array</code>. </td>
</tr>
<tr>
<td><code>const_reverse_iterator rbegin () const</code></td>
<td>Returns a <code>const_reverse_iterator</code>
pointing to the beginning of the reversed <code>map_array</code>.
</td>
</tr>
<tr>
<td><code>const_reverse_iterator rend () const</code></td>
<td>Returns a <code>const_reverse_iterator</code>
pointing to the end of the reversed <code>map_array</code>.
</td>
</tr>
<tr>
<td><code>reverse_iterator rbegin () </code></td>
<td>Returns a <code>reverse_iterator</code> pointing to
the beginning of the reversed <code>map_array</code>.
</td>
</tr>
<tr>
<td><code>reverse_iterator rend () </code></td>
<td>Returns a <code>reverse_iterator</code> pointing to
the end of the reversed <code>map_array</code>. </td>
</tr>
</table>
<h4>Interface</h4>
<pre><code> // Map array
template&lt;class I, class T&gt;
class map_array {
public:
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef I index_type;
typedef T data_value_type;
typedef const T &amp;data_const_reference;
typedef T &amp;data_reference;
typedef std::pair&lt;I, T&gt; value_type;
typedef const std::pair&lt;I, T&gt; &amp;const_reference;
typedef std::pair&lt;I, T&gt; &amp;reference;
typedef const std::pair&lt;I, T&gt; *const_pointer;
typedef std::pair&lt;I, T&gt; *pointer;
// Construction and destruction
map_array ();
map_array (size_type size);
map_array (const map_array &amp;a);
~map_array ();
// Resizing
void resize (size_type size);
size_type size () const;
// Element access
data_reference operator [] (index_type i);
// Assignment
map_array &amp;operator = (const map_array &amp;a);
map_array &amp;assign_temporary (map_array &amp;a);
// Swapping
void swap (map_array &amp;a);
friend void swap (map_array &amp;a1, map_array &amp;a2);
// Element insertion and deletion
pointer insert (pointer it, const value_type &amp;p);
void insert (pointer it, pointer it1, pointer it2);
void erase (pointer it);
void erase (pointer it1, pointer it2);
void clear ();
// Element lookup
const_pointer find (index_type i) const;
pointer find (index_type i);
const_pointer lower_bound (index_type i) const;
pointer lower_bound (index_type i);
const_pointer upper_bound (index_type i) const;
pointer upper_bound (index_type i);
// Iterators simply are pointers.
typedef const_pointer const_iterator;
const_iterator begin () const;
const_iterator end () const;
typedef pointer iterator;
iterator begin ();
iterator end ();
// Reverse iterators
typedef std::reverse_iterator&lt;const_iterator&gt; const_reverse_iterator;
const_reverse_iterator rbegin () const;
const_reverse_iterator rend () const;
typedef std::reverse_iterator&lt;iterator&gt; reverse_iterator;
reverse_iterator rbegin ();
reverse_iterator rend ();
};
template&lt;class I, class T&gt;
map_array&lt;I, T&gt; &amp;assign_temporary (map_array&lt;I, T&gt; &amp;a1, map_array&lt;I, T&gt; &amp;a2);</code></pre>
<hr>
<p>Copyright (©) 2000-2002 Joerg Walter, Mathias Koch <br>
Permission to copy, use, modify, sell and distribute this document is granted
provided this copyright notice appears in all copies. This document is provided
``as is'' without express or implied warranty, and with no claim as to its suitability
for any purpose.</p>
<p>Last revised: 8/3/2002</p>
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