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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
| commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
| tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/boost/libs/utility/Collection.html | |
| parent | Initial commit. (diff) | |
| download | ceph-upstream.tar.xz ceph-upstream.zip | |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/boost/libs/utility/Collection.html')
| -rw-r--r-- | src/boost/libs/utility/Collection.html | 534 |
1 files changed, 534 insertions, 0 deletions
diff --git a/src/boost/libs/utility/Collection.html b/src/boost/libs/utility/Collection.html new file mode 100644 index 000000000..b92ddd6ee --- /dev/null +++ b/src/boost/libs/utility/Collection.html @@ -0,0 +1,534 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> + +<html> +<head> + <meta http-equiv="Content-Language" content="en-us"> + <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> + + <title>Collection</title> +</head> + +<body bgcolor="#FFFFFF" link="#0000EE" text="#000000" vlink="#551A8B" alink= +"#FF0000"> + <h1><img src="../../boost.png" alt="boost logo" width="277" align="middle" + height="86"><br> + Collection</h1> + + <h3>Description</h3> + + <p>A Collection is a <i>concept</i> similar to the STL <a href= + "http://www.sgi.com/tech/stl/Container.html">Container</a> concept. A + Collection provides iterators for accessing a range of elements and + provides information about the number of elements in the Collection. + However, a Collection has fewer requirements than a Container. The + motivation for the Collection concept is that there are many useful + Container-like types that do not meet the full requirements of Container, + and many algorithms that can be written with this reduced set of + requirements. To summarize the reduction in requirements:</p> + + <ul> + <li>It is not required to "own" its elements: the lifetime of an element + in a Collection does not have to match the lifetime of the Collection + object, though the lifetime of the element should cover the lifetime of + the Collection object.</li> + + <li>The semantics of copying a Collection object is not defined (it could + be a deep or shallow copy or not even support copying).</li> + + <li>The associated reference type of a Collection does not have to be a + real C++ reference.</li> + </ul>Because of the reduced requirements, some care must be taken when + writing code that is meant to be generic for all Collection types. In + particular, a Collection object should be passed by-reference since + assumptions can not be made about the behaviour of the copy constructor. + + <h3>Associated types</h3> + + <table border summary=""> + <tr> + <td valign="top">Value type</td> + + <td valign="top"><tt>X::value_type</tt></td> + + <td valign="top">The type of the object stored in a Collection. If the + Collection is <i>mutable</i> then the value type must be <a href= + "http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>. Otherwise + the value type must be <a href= + "./CopyConstructible.html">CopyConstructible</a>.</td> + </tr> + + <tr> + <td valign="top">Iterator type</td> + + <td valign="top"><tt>X::iterator</tt></td> + + <td valign="top">The type of iterator used to iterate through a + Collection's elements. The iterator's value type is expected to be the + Collection's value type. A conversion from the iterator type to the + const iterator type must exist. The iterator type must be an <a href= + "http://www.sgi.com/tech/stl/InputIterator.html">InputIterator</a>.</td> + </tr> + + <tr> + <td valign="top">Const iterator type</td> + + <td valign="top"><tt>X::const_iterator</tt></td> + + <td valign="top">A type of iterator that may be used to examine, but + not to modify, a Collection's elements.</td> + </tr> + + <tr> + <td valign="top">Reference type</td> + + <td valign="top"><tt>X::reference</tt></td> + + <td valign="top">A type that behaves like a reference to the + Collection's value type. <a href="#n1">[1]</a></td> + </tr> + + <tr> + <td valign="top">Const reference type</td> + + <td valign="top"><tt>X::const_reference</tt></td> + + <td valign="top">A type that behaves like a const reference to the + Collection's value type.</td> + </tr> + + <tr> + <td valign="top">Pointer type</td> + + <td valign="top"><tt>X::pointer</tt></td> + + <td valign="top">A type that behaves as a pointer to the Collection's + value type.</td> + </tr> + + <tr> + <td valign="top">Distance type</td> + + <td valign="top"><tt>X::difference_type</tt></td> + + <td valign="top">A signed integral type used to represent the distance + between two of the Collection's iterators. This type must be the same + as the iterator's distance type.</td> + </tr> + + <tr> + <td valign="top">Size type</td> + + <td valign="top"><tt>X::size_type</tt></td> + + <td valign="top">An unsigned integral type that can represent any + nonnegative value of the Collection's distance type.</td> + </tr> + </table> + + <h3>Notation</h3> + + <table summary=""> + <tr> + <td valign="top"><tt>X</tt></td> + + <td valign="top">A type that is a model of Collection.</td> + </tr> + + <tr> + <td valign="top"><tt>a</tt>, <tt>b</tt></td> + + <td valign="top">Object of type <tt>X</tt>.</td> + </tr> + + <tr> + <td valign="top"><tt>T</tt></td> + + <td valign="top">The value type of <tt>X</tt>.</td> + </tr> + </table> + + <h3>Valid expressions</h3> + + <p>The following expressions must be valid.</p> + + <table border summary=""> + <tr> + <th>Name</th> + + <th>Expression</th> + + <th>Return type</th> + </tr> + + <tr> + <td valign="top">Beginning of range</td> + + <td valign="top"><tt>a.begin()</tt></td> + + <td valign="top"><tt>iterator</tt> if <tt>a</tt> is mutable, + <tt>const_iterator</tt> otherwise</td> + </tr> + + <tr> + <td valign="top">End of range</td> + + <td valign="top"><tt>a.end()</tt></td> + + <td valign="top"><tt>iterator</tt> if <tt>a</tt> is mutable, + <tt>const_iterator</tt> otherwise</td> + </tr> + + <tr> + <td valign="top">Size</td> + + <td valign="top"><tt>a.size()</tt></td> + + <td valign="top"><tt>size_type</tt></td> + </tr><!-- +<TR> +<TD VAlign=top> +Maximum size +</TD> +<TD VAlign=top> +<tt>a.max_size()</tt> +</TD> +<TD VAlign=top> +<tt>size_type</tt> +</TD> +</TR> +--> + + <tr> + <td valign="top">Empty Collection</td> + + <td valign="top"><tt>a.empty()</tt></td> + + <td valign="top">Convertible to <tt>bool</tt></td> + </tr> + + <tr> + <td valign="top">Swap</td> + + <td valign="top"><tt>a.swap(b)</tt></td> + + <td valign="top"><tt>void</tt></td> + </tr> + </table> + + <h3>Expression semantics</h3> + + <table border summary=""> + <tr> + <th>Name</th> + + <th>Expression</th> + + <th>Semantics</th> + + <th>Postcondition</th> + </tr> + + <tr> + <td valign="top">Beginning of range</td> + + <td valign="top"><tt>a.begin()</tt></td> + + <td valign="top">Returns an iterator pointing to the first element in + the Collection.</td> + + <td valign="top"><tt>a.begin()</tt> is either dereferenceable or + past-the-end. It is past-the-end if and only if <tt>a.size() == + 0</tt>.</td> + </tr> + + <tr> + <td valign="top">End of range</td> + + <td valign="top"><tt>a.end()</tt></td> + + <td valign="top">Returns an iterator pointing one past the last element + in the Collection.</td> + + <td valign="top"><tt>a.end()</tt> is past-the-end.</td> + </tr> + + <tr> + <td valign="top">Size</td> + + <td valign="top"><tt>a.size()</tt></td> + + <td valign="top">Returns the size of the Collection, that is, its + number of elements.</td> + + <td valign="top"><tt>a.size() >= 0</tt></td> + </tr><!-- +<TR> +<TD VAlign=top> +Maximum size +</TD> +<TD VAlign=top> +<tt>a.max_size()</tt> +</TD> +<TD VAlign=top> + +</TD> +<TD VAlign=top> +Returns the largest size that this Collection can ever have. <A href="#8">[8]</A> +</TD> +<TD VAlign=top> +<tt>a.max_size() >= 0 && a.max_size() >= a.size()</tt> +</TD> +</TR> + --> + + <tr> + <td valign="top">Empty Collection</td> + + <td valign="top"><tt>a.empty()</tt></td> + + <td valign="top">Equivalent to <tt>a.size() == 0</tt>. (But possibly + faster.)</td> + + <td valign="top"> </td> + </tr> + + <tr> + <td valign="top">Swap</td> + + <td valign="top"><tt>a.swap(b)</tt></td> + + <td valign="top">Equivalent to <tt>swap(a,b)</tt></td> + + <td valign="top"> </td> + </tr> + </table> + + <h3>Complexity guarantees</h3> + + <p><tt>begin()</tt> and <tt>end()</tt> are amortized constant time.</p> + + <p><tt>size()</tt> is at most linear in the Collection's size. + <tt>empty()</tt> is amortized constant time.</p> + + <p><tt>swap()</tt> is at most linear in the size of the two + collections.</p> + + <h3>Invariants</h3> + + <table border summary=""> + <tr> + <td valign="top">Valid range</td> + + <td valign="top">For any Collection <tt>a</tt>, <tt>[a.begin(), + a.end())</tt> is a valid range.</td> + </tr> + + <tr> + <td valign="top">Range size</td> + + <td valign="top"><tt>a.size()</tt> is equal to the distance from + <tt>a.begin()</tt> to <tt>a.end()</tt>.</td> + </tr> + + <tr> + <td valign="top">Completeness</td> + + <td valign="top">An algorithm that iterates through the range + <tt>[a.begin(), a.end())</tt> will pass through every element of + <tt>a</tt>.</td> + </tr> + </table> + + <h3>Models</h3> + + <ul> + <li><tt>array</tt></li> + + <li><tt>array_ptr</tt></li> + + <li><tt>vector<bool></tt></li> + </ul> + + <h3>Collection Refinements</h3> + + <p>There are quite a few concepts that refine the Collection concept, + similar to the concepts that refine the Container concept. Here is a brief + overview of the refining concepts.</p> + + <h4>ForwardCollection</h4> + + <p>The elements are arranged in some order that does not change + spontaneously from one iteration to the next. As a result, a + ForwardCollection is <a href= + "http://www.sgi.com/tech/stl/EqualityComparable.html">EqualityComparable</a> + and <a href= + "http://www.sgi.com/tech/stl/LessThanComparable.html">LessThanComparable</a>. + In addition, the iterator type of a ForwardCollection is a + MultiPassInputIterator which is just an InputIterator with the added + requirements that the iterator can be used to make multiple passes through + a range, and that if <tt>it1 == it2</tt> and <tt>it1</tt> is + dereferenceable then <tt>++it1 == ++it2</tt>. The ForwardCollection also + has a <tt>front()</tt> method.</p> + + <table border summary=""> + <tr> + <th>Name</th> + + <th>Expression</th> + + <th>Return type</th> + + <th>Semantics</th> + </tr> + + <tr> + <td valign="top">Front</td> + + <td valign="top"><tt>a.front()</tt></td> + + <td valign="top"><tt>reference</tt> if <tt>a</tt> is mutable,<br> + <tt>const_reference</tt> otherwise.</td> + + <td valign="top">Equivalent to <tt>*(a.begin())</tt>.</td> + </tr> + </table> + + <h4>ReversibleCollection</h4> + + <p>The container provides access to iterators that traverse in both + directions (forward and reverse). The iterator type must meet all of the + requirements of <a href= + "http://www.sgi.com/tech/stl/BidirectionalIterator.html">BidirectionalIterator</a> + except that the reference type does not have to be a real C++ reference. + The ReversibleCollection adds the following requirements to those of + ForwardCollection.</p> + + <table border summary=""> + <tr> + <th>Name</th> + + <th>Expression</th> + + <th>Return type</th> + + <th>Semantics</th> + </tr> + + <tr> + <td valign="top">Beginning of range</td> + + <td valign="top"><tt>a.rbegin()</tt></td> + + <td valign="top"><tt>reverse_iterator</tt> if <tt>a</tt> is mutable, + <tt>const_reverse_iterator</tt> otherwise.</td> + + <td valign="top">Equivalent to + <tt>X::reverse_iterator(a.end())</tt>.</td> + </tr> + + <tr> + <td valign="top">End of range</td> + + <td valign="top"><tt>a.rend()</tt></td> + + <td valign="top"><tt>reverse_iterator</tt> if <tt>a</tt> is mutable, + <tt>const_reverse_iterator</tt> otherwise.</td> + + <td valign="top">Equivalent to + <tt>X::reverse_iterator(a.begin())</tt>.</td> + </tr> + + <tr> + <td valign="top">Back</td> + + <td valign="top"><tt>a.back()</tt></td> + + <td valign="top"><tt>reference</tt> if <tt>a</tt> is mutable,<br> + <tt>const_reference</tt> otherwise.</td> + + <td valign="top">Equivalent to <tt>*(--a.end())</tt>.</td> + </tr> + </table> + + <h4>SequentialCollection</h4> + + <p>The elements are arranged in a strict linear order. No extra methods are + required.</p> + + <h4>RandomAccessCollection</h4> + + <p>The iterators of a RandomAccessCollection satisfy all of the + requirements of <a href= + "http://www.sgi.com/tech/stl/RandomAccessIterator.html">RandomAccessIterator</a> + except that the reference type does not have to be a real C++ reference. In + addition, a RandomAccessCollection provides an element access operator.</p> + + <table border summary=""> + <tr> + <th>Name</th> + + <th>Expression</th> + + <th>Return type</th> + + <th>Semantics</th> + </tr> + + <tr> + <td valign="top">Element Access</td> + + <td valign="top"><tt>a[n]</tt></td> + + <td valign="top"><tt>reference</tt> if <tt>a</tt> is mutable, + <tt>const_reference</tt> otherwise.</td> + + <td valign="top">Returns the nth element of the Collection. <tt>n</tt> + must be convertible to <tt>size_type</tt>. Precondition: <tt>0 <= n + < a.size()</tt>.</td> + </tr> + </table> + + <h3>Notes</h3> + + <p><a name="n1" id="n1">[1]</a> The reference type does not have to be a + real C++ reference. The requirements of the reference type depend on the + context within which the Collection is being used. Specifically it depends + on the requirements the context places on the value type of the Collection. + The reference type of the Collection must meet the same requirements as the + value type. In addition, the reference objects must be equivalent to the + value type objects in the collection (which is trivially true if they are + the same object). Also, in a mutable Collection, an assignment to the + reference object must result in an assignment to the object in the + Collection (again, which is trivially true if they are the same object, but + non-trivial if the reference type is a proxy class).</p> + + <h3>See also</h3> + + <p><a href= + "http://www.sgi.com/tech/stl/Container.html">Container</a><br></p> + <hr> + + <p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src= + "../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional" + height="31" width="88"></a></p> + + <p>Revised + <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05 + December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p> + + <table summary=""> + <tr valign="top"> + <td nowrap><i>Copyright © 2000</i></td> + + <td><i><a href="http://www.boost.org/people/jeremy_siek.htm">Jeremy + Siek</a>, Univ.of Notre Dame and C++ Library & Compiler Group/SGI + (<a href="mailto:jsiek@engr.sgi.com">jsiek@engr.sgi.com</a>)</i></td> + </tr> + </table> + + <p><i>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>)</i></p> +</body> +</html> |