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| 3 | -- Copyright (c) Jeremy Siek 2000 |
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| 5 | -- Permission to use, copy, modify, distribute and sell this software |
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| 11 | -- purpose. It is provided "as is" without express or implied warranty. |
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| 13 | <Head> |
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| 14 | <Title>WritablePropertyMap</Title> |
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| 15 | <BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" |
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| 16 | ALINK="#ff0000"> |
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| 17 | <IMG SRC="../../boost.png" |
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| 18 | ALT="C++ Boost" width="277" height="86"> |
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| 19 | |
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| 20 | <BR Clear> |
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| 21 | |
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| 22 | |
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| 23 | <H2><A NAME="concept:WritablePropertyMap"></A> |
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| 24 | Writable Property Map |
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| 25 | </H2> |
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| 26 | |
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| 27 | A Writable Property Map has the capability of setting the value |
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| 28 | object associated with the given key object via the <tt>put()</tt> |
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| 29 | function. |
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| 30 | |
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| 31 | <h3>Refinement of</h3> |
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| 32 | |
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| 33 | <a href="../utility/CopyConstructible.html">Copy Constructible</a> |
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| 34 | |
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| 35 | |
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| 36 | <h3>Notation</h3> |
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| 37 | |
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| 38 | <Table> |
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| 39 | <TR> |
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| 40 | <TD><tt>PMap</tt></TD> |
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| 41 | <TD>A type that is a model of Writable Property Map.</TD> |
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| 42 | </TR> |
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| 43 | <TR> |
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| 44 | <TD><tt>pmap</tt></TD> |
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| 45 | <TD>An object of type <tt>PMap</tt>.</td> |
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| 46 | </TR> |
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| 47 | <TR> |
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| 48 | <TD><tt>key</tt></TD> |
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| 49 | <TD>An object of type <tt>boost::property_traits<PMap>::key_type</tt>.</td> |
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| 50 | </TR> |
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| 51 | <TR> |
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| 52 | <TD><tt>val</tt></TD> |
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| 53 | <TD>An object of type <tt>boost::property_traits<PMap>::value_type</tt>.</td> |
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| 54 | </TR> |
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| 55 | </table> |
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| 56 | |
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| 57 | <h3>Associated Types</h3> |
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| 58 | |
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| 59 | <table border> |
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| 60 | |
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| 61 | <tr> |
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| 62 | <td>Value Type</td> |
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| 63 | <td><TT>boost::property_traits<PMap>::value_type</TT></td> |
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| 64 | <td> |
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| 65 | The type of the property. |
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| 66 | </td> |
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| 67 | </tr> |
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| 68 | |
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| 69 | <tr> |
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| 70 | <td>Key Type</td> |
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| 71 | <td><TT>boost::property_traits<PMap>::key_type</TT></td> |
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| 72 | <td> |
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| 73 | The type of the key object used to look up the property. The property |
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| 74 | map may be templated on the key type, in which case this typedef |
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| 75 | can be <TT>void</TT>. |
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| 76 | </td> |
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| 77 | </tr> |
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| 78 | |
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| 79 | <tr> |
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| 80 | <td>Property Map Category </td> |
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| 81 | <td><TT>boost::property_traits<PMap>::category</TT></td> |
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| 82 | <td> |
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| 83 | The category of the property: a type convertible to |
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| 84 | <TT>writable_property_map_tag</TT>. |
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| 85 | </td> |
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| 86 | </tr> |
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| 87 | |
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| 88 | </table> |
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| 89 | |
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| 90 | |
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| 91 | <h3>Valid Expressions</h3> |
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| 92 | |
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| 93 | <table border> |
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| 94 | <tr> |
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| 95 | <th>Name</th><th>Expression</th><th>Return Type</th><th>Description</th> |
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| 96 | </tr> |
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| 97 | |
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| 98 | <tr> |
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| 99 | <td>Put Property Value<a href="#1">[1]</a></td> |
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| 100 | <TD><TT>put(pmap, key, val)</TT></TD> |
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| 101 | <TD><TT>void</TT></TD> |
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| 102 | <TD> |
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| 103 | Assign <TT>val</TT> to the property associated with <TT>k</TT>. |
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| 104 | </TD> |
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| 105 | </TR> |
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| 106 | |
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| 107 | </TABLE> |
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| 108 | |
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| 109 | |
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| 110 | <h3>Notes</h3> |
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| 111 | |
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| 112 | <a name="1">[1]</a> The function <tt>put()</tt> was originally named |
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| 113 | <tt>set()</tt>, but was changed to avoid name conflicts with the |
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| 114 | <tt>std::set</tt> class when using a compiler (Microsoft Visual C++) |
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| 115 | with non-standard name lookup rules. The following example demonstrates |
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| 116 | the problem. |
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| 117 | <pre>#include <set> |
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| 118 | using namespace std; |
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| 119 | namespace boost { |
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| 120 | void set() { } |
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| 121 | }</pre> |
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| 122 | |
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| 123 | |
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| 124 | <h3>Concept Checking Class</h3> |
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| 125 | |
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| 126 | <pre> template <class PMap, class Key> |
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| 127 | struct WritablePropertyMapConcept |
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| 128 | { |
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| 129 | typedef typename property_traits<PMap>::key_type key_type; |
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| 130 | typedef typename property_traits<PMap>::category Category; |
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| 131 | typedef boost::writable_property_map_tag WritableTag; |
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| 132 | void constraints() { |
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| 133 | function_requires< ConvertibleConcept<Category, WritableTag> >(); |
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| 134 | put(pmap, k, val); |
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| 135 | } |
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| 136 | PMap pmap; |
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| 137 | Key k; |
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| 138 | typename property_traits<PMap>::value_type val; |
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| 139 | };</pre> |
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| 140 | |
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| 141 | <h3>See Also</h3> |
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| 142 | |
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| 143 | <a href="./property_map.html">Property map concepts</a> |
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| 144 | |
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| 145 | |
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| 146 | <br> |
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| 147 | <HR> |
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| 148 | <TABLE> |
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| 149 | <TR valign=top> |
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| 150 | <TD nowrap>Copyright © 2000</TD><TD> |
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| 151 | <a HREF="../../people/jeremy_siek.htm">Jeremy Siek</a>, Univ.of Notre Dame (<A HREF="mailto:jsiek@lsc.nd.edu">jsiek@lsc.nd.edu</A>) |
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| 152 | </TD></TR></TABLE> |
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| 153 | |
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| 154 | </BODY> |
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| 155 | </HTML> |
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