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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h3 class="title"> | |
27 | <a name="boost_typetraits.reference.make_signed"></a><a class="link" href="make_signed.html" title="make_signed">make_signed</a> | |
28 | </h3></div></div></div> | |
29 | <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> | |
30 | <span class="keyword">struct</span> <span class="identifier">make_signed</span> | |
31 | <span class="special">{</span> | |
32 | <span class="keyword">typedef</span> <em class="replaceable"><code>see-below</code></em> <span class="identifier">type</span><span class="special">;</span> | |
33 | <span class="special">};</span> | |
34 | </pre> | |
35 | <p> | |
36 | <span class="bold"><strong>type:</strong></span> If T is a signed integer type then | |
37 | the same type as T, if T is an unsigned integer type then the corresponding | |
38 | signed type. Otherwise if T is an enumerated or character type (char or wchar_t) | |
39 | then a signed integer type with the same width as T. | |
40 | </p> | |
41 | <p> | |
42 | If T has any cv-qualifiers then these are also present on the result type. | |
43 | </p> | |
44 | <p> | |
45 | <span class="bold"><strong>Requires:</strong></span> T must be an integer or enumerated | |
46 | type, and must not be the type bool. | |
47 | </p> | |
48 | <p> | |
49 | <span class="bold"><strong>C++ Standard Reference:</strong></span> 3.9.1. | |
50 | </p> | |
51 | <p> | |
52 | <span class="bold"><strong>Compiler Compatibility:</strong></span> All current compilers | |
53 | are supported by this trait. | |
54 | </p> | |
55 | <p> | |
56 | <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span> | |
57 | <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">make_signed</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> | |
58 | or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> | |
59 | </p> | |
60 | <div class="table"> | |
61 | <a name="boost_typetraits.reference.make_signed.examples"></a><p class="title"><b>Table 1.23. Examples</b></p> | |
62 | <div class="table-contents"><table class="table" summary="Examples"> | |
63 | <colgroup> | |
64 | <col> | |
65 | <col> | |
66 | </colgroup> | |
67 | <thead><tr> | |
68 | <th> | |
69 | <p> | |
70 | Expression | |
71 | </p> | |
72 | </th> | |
73 | <th> | |
74 | <p> | |
75 | Result Type | |
76 | </p> | |
77 | </th> | |
78 | </tr></thead> | |
79 | <tbody> | |
80 | <tr> | |
81 | <td> | |
82 | <p> | |
83 | <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="keyword">int</span><span class="special">>::</span><span class="identifier">type</span></code> | |
84 | </p> | |
85 | </td> | |
86 | <td> | |
87 | <p> | |
88 | <code class="computeroutput"><span class="keyword">int</span></code> | |
89 | </p> | |
90 | </td> | |
91 | </tr> | |
92 | <tr> | |
93 | <td> | |
94 | <p> | |
95 | <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">int</span> | |
96 | <span class="keyword">const</span><span class="special">>::</span><span class="identifier">type</span></code> | |
97 | </p> | |
98 | </td> | |
99 | <td> | |
100 | <p> | |
101 | <code class="computeroutput"><span class="keyword">int</span> <span class="keyword">const</span></code> | |
102 | </p> | |
103 | </td> | |
104 | </tr> | |
105 | <tr> | |
106 | <td> | |
107 | <p> | |
108 | <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">unsigned</span> | |
109 | <span class="keyword">long</span> <span class="keyword">long</span><span class="special">>::</span><span class="identifier">type</span></code> | |
110 | </p> | |
111 | </td> | |
112 | <td> | |
113 | <p> | |
114 | <code class="computeroutput"><span class="keyword">const</span> <span class="keyword">long</span> | |
115 | <span class="keyword">long</span></code> | |
116 | </p> | |
117 | </td> | |
118 | </tr> | |
119 | <tr> | |
120 | <td> | |
121 | <p> | |
122 | <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="identifier">my_enum</span><span class="special">>::</span><span class="identifier">type</span></code> | |
123 | </p> | |
124 | </td> | |
125 | <td> | |
126 | <p> | |
127 | A signed integer type with the same width as the enum. | |
128 | </p> | |
129 | </td> | |
130 | </tr> | |
131 | <tr> | |
132 | <td> | |
133 | <p> | |
134 | <code class="computeroutput"><span class="identifier">make_signed</span><span class="special"><</span><span class="keyword">wchar_t</span><span class="special">>::</span><span class="identifier">type</span></code> | |
135 | </p> | |
136 | </td> | |
137 | <td> | |
138 | <p> | |
139 | A signed integer type with the same width as wchar_t. | |
140 | </p> | |
141 | </td> | |
142 | </tr> | |
143 | </tbody> | |
144 | </table></div> | |
145 | </div> | |
146 | <br class="table-break"> | |
147 | </div> | |
148 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
149 | <td align="left"></td> | |
150 | <td align="right"><div class="copyright-footer">Copyright © 2000, 2011 Adobe Systems Inc, David Abrahams, | |
151 | Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant, | |
152 | Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten | |
153 | Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven | |
154 | Watanabe<p> | |
155 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
156 | file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) | |
157 | </p> | |
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