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41 | <h1>variant.hpp</h1><a href="variant_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span> | |
42 | <a name="l00002"></a>00002 <span class="comment"> Copyright 2005-2007 Adobe Systems Incorporated</span> | |
43 | <a name="l00003"></a>00003 <span class="comment"> </span> | |
44 | <a name="l00004"></a>00004 <span class="comment"> Use, modification and distribution are subject to the Boost Software License,</span> | |
45 | <a name="l00005"></a>00005 <span class="comment"> Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span> | |
46 | <a name="l00006"></a>00006 <span class="comment"> http://www.boost.org/LICENSE_1_0.txt).</span> | |
47 | <a name="l00007"></a>00007 <span class="comment"></span> | |
48 | <a name="l00008"></a>00008 <span class="comment"> See http://opensource.adobe.com/gil for most recent version including documentation.</span> | |
49 | <a name="l00009"></a>00009 <span class="comment">*/</span> | |
50 | <a name="l00010"></a>00010 | |
51 | <a name="l00011"></a>00011 <span class="comment">/*************************************************************************************************/</span> | |
52 | <a name="l00012"></a>00012 | |
53 | <a name="l00013"></a>00013 <span class="preprocessor">#ifndef GIL_DYNAMICIMAGE_VARIANT_HPP</span> | |
54 | <a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#define GIL_DYNAMICIMAGE_VARIANT_HPP</span> | |
55 | <a name="l00015"></a>00015 <span class="preprocessor"></span> | |
56 | <a name="l00024"></a>00024 | |
57 | <a name="l00025"></a>00025 <span class="preprocessor">#include "../../gil_config.hpp"</span> | |
58 | <a name="l00026"></a>00026 <span class="preprocessor">#include "../../utilities.hpp"</span> | |
59 | <a name="l00027"></a>00027 <span class="preprocessor">#include <cstddef></span> | |
60 | <a name="l00028"></a>00028 <span class="preprocessor">#include <cassert></span> | |
61 | <a name="l00029"></a>00029 <span class="preprocessor">#include <algorithm></span> | |
62 | <a name="l00030"></a>00030 <span class="preprocessor">#include <typeinfo></span> | |
63 | <a name="l00031"></a>00031 <span class="preprocessor">#include <boost/bind.hpp></span> | |
64 | <a name="l00032"></a>00032 | |
65 | <a name="l00033"></a>00033 <span class="preprocessor">#include <boost/mpl/transform.hpp></span> | |
66 | <a name="l00034"></a>00034 <span class="preprocessor">#include <boost/mpl/size.hpp></span> | |
67 | <a name="l00035"></a>00035 <span class="preprocessor">#include <boost/mpl/sizeof.hpp></span> | |
68 | <a name="l00036"></a>00036 <span class="preprocessor">#include <boost/mpl/max.hpp></span> | |
69 | <a name="l00037"></a>00037 <span class="preprocessor">#include <boost/mpl/at.hpp></span> | |
70 | <a name="l00038"></a>00038 <span class="preprocessor">#include <boost/mpl/fold.hpp></span> | |
71 | <a name="l00039"></a>00039 | |
72 | <a name="l00040"></a>00040 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>gil { | |
73 | <a name="l00041"></a>00041 | |
74 | <a name="l00042"></a>00042 <span class="keyword">namespace </span>detail { | |
75 | <a name="l00043"></a>00043 <span class="keyword">template</span> <<span class="keyword">typename</span> Types, <span class="keyword">typename</span> T> <span class="keyword">struct </span>type_to_index; | |
76 | <a name="l00044"></a>00044 <span class="keyword">template</span> <<span class="keyword">typename</span> Op, <span class="keyword">typename</span> T> <span class="keyword">struct </span>reduce; | |
77 | <a name="l00045"></a>00045 <span class="keyword">struct </span>destructor_op { | |
78 | <a name="l00046"></a>00046 <span class="keyword">typedef</span> <span class="keywordtype">void</span> result_type; | |
79 | <a name="l00047"></a>00047 <span class="keyword">template</span> <<span class="keyword">typename</span> T> result_type operator()(<span class="keyword">const</span> T& t)<span class="keyword"> const </span>{ t.~T(); } | |
80 | <a name="l00048"></a>00048 }; | |
81 | <a name="l00049"></a>00049 <span class="keyword">template</span> <<span class="keyword">typename</span> T, <span class="keyword">typename</span> Bits> <span class="keywordtype">void</span> copy_construct_in_place(<span class="keyword">const</span> T& t, Bits& bits); | |
82 | <a name="l00050"></a>00050 <span class="keyword">template</span> <<span class="keyword">typename</span> Bits> <span class="keyword">struct </span>copy_construct_in_place_fn; | |
83 | <a name="l00051"></a>00051 } | |
84 | <a name="l00086"></a>00086 <span class="keyword">template</span> <<span class="keyword">typename</span> Types> <span class="comment">// models MPL Random Access Container</span> | |
85 | <a name="l00087"></a><a class="code" href="g_i_l_0062.html">00087</a> <span class="keyword">class </span><a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a> { | |
86 | <a name="l00088"></a>00088 <span class="comment">// size in bytes of the largest type in Types</span> | |
87 | <a name="l00089"></a>00089 <span class="keyword">static</span> <span class="keyword">const</span> std::size_t MAX_SIZE = mpl::fold<Types, mpl::size_t<0>, mpl::max<mpl::_1, mpl::sizeof_<mpl::_2> > >::type::value; | |
88 | <a name="l00090"></a>00090 <span class="keyword">static</span> <span class="keyword">const</span> std::size_t NUM_TYPES = mpl::size<Types>::value; | |
89 | <a name="l00091"></a>00091 <span class="keyword">public</span>: | |
90 | <a name="l00092"></a>00092 <span class="keyword">typedef</span> Types types_t; | |
91 | <a name="l00093"></a>00093 | |
92 | <a name="l00094"></a>00094 <span class="keyword">typedef</span> <span class="keyword">struct </span>{ <span class="keywordtype">char</span> data[MAX_SIZE]; } base_t; <span class="comment">// empty space equal to the size of the largest type in Types</span> | |
93 | <a name="l00095"></a>00095 | |
94 | <a name="l00096"></a>00096 <span class="comment">// Default constructor - default construct the first type</span> | |
95 | <a name="l00097"></a>00097 <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>() : _index(0) { <span class="keyword">new</span>(&_bits) <span class="keyword">typename</span> mpl::at_c<Types,0>::type(); } | |
96 | <a name="l00098"></a>00098 <span class="keyword">virtual</span> ~<a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>() { apply_operation(*<span class="keyword">this</span>, detail::destructor_op()); } | |
97 | <a name="l00099"></a>00099 | |
98 | <a name="l00100"></a>00100 <span class="comment">// Throws std::bad_cast if T is not in Types</span> | |
99 | <a name="l00101"></a>00101 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">explicit</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>(<span class="keyword">const</span> T& obj){ _index=type_id<T>(); <span class="keywordflow">if</span> (_index==NUM_TYPES) <span class="keywordflow">throw</span> std::bad_cast(); detail::copy_construct_in_place(obj, _bits); } | |
100 | <a name="l00102"></a>00102 | |
101 | <a name="l00103"></a>00103 <span class="comment">// When doSwap is true, swaps obj with the contents of the variant. obj will contain default-constructed instance after the call</span> | |
102 | <a name="l00104"></a>00104 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">explicit</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>(T& obj, <span class="keywordtype">bool</span> do_swap); | |
103 | <a name="l00105"></a>00105 | |
104 | <a name="l00106"></a>00106 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>& operator=(<span class="keyword">const</span> T& obj) { <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a> tmp(obj); swap(*<span class="keyword">this</span>,tmp); <span class="keywordflow">return</span> *<span class="keyword">this</span>; } | |
105 | <a name="l00107"></a>00107 <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>& operator=(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>& v) { <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a> tmp(v ); swap(*<span class="keyword">this</span>,tmp); <span class="keywordflow">return</span> *<span class="keyword">this</span>; } | |
106 | <a name="l00108"></a>00108 | |
107 | <a name="l00109"></a>00109 <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a>& v) : _index(v.<a class="code" href="g_i_l_0062.html#ab24a1a4e3ad662acbc481b2ce8d8cb8">_index</a>) { apply_operation(v, detail::copy_construct_in_place_fn<base_t>(_bits)); } | |
108 | <a name="l00110"></a>00110 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keywordtype">void</span> move_in(T& obj) { <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant</a> tmp(obj, <span class="keyword">true</span>); swap(*<span class="keyword">this</span>,tmp); } | |
109 | <a name="l00111"></a>00111 | |
110 | <a name="l00112"></a>00112 <span class="keyword">template</span> <<span class="keyword">typename</span> TS> <span class="keyword">friend</span> <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<TS></a>& x, <span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<TS></a>& y); | |
111 | <a name="l00113"></a>00113 <span class="keyword">template</span> <<span class="keyword">typename</span> TS> <span class="keyword">friend</span> <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<TS></a>& x, <span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<TS></a>& y); | |
112 | <a name="l00114"></a>00114 | |
113 | <a name="l00115"></a>00115 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">static</span> <span class="keywordtype">bool</span> has_type() { <span class="keywordflow">return</span> type_id<T>()!=NUM_TYPES; } | |
114 | <a name="l00116"></a>00116 | |
115 | <a name="l00117"></a>00117 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">const</span> T& _dynamic_cast()<span class="keyword"> const </span>{ <span class="keywordflow">if</span> (!current_type_is<T>()) <span class="keywordflow">throw</span> std::bad_cast(); <span class="keywordflow">return</span> *gil_reinterpret_cast_c<const T*>(&_bits); } | |
116 | <a name="l00118"></a>00118 <span class="keyword">template</span> <<span class="keyword">typename</span> T> T& _dynamic_cast() { <span class="keywordflow">if</span> (!current_type_is<T>()) <span class="keywordflow">throw</span> std::bad_cast(); <span class="keywordflow">return</span> *gil_reinterpret_cast < T*>(&_bits); } | |
117 | <a name="l00119"></a>00119 | |
118 | <a name="l00120"></a>00120 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keywordtype">bool</span> current_type_is()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> type_id<T>()==_index; } | |
119 | <a name="l00121"></a>00121 | |
120 | <a name="l00122"></a>00122 <span class="keyword">private</span>: | |
121 | <a name="l00123"></a>00123 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keyword">static</span> std::size_t type_id() { <span class="keywordflow">return</span> <a class="code" href="g_i_l_0522.html" title="Returns the index corresponding to the first occurrance of a given given type in...">detail::type_to_index<Types,T>::value</a>; } | |
122 | <a name="l00124"></a>00124 | |
123 | <a name="l00125"></a>00125 <span class="keyword">template</span> <<span class="keyword">typename</span> Cs> <span class="keyword">friend</span> <span class="keywordtype">void</span> swap(<a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<Cs></a>& x, <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<Cs></a>& y); | |
124 | <a name="l00126"></a>00126 <span class="keyword">template</span> <<span class="keyword">typename</span> Types2, <span class="keyword">typename</span> UnaryOp> <span class="keyword">friend</span> <span class="keyword">typename</span> UnaryOp::result_type apply_operation(<a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<Types2></a>& var, UnaryOp op); | |
125 | <a name="l00127"></a>00127 <span class="keyword">template</span> <<span class="keyword">typename</span> Types2, <span class="keyword">typename</span> UnaryOp> <span class="keyword">friend</span> <span class="keyword">typename</span> UnaryOp::result_type apply_operation(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<Types2></a>& var, UnaryOp op); | |
126 | <a name="l00128"></a>00128 <span class="keyword">template</span> <<span class="keyword">typename</span> Types1, <span class="keyword">typename</span> Types2, <span class="keyword">typename</span> BinaryOp> <span class="keyword">friend</span> <span class="keyword">typename</span> BinaryOp::result_type apply_operation(<span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<Types1></a>& arg1, <span class="keyword">const</span> <a class="code" href="g_i_l_0062.html" title="Represents a concrete instance of a run-time specified type from a set of typesA...">variant<Types2></a>& arg2, BinaryOp op); | |
127 | <a name="l00129"></a>00129 | |
128 | <a name="l00130"></a>00130 base_t _bits; | |
129 | <a name="l00131"></a>00131 std::size_t _index; | |
130 | <a name="l00132"></a>00132 }; | |
131 | <a name="l00133"></a>00133 | |
132 | <a name="l00134"></a>00134 <span class="keyword">namespace </span>detail { | |
133 | <a name="l00135"></a>00135 | |
134 | <a name="l00136"></a>00136 <span class="keyword">template</span> <<span class="keyword">typename</span> T, <span class="keyword">typename</span> Bits> | |
135 | <a name="l00137"></a>00137 <span class="keywordtype">void</span> copy_construct_in_place(<span class="keyword">const</span> T& t, Bits& bits) { | |
136 | <a name="l00138"></a>00138 T& b=*gil_reinterpret_cast<T*>(&bits); | |
137 | <a name="l00139"></a>00139 <span class="keyword">new</span>(&b)T(t); <span class="comment">// default-construct</span> | |
138 | <a name="l00140"></a>00140 } | |
139 | <a name="l00141"></a>00141 | |
140 | <a name="l00142"></a>00142 <span class="keyword">template</span> <<span class="keyword">typename</span> Bits> | |
141 | <a name="l00143"></a>00143 <span class="keyword">struct </span>copy_construct_in_place_fn { | |
142 | <a name="l00144"></a>00144 <span class="keyword">typedef</span> <span class="keywordtype">void</span> result_type; | |
143 | <a name="l00145"></a>00145 Bits& _dst; | |
144 | <a name="l00146"></a>00146 copy_construct_in_place_fn(Bits& dst) : _dst(dst) {} | |
145 | <a name="l00147"></a>00147 | |
146 | <a name="l00148"></a>00148 <span class="keyword">template</span> <<span class="keyword">typename</span> T> <span class="keywordtype">void</span> operator()(<span class="keyword">const</span> T& src)<span class="keyword"> const </span>{ copy_construct_in_place(src,_dst); } | |
147 | <a name="l00149"></a>00149 }; | |
148 | <a name="l00150"></a>00150 | |
149 | <a name="l00151"></a>00151 <span class="keyword">template</span> <<span class="keyword">typename</span> Bits> | |
150 | <a name="l00152"></a>00152 <span class="keyword">struct </span>equal_to_fn { | |
151 | <a name="l00153"></a>00153 <span class="keyword">const</span> Bits& _dst; | |
152 | <a name="l00154"></a>00154 equal_to_fn(<span class="keyword">const</span> Bits& dst) : _dst(dst) {} | |
153 | <a name="l00155"></a>00155 | |
154 | <a name="l00156"></a>00156 <span class="keyword">typedef</span> <span class="keywordtype">bool</span> result_type; | |
155 | <a name="l00157"></a>00157 <span class="keyword">template</span> <<span class="keyword">typename</span> T> result_type operator()(<span class="keyword">const</span> T& x)<span class="keyword"> const </span>{ | |
156 | <a name="l00158"></a>00158 <span class="keywordflow">return</span> x==*gil_reinterpret_cast_c<const T*>(&_dst); | |
157 | <a name="l00159"></a>00159 } | |
158 | <a name="l00160"></a>00160 }; | |
159 | <a name="l00161"></a>00161 } | |
160 | <a name="l00162"></a>00162 | |
161 | <a name="l00163"></a>00163 <span class="comment">// When doSwap is true, swaps obj with the contents of the variant. obj will contain default-constructed instance after the call</span> | |
162 | <a name="l00164"></a>00164 <span class="keyword">template</span> <<span class="keyword">typename</span> Types> | |
163 | <a name="l00165"></a>00165 <span class="keyword">template</span> <<span class="keyword">typename</span> T> variant<Types>::variant(T& obj, <span class="keywordtype">bool</span> do_swap) { | |
164 | <a name="l00166"></a>00166 _index=type_id<T>(); | |
165 | <a name="l00167"></a>00167 <span class="keywordflow">if</span> (_index==NUM_TYPES) <span class="keywordflow">throw</span> std::bad_cast(); | |
166 | <a name="l00168"></a>00168 | |
167 | <a name="l00169"></a>00169 <span class="keywordflow">if</span> (do_swap) { | |
168 | <a name="l00170"></a>00170 <span class="keyword">new</span>(&_bits) T(); <span class="comment">// default construct</span> | |
169 | <a name="l00171"></a>00171 swap(obj, *gil_reinterpret_cast<T*>(&_bits)); | |
170 | <a name="l00172"></a>00172 } <span class="keywordflow">else</span> | |
171 | <a name="l00173"></a>00173 detail::copy_construct_in_place(const_cast<const T&>(obj), _bits); | |
172 | <a name="l00174"></a>00174 } | |
173 | <a name="l00175"></a>00175 | |
174 | <a name="l00176"></a>00176 <span class="keyword">template</span> <<span class="keyword">typename</span> Types> | |
175 | <a name="l00177"></a>00177 <span class="keywordtype">void</span> swap(variant<Types>& x, variant<Types>& y) { | |
176 | <a name="l00178"></a>00178 std::swap(x._bits,y._bits); | |
177 | <a name="l00179"></a>00179 std::swap(x._index, y._index); | |
178 | <a name="l00180"></a>00180 } | |
179 | <a name="l00181"></a>00181 | |
180 | <a name="l00182"></a>00182 <span class="keyword">template</span> <<span class="keyword">typename</span> Types> | |
181 | <a name="l00183"></a>00183 <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> variant<Types>& x, <span class="keyword">const</span> variant<Types>& y) { | |
182 | <a name="l00184"></a>00184 <span class="keywordflow">return</span> x._index==y._index && <a class="code" href="group___variant.html#g3dc0a90911c08815be11e1e49ec06037" title="Invokes a generic constant operation (represented as a binary function object) on...">apply_operation</a>(x,detail::equal_to_fn<<span class="keyword">typename</span> variant<Types>::base_t>(y._bits)); | |
183 | <a name="l00185"></a>00185 } | |
184 | <a name="l00186"></a>00186 | |
185 | <a name="l00187"></a>00187 <span class="keyword">template</span> <<span class="keyword">typename</span> C> | |
186 | <a name="l00188"></a>00188 <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> variant<C>& x, <span class="keyword">const</span> variant<C>& y) { | |
187 | <a name="l00189"></a>00189 <span class="keywordflow">return</span> !(x==y); | |
188 | <a name="l00190"></a>00190 } | |
189 | <a name="l00191"></a>00191 | |
190 | <a name="l00192"></a>00192 } } <span class="comment">// namespace boost::gil</span> | |
191 | <a name="l00193"></a>00193 | |
192 | <a name="l00194"></a>00194 <span class="preprocessor">#endif</span> | |
193 | </pre></div></div> | |
194 | <hr size="1"><address style="text-align: right;"><small>Generated on Sat May 2 13:50:15 2009 for Generic Image Library by | |
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196 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address> | |
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