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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h3 class="title"> | |
27 | <a name="phoenix.lazy_list.implementation_details"></a><a class="link" href="implementation_details.html" title="Implementation Details">Implementation | |
28 | Details</a> | |
29 | </h3></div></div></div> | |
30 | <h3> | |
31 | <a name="phoenix.lazy_list.implementation_details.h0"></a> | |
32 | <span><a name="phoenix.lazy_list.implementation_details.introduction"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.introduction">Introduction</a> | |
33 | </h3> | |
34 | <p> | |
35 | The implementation has depended on close study of the existing code of <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a>. The <a href="http://people.cs.umass.edu/~yannis/fc++/New/new_list_implementation.html" target="_top">FC++ | |
36 | List Implementation</a> is a carefully crafted code which allows for | |
37 | efficient processing of a number of different cases. In particular it makes | |
38 | use of the <a href="http://people.cs.umass.edu/~yannis/fc++/New/reusers.html" target="_top">FC++ | |
39 | Reuser Implementation</a> for processing of repetitive evaluations. | |
40 | </p> | |
41 | <p> | |
42 | <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> uses a combination | |
43 | of polymorphic and single type functions which can be passed as arguments | |
44 | to other functions. | |
45 | </p> | |
46 | <p> | |
47 | The implementation of list<T> has needed new implementations of the | |
48 | strategy using the facilities of Boost Phoenix and also Boost Function. It | |
49 | turns out that a combination of both can be used to meet the needs of list<T>. | |
50 | </p> | |
51 | <p> | |
52 | The fact that the functions are defined by boost::phoenix::function means | |
53 | that they work with phoenix arguments such as 'arg1'. This is the fact which | |
54 | ensures the flexibility needed for the user to build new functions as needed. | |
55 | </p> | |
56 | <h3> | |
57 | <a name="phoenix.lazy_list.implementation_details.h1"></a> | |
58 | <span><a name="phoenix.lazy_list.implementation_details.fc___legacy"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.fc___legacy">FC++ legacy</a> | |
59 | </h3> | |
60 | <p> | |
61 | The <a href="http://people.cs.umass.edu/~yannis/fc++/New/new_list_implementation.html" target="_top">FC++ | |
62 | List Implementation</a> and the <a href="http://people.cs.umass.edu/~yannis/fc++/New/reusers.html" target="_top">FC++ | |
63 | Reuser Implementation</a> have been followed very closely in building | |
64 | this code. The version used as the starting point was the <a href="http://cgi.di.uoa.gr/~smaragd/fc++/boostpaper/" target="_top">Boost | |
65 | FC++</a> version. | |
66 | </p> | |
67 | <h3> | |
68 | <a name="phoenix.lazy_list.implementation_details.h2"></a> | |
69 | <span><a name="phoenix.lazy_list.implementation_details.polymorphic_function_types"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.polymorphic_function_types">Polymorphic | |
70 | Function Types</a> | |
71 | </h3> | |
72 | <p> | |
73 | Functions are implemented as a struct within namespace impl. For an example | |
74 | funcion 'x' the type is defined like this: | |
75 | </p> | |
76 | <pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span><span class="identifier">impl</span><span class="special">::</span><span class="identifier">X</span><span class="special">></span> <span class="identifier">X</span><span class="special">;</span> | |
77 | <span class="identifier">X</span> <span class="identifier">x</span> | |
78 | </pre> | |
79 | <p> | |
80 | This alternative will work to provide a function 'x' but it is not then possible | |
81 | to pass it as an argument. | |
82 | </p> | |
83 | <pre class="programlisting"><span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE</span><span class="special">(</span><span class="identifier">x</span><span class="special">,</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">X</span><span class="special">,</span> <span class="number">1</span><span class="special">)</span> | |
84 | </pre> | |
85 | <h4> | |
86 | <a name="phoenix.lazy_list.implementation_details.h3"></a> | |
87 | <span><a name="phoenix.lazy_list.implementation_details.implementation_example"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.implementation_example">Implementation | |
88 | Example</a> | |
89 | </h4> | |
90 | <p> | |
91 | This example implements id() which simply returns its argument: | |
92 | </p> | |
93 | <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">impl</span> <span class="special">{</span> | |
94 | ||
95 | <span class="keyword">struct</span> <span class="identifier">Id</span> | |
96 | <span class="special">{</span> | |
97 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">></span> | |
98 | <span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span> | |
99 | ||
100 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">This</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">></span> | |
101 | <span class="keyword">struct</span> <span class="identifier">result</span><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">A0</span><span class="special">)></span> | |
102 | <span class="special">:</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">A0</span><span class="special">></span> | |
103 | <span class="special">{};</span> | |
104 | ||
105 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">></span> | |
106 | <span class="identifier">A0</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">A0</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a0</span><span class="special">)</span> <span class="keyword">const</span> | |
107 | <span class="special">{</span> | |
108 | <span class="keyword">return</span> <span class="identifier">a0</span><span class="special">;</span> | |
109 | <span class="special">}</span> | |
110 | ||
111 | <span class="special">};</span> | |
112 | ||
113 | <span class="special">}</span> | |
114 | ||
115 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span><span class="identifier">impl</span><span class="special">::</span><span class="identifier">Id</span><span class="special">></span> <span class="identifier">Id</span><span class="special">;</span> | |
116 | <span class="identifier">Id</span> <span class="identifier">id</span><span class="special">;</span> | |
117 | </pre> | |
118 | <h3> | |
119 | <a name="phoenix.lazy_list.implementation_details.h4"></a> | |
120 | <span><a name="phoenix.lazy_list.implementation_details.functions_with_defined_return_type"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.functions_with_defined_return_type">Functions | |
121 | with defined return type</a> | |
122 | </h3> | |
123 | <p> | |
124 | Sometimes it is necessary to define a function using a templated struct, | |
125 | where the template parameter type defines the return type. | |
126 | </p> | |
127 | <h4> | |
128 | <a name="phoenix.lazy_list.implementation_details.h5"></a> | |
129 | <span><a name="phoenix.lazy_list.implementation_details.example_with_one_argument"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.example_with_one_argument">Example | |
130 | with one argument</a> | |
131 | </h4> | |
132 | <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">impl</span> <span class="special">{</span> | |
133 | ||
134 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Result</span><span class="special">></span> | |
135 | <span class="keyword">struct</span> <span class="identifier">what</span> <span class="special">{</span> | |
136 | ||
137 | <span class="keyword">typedef</span> <span class="identifier">Result</span> <span class="identifier">result_type</span><span class="special">;</span> | |
138 | ||
139 | <span class="identifier">Result</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Result</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">r</span><span class="special">)</span> <span class="keyword">const</span> | |
140 | <span class="special">{</span> | |
141 | <span class="keyword">return</span> <span class="identifier">r</span><span class="special">;</span> | |
142 | <span class="special">}</span> | |
143 | <span class="special">};</span> | |
144 | ||
145 | <span class="special">}</span> | |
146 | ||
147 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function1</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span> <span class="special">></span> <span class="identifier">what_int</span> <span class="special">=</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">what</span><span class="special"><</span><span class="keyword">int</span><span class="special">>();</span> | |
148 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function1</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">fun1_int_int</span><span class="special">;</span> | |
149 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span><span class="identifier">fun1_int_int</span><span class="special">></span> <span class="identifier">What_arg</span><span class="special">;</span> | |
150 | <span class="identifier">What_arg</span> <span class="identifier">what_arg</span><span class="special">(</span><span class="identifier">what_int</span><span class="special">);</span> | |
151 | </pre> | |
152 | <h4> | |
153 | <a name="phoenix.lazy_list.implementation_details.h6"></a> | |
154 | <span><a name="phoenix.lazy_list.implementation_details.example_with_zero_arguments"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.example_with_zero_arguments">Example | |
155 | with zero arguments</a> | |
156 | </h4> | |
157 | <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">impl</span> <span class="special">{</span> | |
158 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Result</span><span class="special">></span> | |
159 | <span class="keyword">struct</span> <span class="identifier">what0</span> <span class="special">{</span> | |
160 | ||
161 | <span class="keyword">typedef</span> <span class="identifier">Result</span> <span class="identifier">result_type</span><span class="special">;</span> | |
162 | ||
163 | <span class="identifier">Result</span> <span class="keyword">operator</span><span class="special">()()</span> <span class="keyword">const</span> | |
164 | <span class="special">{</span> | |
165 | <span class="keyword">return</span> <span class="identifier">Result</span><span class="special">(</span><span class="number">100</span><span class="special">);</span> | |
166 | <span class="special">}</span> | |
167 | ||
168 | <span class="special">};</span> | |
169 | <span class="special">}</span> | |
170 | ||
171 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function0</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">fun0_int</span><span class="special">;</span> | |
172 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function0</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">what0_int</span> <span class="special">=</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">what0</span><span class="special"><</span><span class="keyword">int</span><span class="special">>();</span> | |
173 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span><span class="identifier">fun0_int</span><span class="special">></span> <span class="identifier">What0_arg</span><span class="special">;</span> | |
174 | <span class="identifier">What0_arg</span> <span class="identifier">what0_arg</span><span class="special">(</span><span class="identifier">what0_int</span><span class="special">);</span> | |
175 | </pre> | |
176 | <h3> | |
177 | <a name="phoenix.lazy_list.implementation_details.h7"></a> | |
178 | <span><a name="phoenix.lazy_list.implementation_details.list_generation_implementation"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.list_generation_implementation">List | |
179 | Generation Implementation</a> | |
180 | </h3> | |
181 | <p> | |
182 | The implementation of the function | |
183 | </p> | |
184 | <pre class="programlisting"><span class="identifier">enum_from</span><span class="special">(</span><span class="number">1</span><span class="special">)</span> | |
185 | </pre> | |
186 | <p> | |
187 | requires a functor which will evaluate the successive numbers on demand. | |
188 | The code from <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> | |
189 | has been reimplemented using internal functors as follows. | |
190 | </p> | |
191 | <p> | |
192 | This code has to carefully manipulate the input type T to construct the result | |
193 | type which is a list. | |
194 | </p> | |
195 | <p> | |
196 | The code in EFH is used to build a series of objects which each add one element | |
197 | to the list and return the function which will add the next element. That | |
198 | only gets called when it is needed. | |
199 | </p> | |
200 | <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> | |
201 | <span class="keyword">struct</span> <span class="identifier">EFH</span> | |
202 | <span class="special">{</span> | |
203 | <span class="keyword">mutable</span> <span class="identifier">T</span> <span class="identifier">x</span><span class="special">;</span> | |
204 | <span class="identifier">EFH</span><span class="special">(</span> <span class="keyword">const</span> <span class="identifier">T</span><span class="special">&</span> <span class="identifier">xx</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">x</span><span class="special">(</span><span class="identifier">xx</span><span class="special">)</span> <span class="special">{}</span> | |
205 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span> | |
206 | ||
207 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">This</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">TT</span><span class="special">></span> | |
208 | <span class="keyword">struct</span> <span class="identifier">result</span><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">TT</span><span class="special">)></span> | |
209 | <span class="special">{</span> | |
210 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">UseList</span><span class="special">::</span><span class="keyword">template</span> | |
211 | <span class="identifier">List</span><span class="special"><</span><span class="identifier">TT</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">LType</span><span class="special">;</span> | |
212 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span> | |
213 | <span class="identifier">ListType</span><span class="special"><</span><span class="identifier">LType</span><span class="special">>::</span><span class="identifier">delay_result_type</span> <span class="identifier">type</span><span class="special">;</span> | |
214 | <span class="special">};</span> | |
215 | <span class="keyword">typename</span> <span class="identifier">result</span><span class="special"><</span><span class="identifier">EFH</span><span class="special">(</span><span class="identifier">T</span><span class="special">)>::</span><span class="identifier">type</span> <span class="keyword">operator</span><span class="special">()()</span> <span class="keyword">const</span> <span class="special">{</span> | |
216 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">UseList</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">List</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">LType</span><span class="special">;</span> | |
217 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">ListType</span><span class="special"><</span><span class="identifier">LType</span><span class="special">>::</span> | |
218 | <span class="identifier">delay_result_type</span> <span class="identifier">result_type</span><span class="special">;</span> | |
219 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function0</span><span class="special"><</span><span class="identifier">result_type</span><span class="special">></span> <span class="identifier">fun1_R_TTT</span><span class="special">;</span> | |
220 | <span class="special">++</span><span class="identifier">x</span><span class="special">;</span> | |
221 | <span class="identifier">fun1_R_TTT</span> <span class="identifier">efh_R_TTT</span> <span class="special">=</span> <span class="identifier">EFH</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">x</span><span class="special">);</span> | |
222 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span><span class="identifier">fun1_R_TTT</span><span class="special">></span> <span class="identifier">EFH_R_T</span><span class="special">;</span> | |
223 | <span class="identifier">EFH_R_T</span> <span class="identifier">efh_R_T</span><span class="special">(</span><span class="identifier">efh_R_TTT</span><span class="special">);</span> | |
224 | <span class="preprocessor">#ifndef</span> <span class="identifier">BOOST_PHOENIX_NO_LAZY_EXCEPTIONS</span> | |
225 | <span class="keyword">if</span> <span class="special">(</span><span class="identifier">x</span> <span class="special">></span> <span class="identifier">BOOST_PHOENIX_FUNCTION_MAX_LAZY_LIST_LENGTH</span><span class="special">)</span> | |
226 | <span class="keyword">throw</span> <span class="identifier">lazy_exception</span><span class="special">(</span><span class="string">"Running away in EFH!!"</span><span class="special">);</span> | |
227 | <span class="preprocessor">#endif</span> | |
228 | <span class="keyword">return</span> <span class="identifier">cons</span><span class="special">(</span> <span class="identifier">x</span><span class="special">-</span><span class="number">1</span><span class="special">,</span> <span class="identifier">efh_R_T</span><span class="special">()</span> <span class="special">);</span> | |
229 | <span class="special">}</span> | |
230 | <span class="special">};</span> | |
231 | ||
232 | <span class="keyword">struct</span> <span class="identifier">Enum_from</span> <span class="special">{</span> | |
233 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">></span> <span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span> | |
234 | ||
235 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">This</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> | |
236 | <span class="keyword">struct</span> <span class="identifier">result</span><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">T</span><span class="special">)></span> | |
237 | <span class="special">{</span> | |
238 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">TT</span><span class="special">;</span> | |
239 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">remove_const</span><span class="special"><</span><span class="identifier">TT</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">TTT</span><span class="special">;</span> | |
240 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">UseList</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">List</span><span class="special"><</span><span class="identifier">TTT</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">LType</span><span class="special">;</span> | |
241 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">ListType</span><span class="special"><</span><span class="identifier">LType</span><span class="special">>::</span> | |
242 | <span class="identifier">delay_result_type</span> <span class="identifier">type</span><span class="special">;</span> | |
243 | <span class="special">};</span> | |
244 | ||
245 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> | |
246 | <span class="keyword">typename</span> <span class="identifier">result</span><span class="special"><</span><span class="identifier">Enum_from</span><span class="special">(</span><span class="identifier">T</span><span class="special">)>::</span><span class="identifier">type</span> <span class="keyword">operator</span><span class="special">()</span> | |
247 | <span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&</span> <span class="identifier">x</span><span class="special">)</span> <span class="keyword">const</span> | |
248 | <span class="special">{</span> | |
249 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">TT</span><span class="special">;</span> | |
250 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">remove_const</span><span class="special"><</span><span class="identifier">TT</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">TTT</span><span class="special">;</span> | |
251 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">UseList</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">List</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">LType</span><span class="special">;</span> | |
252 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">result_of</span><span class="special">::</span><span class="identifier">ListType</span><span class="special"><</span><span class="identifier">LType</span><span class="special">>::</span> | |
253 | <span class="identifier">delay_result_type</span> <span class="identifier">result_type</span><span class="special">;</span> | |
254 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function0</span><span class="special"><</span><span class="identifier">result_type</span><span class="special">></span> <span class="identifier">fun1_R_TTT</span><span class="special">;</span> | |
255 | <span class="identifier">fun1_R_TTT</span> <span class="identifier">efh_R_TTT</span> <span class="special">=</span> <span class="identifier">EFH</span><span class="special"><</span><span class="identifier">TTT</span><span class="special">>(</span><span class="identifier">x</span><span class="special">);</span> | |
256 | <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span><span class="identifier">fun1_R_TTT</span><span class="special">></span> <span class="identifier">EFH_R_T</span><span class="special">;</span> | |
257 | <span class="identifier">EFH_R_T</span> <span class="identifier">efh_R_T</span><span class="special">(</span><span class="identifier">efh_R_TTT</span><span class="special">);</span> | |
258 | <span class="comment">//std::cout << "enum_from (" << x << ")" << std::endl;</span> | |
259 | <span class="keyword">return</span> <span class="identifier">efh_R_T</span><span class="special">();</span> | |
260 | <span class="special">}</span> | |
261 | <span class="special">};</span> | |
262 | </pre> | |
263 | <p> | |
264 | Similar code is used in the related functors | |
265 | </p> | |
266 | <pre class="programlisting"><span class="identifier">enum_from_to</span> | |
267 | <span class="identifier">filter</span> | |
268 | </pre> | |
269 | <h3> | |
270 | <a name="phoenix.lazy_list.implementation_details.h8"></a> | |
271 | <span><a name="phoenix.lazy_list.implementation_details.conclusion"></a></span><a class="link" href="implementation_details.html#phoenix.lazy_list.implementation_details.conclusion">Conclusion</a> | |
272 | </h3> | |
273 | <p> | |
274 | These implementation mechanisms have been carried through consistently in | |
275 | the implementation. | |
276 | </p> | |
277 | </div> | |
278 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
279 | <td align="left"></td> | |
280 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
281 | Heller, John Fletcher<p> | |
282 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
283 | 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>) | |
284 | </p> | |
285 | </div></td> | |
286 | </tr></table> | |
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