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 24</div>
 25<div class="section">
 26<div class="titlepage"><div><div><h3 class="title">
 27<a name="phoenix.modules.operator"></a><a class="link" href="operator.html" title="Operator">Operator</a>
 28</h3></div></div></div>
 29<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 30</pre>
 31<p>
 32        This facility provides a mechanism for lazily evaluating operators. Syntactically,
 33        a lazy operator looks and feels like an ordinary C/C++ infix, prefix or postfix
 34        operator. The operator application looks the same. However, unlike ordinary
 35        operators, the actual operator execution is deferred. Samples:
 36      </p>
 37<pre class="programlisting"><span class="identifier">arg1</span> <span class="special">+</span> <span class="identifier">arg2</span>
 38<span class="number">1</span> <span class="special">+</span> <span class="identifier">arg1</span> <span class="special">*</span> <span class="identifier">arg2</span>
 39<span class="number">1</span> <span class="special">/</span> <span class="special">-</span><span class="identifier">arg1</span>
 40<span class="identifier">arg1</span> <span class="special">&lt;</span> <span class="number">150</span>
 41</pre>
 42<p>
 43        We have seen the lazy operators in action (see <a class="link" href="../starter_kit/lazy_operators.html" title="Lazy Operators">Quick
 44        Start - Lazy Operators</a>). Let's go back and examine them a little bit
 45        further:
 46      </p>
 47<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">find_if</span><span class="special">(</span><span class="identifier">c</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">arg1</span> <span class="special">%</span> <span class="number">2</span> <span class="special">==</span> <span class="number">1</span><span class="special">)</span>
 48</pre>
 49<p>
 50        Through operator overloading, the expression <code class="computeroutput"><span class="identifier">arg1</span>
 51        <span class="special">%</span> <span class="number">2</span> <span class="special">==</span> <span class="number">1</span></code> actually
 52        generates an actor. This actor object is passed on to STL's <code class="computeroutput"><span class="identifier">find_if</span></code> function. From the viewpoint of
 53        STL, the expression is simply a function object expecting a single argument
 54        of the containers value_type. For each element in <code class="computeroutput"><span class="identifier">c</span></code>,
 55        the element is passed on as an argument <code class="computeroutput"><span class="identifier">arg1</span></code>
 56        to the actor (function object). The actor checks if this is an odd value
 57        based on the expression <code class="computeroutput"><span class="identifier">arg1</span> <span class="special">%</span> <span class="number">2</span> <span class="special">==</span>
 58        <span class="number">1</span></code> where arg1 is replaced by the container's
 59        element.
 60      </p>
 61<p>
 62        Like lazy functions (see <a class="link" href="function.html" title="Function">Function</a>),
 63        lazy operators are not immediately executed when invoked. Instead, an actor
 64        (see <a class="link" href="../actor.html" title="Actor">Actor</a>) object is created and returned
 65        to the caller. Example:
 66      </p>
 67<pre class="programlisting"><span class="special">(</span><span class="identifier">arg1</span> <span class="special">+</span> <span class="identifier">arg2</span><span class="special">)</span> <span class="special">*</span> <span class="identifier">arg3</span>
 68</pre>
 69<p>
 70        does nothing more than return an actor. A second function call will evaluate
 71        the actual operators. Example:
 72      </p>
 73<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="special">((</span><span class="identifier">arg1</span> <span class="special">+</span> <span class="identifier">arg2</span><span class="special">)</span> <span class="special">*</span> <span class="identifier">arg3</span><span class="special">)(</span><span class="number">4</span><span class="special">,</span> <span class="number">5</span><span class="special">,</span> <span class="number">6</span><span class="special">);</span>
 74</pre>
 75<p>
 76        will print out "54".
 77      </p>
 78<p>
 79        Operator expressions are lazily evaluated following four simple rules:
 80      </p>
 81<div class="orderedlist"><ol class="orderedlist" type="1">
 82<li class="listitem">
 83            A binary operator, except <code class="computeroutput"><span class="special">-&gt;*</span></code>
 84            will be lazily evaluated when <span class="emphasis"><em>at least</em></span> one of its
 85            operands is an actor object (see <a class="link" href="../actor.html" title="Actor">Actor</a>).
 86          </li>
 87<li class="listitem">
 88            Unary operators are lazily evaluated if their argument is an actor object.
 89          </li>
 90<li class="listitem">
 91            Operator <code class="computeroutput"><span class="special">-&gt;*</span></code> is lazily
 92            evaluated if the left hand argument is an actor object.
 93          </li>
 94<li class="listitem">
 95            The result of a lazy operator is an actor object that can in turn allow
 96            the applications of rules 1, 2 and 3.
 97          </li>
 98</ol></div>
 99<p>
100        For example, to check the following expression is lazily evaluated:
101      </p>
102<pre class="programlisting"><span class="special">-(</span><span class="identifier">arg1</span> <span class="special">+</span> <span class="number">3</span> <span class="special">+</span> <span class="number">6</span><span class="special">)</span>
103</pre>
104<div class="orderedlist"><ol class="orderedlist" type="1">
105<li class="listitem">
106            Following rule 1, <code class="computeroutput"><span class="identifier">arg1</span> <span class="special">+</span> <span class="number">3</span></code> is
107            lazily evaluated since <code class="computeroutput"><span class="identifier">arg1</span></code>
108            is an actor (see <a class="link" href="core/arguments.html" title="Arguments">Arguments</a>).
109          </li>
110<li class="listitem">
111            The result of this <code class="computeroutput"><span class="identifier">arg1</span> <span class="special">+</span> <span class="number">3</span></code> expression
112            is an actor object, following rule 4.
113          </li>
114<li class="listitem">
115            Continuing, <code class="computeroutput"><span class="identifier">arg1</span> <span class="special">+</span>
116            <span class="number">3</span> <span class="special">+</span> <span class="number">6</span></code> is again lazily evaluated. Rule 2.
117          </li>
118<li class="listitem">
119            By rule 4 again, the result of <code class="computeroutput"><span class="identifier">arg1</span>
120            <span class="special">+</span> <span class="number">3</span> <span class="special">+</span> <span class="number">6</span></code> is
121            an actor object.
122          </li>
123<li class="listitem">
124            As <code class="computeroutput"><span class="identifier">arg1</span> <span class="special">+</span>
125            <span class="number">3</span> <span class="special">+</span> <span class="number">6</span></code> is an actor, <code class="computeroutput"><span class="special">-(</span><span class="identifier">arg1</span> <span class="special">+</span> <span class="number">3</span> <span class="special">+</span> <span class="number">6</span><span class="special">)</span></code> is lazily evaluated. Rule 2.
126          </li>
127</ol></div>
128<p>
129        Lazy-operator application is highly contagious. In most cases, a single
130        <code class="computeroutput"><span class="identifier">argN</span></code> actor infects all its
131        immediate neighbors within a group (first level or parenthesized expression).
132      </p>
133<p>
134        Note that at least one operand of any operator must be a valid actor for
135        lazy evaluation to take effect. To force lazy evaluation of an ordinary expression,
136        we can use <code class="computeroutput"><span class="identifier">ref</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>, <code class="computeroutput"><span class="identifier">val</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code> or <code class="computeroutput"><span class="identifier">cref</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>
137        to transform an operand into a valid actor object (see <a class="link" href="core.html" title="Core">Core</a>).
138        For example:
139      </p>
140<pre class="programlisting"><span class="number">1</span> <span class="special">&lt;&lt;</span> <span class="number">3</span><span class="special">;</span>      <span class="comment">// Immediately evaluated
141</span><span class="identifier">val</span><span class="special">(</span><span class="number">1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="number">3</span><span class="special">;</span> <span class="comment">// Lazily evaluated
142</span></pre>
143<a name="phoenix.modules.operator.supported_operators"></a><h5>
144<a name="id815502"></a>
145        <a class="link" href="operator.html#phoenix.modules.operator.supported_operators">Supported operators</a>
146      </h5>
147<a name="phoenix.modules.operator.unary_operators"></a><h5>
148<a name="id815521"></a>
149        <a class="link" href="operator.html#phoenix.modules.operator.unary_operators">Unary operators</a>
150      </h5>
151<pre class="programlisting"><span class="identifier">prefix</span><span class="special">:</span>   <span class="special">~,</span> <span class="special">!,</span> <span class="special">-,</span> <span class="special">+,</span> <span class="special">++,</span> <span class="special">--,</span> <span class="special">&amp;</span> <span class="special">(</span><span class="identifier">reference</span><span class="special">),</span> <span class="special">*</span> <span class="special">(</span><span class="identifier">dereference</span><span class="special">)</span>
152<span class="identifier">postfix</span><span class="special">:</span>  <span class="special">++,</span> <span class="special">--</span>
153</pre>
154<a name="phoenix.modules.operator.binary_operators"></a><h5>
155<a name="id815652"></a>
156        <a class="link" href="operator.html#phoenix.modules.operator.binary_operators">Binary operators</a>
157      </h5>
158<pre class="programlisting"><span class="special">=,</span> <span class="special">[],</span> <span class="special">+=,</span> <span class="special">-=,</span> <span class="special">*=,</span> <span class="special">/=,</span> <span class="special">%=,</span> <span class="special">&amp;=,</span> <span class="special">|=,</span> <span class="special">^=,</span> <span class="special">&lt;&lt;=,</span> <span class="special">&gt;&gt;=</span>
159<span class="special">+,</span> <span class="special">-,</span> <span class="special">*,</span> <span class="special">/,</span> <span class="special">%,</span> <span class="special">&amp;,</span> <span class="special">|,</span> <span class="special">^,</span> <span class="special">&lt;&lt;,</span> <span class="special">&gt;&gt;</span>
160<span class="special">==,</span> <span class="special">!=,</span> <span class="special">&lt;,</span> <span class="special">&gt;,</span> <span class="special">&lt;=,</span> <span class="special">&gt;=</span>
161<span class="special">&amp;&amp;,</span> <span class="special">||,</span> <span class="special">-&gt;*</span>
162</pre>
163<a name="phoenix.modules.operator.ternary_operator"></a><h5>
164<a name="id815853"></a>
165        <a class="link" href="operator.html#phoenix.modules.operator.ternary_operator">Ternary operator</a>
166      </h5>
167<pre class="programlisting"><span class="identifier">if_else</span><span class="special">(</span><span class="identifier">c</span><span class="special">,</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span><span class="special">)</span>
168</pre>
169<p>
170        The ternary operator deserves special mention. Since C++ does not allow us
171        to overload the conditional expression: <code class="computeroutput"><span class="identifier">c</span>
172        <span class="special">?</span> <span class="identifier">a</span> <span class="special">:</span> <span class="identifier">b</span></code>, the
173        if_else pseudo function is provided for this purpose. The behavior is identical,
174        albeit in a lazy manner.
175      </p>
176<a name="phoenix.modules.operator.member_pointer_operator"></a><h5>
177<a name="id815954"></a>
178        <a class="link" href="operator.html#phoenix.modules.operator.member_pointer_operator">Member pointer
179        operator</a>
180      </h5>
181<pre class="programlisting"><span class="identifier">a</span><span class="special">-&gt;*</span><span class="identifier">member_object_pointer</span>
182<span class="identifier">a</span><span class="special">-&gt;*</span><span class="identifier">member_function_pointer</span>
183</pre>
184<p>
185        The left hand side of the member pointer operator must be an actor returning
186        a pointer type. The right hand side of the member pointer operator may be
187        either a pointer to member object or pointer to member function.
188      </p>
189<p>
190        If the right hand side is a member object pointer, the result is an actor
191        which, when evaluated, returns a reference to that member. For example:
192      </p>
193<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">A</span>
194<span class="special">{</span>
195    <span class="keyword">int</span> <span class="identifier">member</span><span class="special">;</span>
196<span class="special">};</span>
197
198<span class="identifier">A</span><span class="special">*</span> <span class="identifier">a</span> <span class="special">=</span> <span class="keyword">new</span> <span class="identifier">A</span><span class="special">;</span>
199<span class="special">...</span>
200
201<span class="special">(</span><span class="identifier">arg1</span><span class="special">-&gt;*&amp;</span><span class="identifier">A</span><span class="special">::</span><span class="identifier">member</span><span class="special">)(</span><span class="identifier">a</span><span class="special">);</span> <span class="comment">// returns member a-&gt;member
202</span></pre>
203<p>
204        If the right hand side is a member function pointer, the result is an actor
205        which, when invoked, calls the specified member function. For example:
206      </p>
207<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">A</span>
208<span class="special">{</span>
209    <span class="keyword">int</span> <span class="identifier">func</span><span class="special">(</span><span class="keyword">int</span><span class="special">);</span>
210<span class="special">};</span>
211
212<span class="identifier">A</span><span class="special">*</span> <span class="identifier">a</span> <span class="special">=</span> <span class="keyword">new</span> <span class="identifier">A</span><span class="special">;</span>
213<span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
214
215<span class="special">(</span><span class="identifier">arg1</span><span class="special">-&gt;*&amp;</span><span class="identifier">A</span><span class="special">::</span><span class="identifier">func</span><span class="special">)(</span><span class="identifier">arg2</span><span class="special">)(</span><span class="identifier">a</span><span class="special">,</span> <span class="identifier">i</span><span class="special">);</span> <span class="comment">// returns a-&gt;func(i)
216</span></pre>
217<a name="phoenix.modules.operator.include_files"></a><h5>
218<a name="id816335"></a>
219        <a class="link" href="operator.html#phoenix.modules.operator.include_files">Include Files</a>
220      </h5>
221<div class="informaltable"><table class="table">
222<colgroup>
223<col>
224<col>
225</colgroup>
226<thead><tr>
227<th>
228                <p>
229                  Operators
230                </p>
231              </th>
232<th>
233                <p>
234                  File
235                </p>
236              </th>
237</tr></thead>
238<tbody>
239<tr>
240<td>
241                <p>
242                  <code class="computeroutput"><span class="special">-</span></code>, <code class="computeroutput"><span class="special">+</span></code>,
243                  <code class="computeroutput"><span class="special">++</span></code>, <code class="computeroutput"><span class="special">--</span></code>, <code class="computeroutput"><span class="special">+=</span></code>,
244                  <code class="computeroutput"><span class="special">-=</span></code>, <code class="computeroutput"><span class="special">*=</span></code>, <code class="computeroutput"><span class="special">/=</span></code>,
245                  <code class="computeroutput"><span class="special">%=</span></code>, <code class="computeroutput"><span class="special">*</span></code>, <code class="computeroutput"><span class="special">/</span></code>,
246                  <code class="computeroutput"><span class="special">%</span></code>
247                </p>
248              </td>
249<td>
250                <p>
251                  <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">/</span><span class="identifier">arithmetic</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
252                </p>
253              </td>
254</tr>
255<tr>
256<td>
257                <p>
258                  <code class="computeroutput"><span class="special">&amp;=</span></code>, <code class="computeroutput"><span class="special">|=</span></code>, <code class="computeroutput"><span class="special">^=</span></code>,
259                  <code class="computeroutput"><span class="special">&lt;&lt;=</span></code>, <code class="computeroutput"><span class="special">&gt;&gt;=</span></code>, <code class="computeroutput"><span class="special">&amp;</span></code>,
260                  <code class="computeroutput"><span class="special">|</span></code>, <code class="computeroutput"><span class="special">^</span></code>,
261                  <code class="computeroutput"><span class="special">&lt;&lt;</span></code>, <code class="computeroutput"><span class="special">&gt;&gt;</span></code>
262                </p>
263              </td>
264<td>
265                <p>
266                  <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">/</span><span class="identifier">bitwise</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
267                </p>
268              </td>
269</tr>
270<tr>
271<td>
272                <p>
273                  <code class="computeroutput"><span class="special">==</span></code>, <code class="computeroutput"><span class="special">!=</span></code>, <code class="computeroutput"><span class="special">&lt;</span></code>,
274                  <code class="computeroutput"><span class="special">&lt;=</span></code>, <code class="computeroutput"><span class="special">&gt;</span></code>, <code class="computeroutput"><span class="special">&gt;=</span></code>
275                </p>
276              </td>
277<td>
278                <p>
279                  <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">/</span><span class="identifier">comparison</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
280                </p>
281              </td>
282</tr>
283<tr>
284<td>
285                <p>
286                  <code class="computeroutput"><span class="special">&lt;&lt;</span></code>, <code class="computeroutput"><span class="special">&gt;&gt;</span></code>
287                </p>
288              </td>
289<td>
290                <p>
291                  <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">/</span><span class="identifier">io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
292                </p>
293              </td>
294</tr>
295<tr>
296<td>
297                <p>
298                  <code class="computeroutput"><span class="special">!</span></code>, &amp;&amp;, <code class="computeroutput"><span class="special">||</span></code>
299                </p>
300              </td>
301<td>
302                <p>
303                  <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">/</span><span class="identifier">logical</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
304                </p>
305              </td>
306</tr>
307<tr>
308<td>
309                <p>
310                  <code class="computeroutput"><span class="special">&amp;</span><span class="identifier">x</span></code>,
311                  <code class="computeroutput"><span class="special">*</span><span class="identifier">p</span></code>,
312                  <code class="computeroutput"><span class="special">=</span></code>, <code class="computeroutput"><span class="special">[]</span></code>
313                </p>
314              </td>
315<td>
316                <p>
317                  <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">/</span><span class="identifier">self</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
318                </p>
319              </td>
320</tr>
321<tr>
322<td>
323                <p>
324                  <code class="computeroutput"><span class="identifier">if_else</span><span class="special">(</span><span class="identifier">c</span><span class="special">,</span>
325                  <span class="identifier">a</span><span class="special">,</span>
326                  <span class="identifier">b</span><span class="special">)</span></code>
327                </p>
328              </td>
329<td>
330                <p>
331                  <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">/</span><span class="identifier">if_else</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
332                </p>
333              </td>
334</tr>
335<tr>
336<td>
337                <p>
338                  <code class="computeroutput"><span class="special">-&gt;*</span></code>
339                </p>
340              </td>
341<td>
342                <p>
343                  <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="keyword">operator</span><span class="special">/</span><span class="identifier">member</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
344                </p>
345              </td>
346</tr>
347</tbody>
348</table></div>
349</div>
350<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
351<td align="left"></td>
352<td align="right"><div class="copyright-footer">Copyright &#169; 2002-2005, 2010 Joel de Guzman, Dan Marsden, Thomas Heller<p>
353        Distributed under the Boost Software License, Version 1.0. (See accompanying
354        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>)
355      </p>
356</div></td>
357</tr></table>
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