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27<a name="boost_convert.supporting_tools.boost_declare_is_callable"></a><a class="link" href="boost_declare_is_callable.html" title="BOOST_DECLARE_IS_CALLABLE">BOOST_DECLARE_IS_CALLABLE</a>
28</h3></div></div></div>
29<p>
30        The BOOST_DECLARE_IS_CALLABLE macro extends the functionality provided by
31        BOOST_DECLARE_HAS_MEMBER and allows to declare a trait which would then let
32        introspect the existence of a named class member function <span class="emphasis"><em>callable
33        with the supplied signature</em></span>.
34      </p>
35<p>
36        For example, the following declarations introduce <code class="computeroutput"><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span></code>
37        and <code class="computeroutput"><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span></code> traits:
38      </p>
39<p>
40</p>
41<pre class="programlisting"><span class="keyword">namespace</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">local</span>
42<span class="special">{</span>
43    <span class="identifier">BOOST_DECLARE_IS_CALLABLE</span><span class="special">(</span><span class="identifier">can_call_funop</span><span class="special">,</span> <span class="keyword">operator</span><span class="special">());</span>
44    <span class="identifier">BOOST_DECLARE_IS_CALLABLE</span><span class="special">(</span><span class="identifier">can_call_func</span><span class="special">,</span> <span class="identifier">func</span><span class="special">);</span>
45<span class="special">}}</span>
46</pre>
47<p>
48      </p>
49<p>
50        The traits allow to test if the supplied class has respectively <code class="computeroutput"><span class="keyword">operator</span><span class="special">()</span></code>
51        and <code class="computeroutput"><span class="identifier">func</span><span class="special">()</span></code>
52        member functions callable with the specified signature:
53      </p>
54<p>
55</p>
56<pre class="programlisting"><span class="keyword">namespace</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">callable</span>
57<span class="special">{</span>
58    <span class="keyword">struct</span>  <span class="identifier">test1</span> <span class="special">{</span> <span class="keyword">int</span>  <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> <span class="special">}};</span>
59    <span class="keyword">struct</span>  <span class="identifier">test2</span> <span class="special">{</span> <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)</span> <span class="special">{}};</span>
60    <span class="keyword">struct</span>  <span class="identifier">test3</span> <span class="special">{</span> <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">{}};</span>
61    <span class="keyword">struct</span>  <span class="identifier">test4</span> <span class="special">{</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">int</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">();</span> <span class="special">}};</span>
62    <span class="keyword">struct</span>  <span class="identifier">test5</span> <span class="special">{</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="special">=</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">())</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">();</span> <span class="special">}};</span>
63    <span class="keyword">struct</span>  <span class="identifier">test6</span> <span class="special">{</span> <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">();</span> <span class="special">}};</span>
64    <span class="keyword">struct</span>  <span class="identifier">test7</span> <span class="special">{</span> <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="identifier">T</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span><span class="special">)</span> <span class="keyword">const</span>  <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">T</span><span class="special">();</span> <span class="special">}};</span>
65
66    <span class="keyword">struct</span>  <span class="identifier">test11</span> <span class="special">{</span> <span class="keyword">int</span>  <span class="identifier">func</span><span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> <span class="special">}};</span>
67    <span class="keyword">struct</span>  <span class="identifier">test12</span> <span class="special">{</span> <span class="keyword">void</span> <span class="identifier">func</span><span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)</span> <span class="special">{}};</span>
68    <span class="keyword">struct</span>  <span class="identifier">test13</span> <span class="special">{</span> <span class="keyword">void</span> <span class="identifier">func</span><span class="special">(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">{}};</span>
69    <span class="keyword">struct</span>  <span class="identifier">test14</span> <span class="special">{</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">func</span><span class="special">(</span><span class="keyword">int</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">();</span> <span class="special">}};</span>
70    <span class="keyword">struct</span>  <span class="identifier">test15</span> <span class="special">{</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">func</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="special">=</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">())</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">();</span> <span class="special">}};</span>
71    <span class="keyword">struct</span>  <span class="identifier">test16</span> <span class="special">{</span> <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">func</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">();</span> <span class="special">}};</span>
72    <span class="keyword">struct</span>  <span class="identifier">test17</span> <span class="special">{</span> <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span> <span class="identifier">T</span> <span class="identifier">func</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">T</span><span class="special">();</span> <span class="special">}};</span>
73<span class="special">}}</span>
74</pre>
75<p>
76      </p>
77<p>
78</p>
79<pre class="programlisting"><span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test1</span><span class="special">,</span> <span class="keyword">int</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
80<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test1</span><span class="special">,</span> <span class="keyword">double</span> <span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
81<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test1</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
82<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test1</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
83<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test1</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
84<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test1</span><span class="special">,</span> <span class="keyword">int</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">int</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">false</span><span class="special">));</span>
85<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test1</span><span class="special">,</span> <span class="keyword">int</span> <span class="special">(</span><span class="keyword">double</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">false</span><span class="special">));</span>
86
87<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test2</span><span class="special">,</span> <span class="keyword">int</span>  <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">false</span><span class="special">));</span>
88<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test2</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
89<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test2</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span>   <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
90<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_funop</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test2</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span>   <span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
91</pre>
92<p>
93      </p>
94<p>
95</p>
96<pre class="programlisting"><span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test11</span><span class="special">,</span> <span class="keyword">int</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
97<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test11</span><span class="special">,</span> <span class="keyword">double</span> <span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
98<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test11</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
99<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test11</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
100<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test11</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
101<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test11</span><span class="special">,</span> <span class="keyword">int</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">int</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">false</span><span class="special">));</span>
102<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test11</span><span class="special">,</span> <span class="keyword">int</span> <span class="special">(</span><span class="keyword">double</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">false</span><span class="special">));</span>
103
104<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test12</span><span class="special">,</span> <span class="keyword">int</span>  <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">false</span><span class="special">));</span>
105<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test12</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span><span class="keyword">double</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
106<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test12</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span>   <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
107<span class="identifier">BOOST_TEST</span><span class="special">((</span><span class="identifier">local</span><span class="special">::</span><span class="identifier">can_call_func</span><span class="special">&lt;</span><span class="identifier">callable</span><span class="special">::</span><span class="identifier">test12</span><span class="special">,</span> <span class="keyword">void</span> <span class="special">(</span>   <span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span> <span class="keyword">const</span><span class="special">*)&gt;::</span><span class="identifier">value</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">));</span>
108</pre>
109<p>
110      </p>
111<p>
112        As it can be seen from the example the traits check for the existence of
113        a <span class="emphasis"><em>callable</em></span> member function but <span class="emphasis"><em>not necessarily
114        of the specified signature</em></span>. Please check the <span class="emphasis"><em>Boost.TTI</em></span>
115        library for the latter.
116      </p>
117</div>
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120<td align="right"><div class="copyright-footer">Copyright © 2009-2016 Vladimir Batov<p>
121        Distributed under the Boost Software License, Version 1.0. See copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>.
122      </p>
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