In common.h, define func_lib for function objects. In configure.ac, define HAVE_STD_FUNCTION and HAVE_BOOST_FUNCTION. Include function headers in ndnboost.
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+
+ <h1>Function Object Traits</h1>
+
+ <p>The header <a href="../../boost/functional.hpp">functional.hpp</a>
+ provides two traits class templates for functions and function objects:</p>
+
+ <table border="1" summary="">
+ <tr>
+ <th>Type</th>
+
+ <th>Contents</th>
+
+ <th>Description</th>
+ </tr>
+
+ <tr>
+ <td valign="top" rowspan="4">
+ <tt>template <typename T><br>
+ struct unary_traits</tt></td>
+
+ <td valign="top"><tt>function_type</tt></td>
+
+ <td valign="top">The type of the function or function object itself
+ (i.e., <tt>T</tt>).</td>
+ </tr>
+
+ <tr>
+ <td valign="top"><tt>param_type</tt></td>
+
+ <td valign="top">The type that should be used to pass the function or
+ function object as a parameter.</td>
+ </tr>
+
+ <tr>
+ <td valign="top"><tt>result_type</tt></td>
+
+ <td valign="top">The type returned by the function or function
+ object.</td>
+ </tr>
+
+ <tr>
+ <td valign="top"><tt>argument_type</tt></td>
+
+ <td valign="top">The type of the argument to the function or function
+ object.</td>
+ </tr>
+
+ <tr>
+ <td valign="top" rowspan="5">
+ <tt>template <typename T><br>
+ struct binary_traits</tt></td>
+
+ <td valign="top"><tt>function_type</tt></td>
+
+ <td valign="top">The type of the function or function object itself
+ (i.e., <tt>T</tt>).</td>
+ </tr>
+
+ <tr>
+ <td valign="top"><tt>param_type</tt></td>
+
+ <td valign="top">The type that should be used to pass the function or
+ function object as a parameter.</td>
+ </tr>
+
+ <tr>
+ <td valign="top"><tt>result_type</tt></td>
+
+ <td valign="top">The type returned by the function or function
+ object.</td>
+ </tr>
+
+ <tr>
+ <td valign="top"><tt>first_argument_type</tt></td>
+
+ <td valign="top">The type of the first argument to the function or
+ function object.</td>
+ </tr>
+
+ <tr>
+ <td valign="top"><tt>second_argument_type</tt></td>
+
+ <td valign="top">The type of the second argument to the function or
+ function object.</td>
+ </tr>
+ </table>
+
+ <h3>Usage</h3>
+
+ <p><tt>unary_traits</tt> should be instantiated with either a function
+ taking a single parameter, or an adaptable unary function object (i.e., a
+ class derived from <tt>std::unary_function</tt> or one which provides the
+ same typedefs). (See §20.3.1 in the C++ Standard.)</p>
+
+ <p><tt>binary_traits</tt> should be instantiated with either a function
+ taking two parameters, or an adaptable binary function object (i.e., a
+ class derived from <tt>std::binary_function</tt> or one which provides the
+ same typedefs). (See §20.3.1 in the C++ Standard.)</p>
+
+ <p>The most common usage of these templates is in function object adapters,
+ thus allowing them to adapt plain functions as well as function objects.
+ You can do this by wherever you would normally write, for example,</p>
+
+ <blockquote>
+ <pre>
+typename Operation::argument_type
+</pre>
+ </blockquote>
+
+ <p>simply writing</p>
+
+ <blockquote>
+ <pre>
+typename boost::unary_traits<Operation>::argument_type
+</pre>
+ </blockquote>
+
+ <p>instead.</p>
+
+ <h3>Additional Types Defined</h3>
+
+ <p>In addition to the standard result and argument typedefs, these traits
+ templates define two additional types.</p>
+
+ <h4><tt>function_type</tt></h4>
+
+ <p>This is the type of the function or function object, and can be used in
+ declarations such as</p>
+
+ <blockquote>
+ <pre>
+template <class Predicate>
+class unary_negate : // ...
+{
+ // ...
+ private:
+ <strong>typename unary_traits<Predicate>::function_type</strong> pred;
+};
+</pre>
+ </blockquote>
+
+ <p>If this typedef were not provided, it would not be possible to declare
+ <tt>pred</tt> in a way that would allow <tt>unary_negate</tt> to be
+ instantiated with a function type (see the C++ Standard §14.3.1
+ ¶3).</p>
+
+ <h4><tt>param_type</tt></h4>
+
+ <p>This is a type suitable for passing the function or function object as a
+ parameter to another function. For example,</p>
+
+ <blockquote>
+ <pre>
+template <class Predicate>
+class unary_negate : // ...
+{
+ public:
+ explicit unary_negate(<strong>typename unary_traits<Predicate>::param_type</strong> x)
+ :
+ pred(x)
+ {}
+ // ...
+};
+</pre>
+ </blockquote>
+
+ <p>Function objects are passed by reference to const; function pointers are
+ passed by value.</p>
+
+ <h3>Limitations</h3>
+
+ <p>This library uses these traits within all function object adapters,
+ theoretically rendering <tt>ptr_fun</tt> obsolete. However, third party
+ adapters probably won't take advantage of this mechanism, and so
+ <tt>ptr_fun</tt> may still be required. Accordingly, this library also
+ provides <a href="ptr_fun.html">improved versions of the standard function
+ pointer adapters</a>.</p>
+
+ <p>These traits templates will also not work with compilers that fail to
+ support partial specialisation of templates. With these compilers, the
+ traits templates can only be instantiated with adaptable function objects,
+ thus requiring <tt>ptr_fun</tt> to be used, even with the function object
+ adapters in this library.</p>
+ <hr>
+
+ <p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
+ "../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
+ height="31" width="88"></a></p>
+
+ <p>Revised
+ <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->02
+ December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38510" --></p>
+
+ <p><i>Copyright © 2000 Cadenza New Zealand Ltd.</i></p>
+
+ <p><i>Distributed under the Boost Software License, Version 1.0. (See
+ accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
+ copy at <a href=
+ "http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
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