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| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="phoenix.lazy_list.implementation_details"></a><a class="link" href="implementation_details.html" title="Implementation Details">Implementation |
| Details</a> |
| </h3></div></div></div> |
| <h3> |
| <a name="phoenix.lazy_list.implementation_details.h0"></a> |
| <span class="phrase"><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> |
| </h3> |
| <p> |
| 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++ |
| List Implementation</a> is a carefully crafted code which allows for |
| efficient processing of a number of different cases. In particular it makes |
| use of the <a href="http://people.cs.umass.edu/~yannis/fc++/New/reusers.html" target="_top">FC++ |
| Reuser Implementation</a> for processing of repetitive evaluations. |
| </p> |
| <p> |
| <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> uses a combination |
| of polymorphic and single type functions which can be passed as arguments |
| to other functions. |
| </p> |
| <p> |
| The implementation of list<T> has needed new implementations of the |
| strategy using the facilities of Boost Phoenix and also Boost Function. It |
| turns out that a combination of both can be used to meet the needs of list<T>. |
| </p> |
| <p> |
| The fact that the functions are defined by boost::phoenix::function means |
| that they work with phoenix arguments such as 'arg1'. This is the fact which |
| ensures the flexibility needed for the user to build new functions as needed. |
| </p> |
| <h3> |
| <a name="phoenix.lazy_list.implementation_details.h1"></a> |
| <span class="phrase"><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> |
| </h3> |
| <p> |
| The <a href="http://people.cs.umass.edu/~yannis/fc++/New/new_list_implementation.html" target="_top">FC++ |
| List Implementation</a> and the <a href="http://people.cs.umass.edu/~yannis/fc++/New/reusers.html" target="_top">FC++ |
| Reuser Implementation</a> have been followed very closely in building |
| this code. The version used as the starting point was the <a href="http://cgi.di.uoa.gr/~smaragd/fc++/boostpaper/" target="_top">Boost |
| FC++</a> version. |
| </p> |
| <h3> |
| <a name="phoenix.lazy_list.implementation_details.h2"></a> |
| <span class="phrase"><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 |
| Function Types</a> |
| </h3> |
| <p> |
| Functions are implemented as a struct within namespace impl. For an example |
| funcion 'x' the type is defined like this: |
| </p> |
| <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> |
| <span class="identifier">X</span> <span class="identifier">x</span> |
| </pre> |
| <p> |
| This alternative will work to provide a function 'x' but it is not then possible |
| to pass it as an argument. |
| </p> |
| <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> |
| </pre> |
| <h4> |
| <a name="phoenix.lazy_list.implementation_details.h3"></a> |
| <span class="phrase"><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 |
| Example</a> |
| </h4> |
| <p> |
| This example implements id() which simply returns its argument: |
| </p> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">impl</span> <span class="special">{</span> |
| |
| <span class="keyword">struct</span> <span class="identifier">Id</span> |
| <span class="special">{</span> |
| <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> |
| |
| <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> |
| <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> |
| <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> |
| <span class="special">{};</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">></span> |
| <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> |
| <span class="special">{</span> |
| <span class="keyword">return</span> <span class="identifier">a0</span><span class="special">;</span> |
| <span class="special">}</span> |
| |
| <span class="special">};</span> |
| |
| <span class="special">}</span> |
| |
| <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> |
| <span class="identifier">Id</span> <span class="identifier">id</span><span class="special">;</span> |
| </pre> |
| <h3> |
| <a name="phoenix.lazy_list.implementation_details.h4"></a> |
| <span class="phrase"><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 |
| with defined return type</a> |
| </h3> |
| <p> |
| Sometimes it is necessary to define a function using a templated struct, |
| where the template parameter type defines the return type. |
| </p> |
| <h4> |
| <a name="phoenix.lazy_list.implementation_details.h5"></a> |
| <span class="phrase"><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 |
| with one argument</a> |
| </h4> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">impl</span> <span class="special">{</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Result</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">what</span> <span class="special">{</span> |
| |
| <span class="keyword">typedef</span> <span class="identifier">Result</span> <span class="identifier">result_type</span><span class="special">;</span> |
| |
| <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> |
| <span class="special">{</span> |
| <span class="keyword">return</span> <span class="identifier">r</span><span class="special">;</span> |
| <span class="special">}</span> |
| <span class="special">};</span> |
| |
| <span class="special">}</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">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> |
| <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> |
| <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> |
| <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> |
| </pre> |
| <h4> |
| <a name="phoenix.lazy_list.implementation_details.h6"></a> |
| <span class="phrase"><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 |
| with zero arguments</a> |
| </h4> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">impl</span> <span class="special">{</span> |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Result</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">what0</span> <span class="special">{</span> |
| |
| <span class="keyword">typedef</span> <span class="identifier">Result</span> <span class="identifier">result_type</span><span class="special">;</span> |
| |
| <span class="identifier">Result</span> <span class="keyword">operator</span><span class="special">()()</span> <span class="keyword">const</span> |
| <span class="special">{</span> |
| <span class="keyword">return</span> <span class="identifier">Result</span><span class="special">(</span><span class="number">100</span><span class="special">);</span> |
| <span class="special">}</span> |
| |
| <span class="special">};</span> |
| <span class="special">}</span> |
| |
| <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> |
| <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> |
| <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> |
| <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> |
| </pre> |
| <h3> |
| <a name="phoenix.lazy_list.implementation_details.h7"></a> |
| <span class="phrase"><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 |
| Generation Implementation</a> |
| </h3> |
| <p> |
| The implementation of the function |
| </p> |
| <pre class="programlisting"><span class="identifier">enum_from</span><span class="special">(</span><span class="number">1</span><span class="special">)</span> |
| </pre> |
| <p> |
| requires a functor which will evaluate the successive numbers on demand. |
| The code from <a href="http://cgi.di.uoa.gr/~smaragd/fc++/" target="_top">FC++</a> |
| has been reimplemented using internal functors as follows. |
| </p> |
| <p> |
| This code has to carefully manipulate the input type T to construct the result |
| type which is a list. |
| </p> |
| <p> |
| The code in EFH is used to build a series of objects which each add one element |
| to the list and return the function which will add the next element. That |
| only gets called when it is needed. |
| </p> |
| <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> |
| <span class="keyword">struct</span> <span class="identifier">EFH</span> |
| <span class="special">{</span> |
| <span class="keyword">mutable</span> <span class="identifier">T</span> <span class="identifier">x</span><span class="special">;</span> |
| <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> |
| <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> |
| |
| <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> |
| <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> |
| <span class="special">{</span> |
| <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> |
| <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> |
| <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> |
| <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> |
| <span class="special">};</span> |
| <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> |
| <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> |
| <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> |
| <span class="identifier">delay_result_type</span> <span class="identifier">result_type</span><span class="special">;</span> |
| <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> |
| <span class="special">++</span><span class="identifier">x</span><span class="special">;</span> |
| <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> |
| <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> |
| <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> |
| <span class="preprocessor">#ifndef</span> <span class="identifier">BOOST_PHOENIX_NO_LAZY_EXCEPTIONS</span> |
| <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> |
| <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> |
| <span class="preprocessor">#endif</span> |
| <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> |
| <span class="special">}</span> |
| <span class="special">};</span> |
| |
| <span class="keyword">struct</span> <span class="identifier">Enum_from</span> <span class="special">{</span> |
| <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> |
| |
| <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> |
| <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> |
| <span class="special">{</span> |
| <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> |
| <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> |
| <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> |
| <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> |
| <span class="identifier">delay_result_type</span> <span class="identifier">type</span><span class="special">;</span> |
| <span class="special">};</span> |
| |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> |
| <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> |
| <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> |
| <span class="special">{</span> |
| <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> |
| <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> |
| <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> |
| <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> |
| <span class="identifier">delay_result_type</span> <span class="identifier">result_type</span><span class="special">;</span> |
| <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> |
| <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> |
| <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> |
| <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> |
| <span class="comment">//std::cout << "enum_from (" << x << ")" << std::endl;</span> |
| <span class="keyword">return</span> <span class="identifier">efh_R_T</span><span class="special">();</span> |
| <span class="special">}</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| Similar code is used in the related functors |
| </p> |
| <pre class="programlisting"><span class="identifier">enum_from_to</span> |
| <span class="identifier">filter</span> |
| </pre> |
| <h3> |
| <a name="phoenix.lazy_list.implementation_details.h8"></a> |
| <span class="phrase"><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> |
| </h3> |
| <p> |
| These implementation mechanisms have been carried through consistently in |
| the implementation. |
| </p> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas |
| Heller, John Fletcher<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
| </p> |
| </div></td> |
| </tr></table> |
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