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<h1>boost/geometry/algorithms/buffer.hpp</h1><a href="buffer_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Boost.Geometry (aka GGL, Generic Geometry Library)</span>
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<a name="l00002"></a>00002 <span class="comment">//</span>
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<a name="l00003"></a>00003 <span class="comment">// Copyright Barend Gehrels 2007-2009, Geodan, Amsterdam, the Netherlands.</span>
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<a name="l00004"></a>00004 <span class="comment">// Copyright Bruno Lalande 2008, 2009</span>
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<a name="l00005"></a>00005 <span class="comment">// Use, modification and distribution is subject to the Boost Software License,</span>
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<a name="l00006"></a>00006 <span class="comment">// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
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<a name="l00007"></a>00007 <span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span>
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<a name="l00008"></a>00008
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<a name="l00009"></a>00009 <span class="preprocessor">#ifndef BOOST_GEOMETRY_ALGORITHMS_BUFFER_HPP</span>
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<a name="l00010"></a>00010 <span class="preprocessor"></span><span class="preprocessor">#define BOOST_GEOMETRY_ALGORITHMS_BUFFER_HPP</span>
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<a name="l00011"></a>00011 <span class="preprocessor"></span>
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<a name="l00012"></a>00012 <span class="preprocessor">#include <cstddef></span>
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<a name="l00013"></a>00013
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<a name="l00014"></a>00014 <span class="preprocessor">#include <boost/numeric/conversion/cast.hpp></span>
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<a name="l00015"></a>00015
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<a name="l00016"></a>00016 <span class="preprocessor">#include <<a class="code" href="geometries_2concepts_2check_8hpp.html">boost/geometry/geometries/concepts/check.hpp</a>></span>
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<a name="l00017"></a>00017
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<a name="l00018"></a>00018 <span class="preprocessor">#include <<a class="code" href="arithmetic_8hpp.html">boost/geometry/arithmetic/arithmetic.hpp</a>></span>
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<a name="l00019"></a>00019
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<a name="l00029"></a>00029 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>geometry
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<a name="l00030"></a>00030 {
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<a name="l00031"></a>00031
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<a name="l00032"></a>00032 <span class="preprocessor">#ifndef DOXYGEN_NO_DETAIL</span>
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<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="keyword">namespace </span>detail { <span class="keyword">namespace </span><a class="code" href="group__buffer.html#gc9330cc842e4cdb3669e1ebe42bf94d4" title="Calculate buffer (= new geometry) around specified distance of geometry.">buffer</a> {
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<a name="l00034"></a>00034
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<a name="l00035"></a>00035 <span class="keyword">template</span> <<span class="keyword">typename</span> BoxIn, <span class="keyword">typename</span> BoxOut, <span class="keyword">typename</span> T, std::<span class="keywordtype">size_t</span> C, std::<span class="keywordtype">size_t</span> D, std::<span class="keywordtype">size_t</span> N>
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<a name="l00036"></a>00036 <span class="keyword">struct </span>box_loop
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<a name="l00037"></a>00037 {
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<a name="l00038"></a>00038 <span class="keyword">typedef</span> <span class="keyword">typename</span> coordinate_type<BoxOut>::type coordinate_type;
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<a name="l00039"></a>00039
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<a name="l00040"></a>00040 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(BoxIn <span class="keyword">const</span>& box_in, T <span class="keyword">const</span>& <a class="code" href="group__distance.html#g8fb8022d64a75b24c80a64ba46ec4738" title="Calculate distance between two geometries with a specified strategy.">distance</a>, BoxOut& box_out)
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<a name="l00041"></a>00041 {
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<a name="l00042"></a>00042 set<C, D>(box_out, boost::numeric_cast<coordinate_type>(get<C, D>(box_in) + distance));
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<a name="l00043"></a>00043 box_loop<BoxIn, BoxOut, T, C, D + 1, N>::apply(box_in, <a class="code" href="group__distance.html#g8fb8022d64a75b24c80a64ba46ec4738" title="Calculate distance between two geometries with a specified strategy.">distance</a>, box_out);
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<a name="l00044"></a>00044 }
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<a name="l00045"></a>00045 };
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<a name="l00046"></a>00046
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<a name="l00047"></a>00047 <span class="keyword">template</span> <<span class="keyword">typename</span> BoxIn, <span class="keyword">typename</span> BoxOut, <span class="keyword">typename</span> T, std::<span class="keywordtype">size_t</span> C, std::<span class="keywordtype">size_t</span> N>
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<a name="l00048"></a>00048 <span class="keyword">struct </span>box_loop<BoxIn, BoxOut, T, C, N, N>
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<a name="l00049"></a>00049 {
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<a name="l00050"></a>00050 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(BoxIn <span class="keyword">const</span>&, T <span class="keyword">const</span>&, BoxOut&) {}
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<a name="l00051"></a>00051 };
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<a name="l00052"></a>00052
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<a name="l00053"></a>00053 <span class="comment">// Extends a box with the same amount in all directions</span>
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<a name="l00054"></a>00054 <span class="keyword">template</span><<span class="keyword">typename</span> BoxIn, <span class="keyword">typename</span> BoxOut, <span class="keyword">typename</span> T>
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<a name="l00055"></a>00055 <span class="keyword">inline</span> <span class="keywordtype">void</span> buffer_box(BoxIn <span class="keyword">const</span>& box_in, T <span class="keyword">const</span>& <a class="code" href="group__distance.html#g8fb8022d64a75b24c80a64ba46ec4738" title="Calculate distance between two geometries with a specified strategy.">distance</a>, BoxOut& box_out)
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<a name="l00056"></a>00056 {
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<a name="l00057"></a>00057 assert_dimension_equal<BoxIn, BoxOut>();
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<a name="l00058"></a>00058
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<a name="l00059"></a>00059 <span class="keyword">static</span> <span class="keyword">const</span> std::size_t N = <a class="code" href="classcore__dispatch_1_1dimension.html">dimension<BoxIn>::value</a>;
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<a name="l00060"></a>00060
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<a name="l00061"></a>00061 box_loop<BoxIn, BoxOut, T, min_corner, 0, N>::apply(box_in, -distance, box_out);
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<a name="l00062"></a>00062 box_loop<BoxIn, BoxOut, T, max_corner, 0, N>::apply(box_in, +distance, box_out);
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<a name="l00063"></a>00063 }
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<a name="l00064"></a>00064
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<a name="l00065"></a>00065 }} <span class="comment">// namespace detail::buffer</span>
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<a name="l00066"></a>00066 <span class="preprocessor">#endif // DOXYGEN_NO_DETAIL</span>
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<a name="l00067"></a>00067 <span class="preprocessor"></span>
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<a name="l00068"></a>00068 <span class="preprocessor">#ifndef DOXYGEN_NO_DISPATCH</span>
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<a name="l00069"></a>00069 <span class="preprocessor"></span><span class="keyword">namespace </span>dispatch
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<a name="l00070"></a>00070 {
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<a name="l00071"></a>00071
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<a name="l00072"></a>00072 <span class="keyword">template</span> <<span class="keyword">typename</span> TagIn, <span class="keyword">typename</span> TagOut, <span class="keyword">typename</span> Input, <span class="keyword">typename</span> T, <span class="keyword">typename</span> Output>
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<a name="l00073"></a>00073 <span class="keyword">struct </span><a class="code" href="group__buffer.html#gc9330cc842e4cdb3669e1ebe42bf94d4" title="Calculate buffer (= new geometry) around specified distance of geometry.">buffer</a> {};
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<a name="l00074"></a>00074
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<a name="l00075"></a>00075
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<a name="l00076"></a>00076 <span class="keyword">template</span> <<span class="keyword">typename</span> BoxIn, <span class="keyword">typename</span> T, <span class="keyword">typename</span> BoxOut>
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<a name="l00077"></a>00077 <span class="keyword">struct </span><a class="code" href="group__buffer.html#gc9330cc842e4cdb3669e1ebe42bf94d4" title="Calculate buffer (= new geometry) around specified distance of geometry.">buffer</a><box_tag, box_tag, BoxIn, T, BoxOut>
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<a name="l00078"></a>00078 {
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<a name="l00079"></a>00079 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(BoxIn <span class="keyword">const</span>& box_in, T <span class="keyword">const</span>& <a class="code" href="group__distance.html#g8fb8022d64a75b24c80a64ba46ec4738" title="Calculate distance between two geometries with a specified strategy.">distance</a>,
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<a name="l00080"></a>00080 T <span class="keyword">const</span>& chord_length, BoxIn& box_out)
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<a name="l00081"></a>00081 {
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<a name="l00082"></a>00082 detail::buffer::buffer_box(box_in, distance, box_out);
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<a name="l00083"></a>00083 }
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<a name="l00084"></a>00084 };
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<a name="l00085"></a>00085
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<a name="l00086"></a>00086 <span class="comment">// Many things to do. Point is easy, other geometries require self intersections</span>
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<a name="l00087"></a>00087 <span class="comment">// For point, note that it should output as a polygon (like the rest). Buffers</span>
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<a name="l00088"></a>00088 <span class="comment">// of a set of geometries are often lateron combined using a "dissolve" operation.</span>
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<a name="l00089"></a>00089 <span class="comment">// Two points close to each other get a combined kidney shaped buffer then.</span>
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<a name="l00090"></a>00090
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<a name="l00091"></a>00091 } <span class="comment">// namespace dispatch</span>
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<a name="l00092"></a>00092 <span class="preprocessor">#endif // DOXYGEN_NO_DISPATCH</span>
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<a name="l00093"></a>00093 <span class="preprocessor"></span>
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<a name="l00094"></a>00094
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<a name="l00106"></a>00106 <span class="keyword">template</span> <<span class="keyword">typename</span> Input, <span class="keyword">typename</span> Output, <span class="keyword">typename</span> T>
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<a name="l00107"></a><a class="code" href="group__buffer.html#gc9330cc842e4cdb3669e1ebe42bf94d4">00107</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group__buffer.html#gc9330cc842e4cdb3669e1ebe42bf94d4" title="Calculate buffer (= new geometry) around specified distance of geometry.">buffer</a>(Input <span class="keyword">const</span>& geometry_in, Output& geometry_out,
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<a name="l00108"></a>00108 T <span class="keyword">const</span>& <a class="code" href="group__distance.html#g8fb8022d64a75b24c80a64ba46ec4738" title="Calculate distance between two geometries with a specified strategy.">distance</a>, T <span class="keyword">const</span>& chord_length = -1)
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<a name="l00109"></a>00109 {
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<a name="l00110"></a>00110 concept::check<const Input>();
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<a name="l00111"></a>00111 concept::check<Output>();
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<a name="l00112"></a>00112
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<a name="l00113"></a>00113 <a class="code" href="group__buffer.html#gc9330cc842e4cdb3669e1ebe42bf94d4" title="Calculate buffer (= new geometry) around specified distance of geometry.">dispatch::buffer</a>
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<a name="l00114"></a>00114 <
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<a name="l00115"></a>00115 <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1geometry__not__recognized__tag.html" title="&quot;default&quot; tag">tag<Input>::type</a>,
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<a name="l00116"></a>00116 <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1geometry__not__recognized__tag.html" title="&quot;default&quot; tag">tag<Output>::type</a>,
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<a name="l00117"></a>00117 Input,
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<a name="l00118"></a>00118 T,
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<a name="l00119"></a>00119 Output
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<a name="l00120"></a>00120 >::apply(geometry_in, distance, chord_length, geometry_out);
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<a name="l00121"></a>00121 }
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<a name="l00122"></a>00122
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<a name="l00132"></a>00132 <span class="keyword">template</span> <<span class="keyword">typename</span> Output, <span class="keyword">typename</span> Input, <span class="keyword">typename</span> T>
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<a name="l00133"></a><a class="code" href="group__buffer.html#g52678ccf91ab33af8a0adb57d6fe757a">00133</a> Output <a class="code" href="group__buffer.html#g52678ccf91ab33af8a0adb57d6fe757a" title="Calculate and return buffer (= new geometry) around specified distance of geometry...">make_buffer</a>(Input <span class="keyword">const</span>& geometry, T <span class="keyword">const</span>& <a class="code" href="group__distance.html#g8fb8022d64a75b24c80a64ba46ec4738" title="Calculate distance between two geometries with a specified strategy.">distance</a>, T <span class="keyword">const</span>& chord_length = -1)
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<a name="l00134"></a>00134 {
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<a name="l00135"></a>00135 concept::check<const Input>();
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<a name="l00136"></a>00136 concept::check<Output>();
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<a name="l00137"></a>00137
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<a name="l00138"></a>00138 Output geometry_out;
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<a name="l00139"></a>00139
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<a name="l00140"></a>00140 <a class="code" href="group__buffer.html#gc9330cc842e4cdb3669e1ebe42bf94d4" title="Calculate buffer (= new geometry) around specified distance of geometry.">dispatch::buffer</a>
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<a name="l00141"></a>00141 <
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<a name="l00142"></a>00142 <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1geometry__not__recognized__tag.html" title="&quot;default&quot; tag">tag<Input>::type</a>,
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<a name="l00143"></a>00143 <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1geometry__not__recognized__tag.html" title="&quot;default&quot; tag">tag<Output>::type</a>,
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<a name="l00144"></a>00144 Input,
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<a name="l00145"></a>00145 T,
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<a name="l00146"></a>00146 Output
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<a name="l00147"></a>00147 >::apply(geometry, distance, chord_length, geometry_out);
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<a name="l00148"></a>00148
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<a name="l00149"></a>00149 <span class="keywordflow">return</span> geometry_out;
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<a name="l00150"></a>00150 }
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<a name="l00151"></a>00151
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<a name="l00152"></a>00152 }} <span class="comment">// namespace boost::geometry</span>
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<a name="l00153"></a>00153
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<a name="l00154"></a>00154 <span class="preprocessor">#endif // BOOST_GEOMETRY_ALGORITHMS_BUFFER_HPP</span>
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</pre></div></div>
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<p>December 1, 2009</p>
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</small></td>
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<td align="right">
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<small>Copyright <20> 1995-2009 Barend Gehrels, Geodan, Amsterdam<br>
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Copyright <20> 2008-2009 Bruno Lalande, Paris<br>
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Copyright <20> 2009 Mateusz Loskot, Cadcorp, London<br>
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