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<h1>boost/geometry/algorithms/clear.hpp</h1><a href="clear_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_CLEAR_HPP</span>
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<a name="l00010"></a>00010 <span class="preprocessor"></span><span class="preprocessor">#define BOOST_GEOMETRY_ALGORITHMS_CLEAR_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 <boost/type_traits/remove_const.hpp></span>
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<a name="l00013"></a>00013
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<a name="l00014"></a>00014 <span class="preprocessor">#include <<a class="code" href="access_8hpp.html">boost/geometry/core/access.hpp</a>></span>
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<a name="l00015"></a>00015 <span class="preprocessor">#include <<a class="code" href="exterior__ring_8hpp.html">boost/geometry/core/exterior_ring.hpp</a>></span>
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<a name="l00016"></a>00016 <span class="preprocessor">#include <<a class="code" href="interior__rings_8hpp.html">boost/geometry/core/interior_rings.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="geometries_2concepts_2check_8hpp.html">boost/geometry/geometries/concepts/check.hpp</a>></span>
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<a name="l00019"></a>00019
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<a name="l00020"></a>00020
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<a name="l00021"></a>00021 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>geometry
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<a name="l00022"></a>00022 {
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<a name="l00023"></a>00023
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<a name="l00024"></a>00024 <span class="preprocessor">#ifndef DOXYGEN_NO_DETAIL</span>
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<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="keyword">namespace </span>detail { <span class="keyword">namespace </span><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a> {
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<a name="l00026"></a>00026
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<a name="l00027"></a>00027 <span class="keyword">template</span> <<span class="keyword">typename</span> Geometry>
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<a name="l00028"></a>00028 <span class="keyword">struct </span>use_std_clear
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<a name="l00029"></a>00029 {
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<a name="l00030"></a>00030 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Geometry& geometry)
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<a name="l00031"></a>00031 {
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<a name="l00032"></a>00032 geometry.clear();
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<a name="l00033"></a>00033 }
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<a name="l00034"></a>00034 };
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<a name="l00035"></a>00035
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<a name="l00036"></a>00036 <span class="keyword">template</span> <<span class="keyword">typename</span> Geometry>
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<a name="l00037"></a>00037 <span class="keyword">struct </span>use_traits_clear
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<a name="l00038"></a>00038 {
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<a name="l00039"></a>00039 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Geometry& geometry)
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<a name="l00040"></a>00040 {
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<a name="l00041"></a>00041 traits::clear<Geometry>::apply(geometry);
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<a name="l00042"></a>00042 }
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<a name="l00043"></a>00043 };
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<a name="l00044"></a>00044
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<a name="l00045"></a>00045 <span class="keyword">template</span> <<span class="keyword">typename</span> Polygon>
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<a name="l00046"></a>00046 <span class="keyword">struct </span>polygon_clear
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<a name="l00047"></a>00047 {
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<a name="l00048"></a>00048 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Polygon& polygon)
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<a name="l00049"></a>00049 {
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<a name="l00050"></a>00050 <a class="code" href="group__access.html#g5af585b056bb80bf3dfe7c07ad30d84a" title="Function to get the interior rings of a polygon (non const version).">interior_rings</a>(polygon).clear();
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<a name="l00051"></a>00051 <a class="code" href="group__access.html#gd96ba07cd3c6c3216bd5ab69adc9ccb5" title="Function to get the exterior_ring ring of a polygon.">exterior_ring</a>(polygon).clear();
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<a name="l00052"></a>00052 }
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<a name="l00053"></a>00053 };
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<a name="l00054"></a>00054
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<a name="l00055"></a>00055 <span class="keyword">template</span> <<span class="keyword">typename</span> Geometry>
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<a name="l00056"></a>00056 <span class="keyword">struct </span>no_action
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<a name="l00057"></a>00057 {
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<a name="l00058"></a>00058 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Geometry& geometry)
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<a name="l00059"></a>00059 {
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<a name="l00060"></a>00060 }
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<a name="l00061"></a>00061 };
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<a name="l00062"></a>00062
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<a name="l00063"></a>00063 }} <span class="comment">// namespace detail::clear</span>
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<a name="l00064"></a>00064 <span class="preprocessor">#endif // DOXYGEN_NO_DETAIL</span>
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<a name="l00065"></a>00065 <span class="preprocessor"></span>
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<a name="l00066"></a>00066 <span class="preprocessor">#ifndef DOXYGEN_NO_DISPATCH</span>
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<a name="l00067"></a>00067 <span class="preprocessor"></span><span class="keyword">namespace </span>dispatch
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<a name="l00068"></a>00068 {
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<a name="l00069"></a>00069
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<a name="l00070"></a>00070 <span class="keyword">template</span> <<span class="keyword">typename</span> Tag, <span class="keywordtype">bool</span> UseStd, <span class="keyword">typename</span> Geometry>
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<a name="l00071"></a>00071 <span class="keyword">struct </span><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a>
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<a name="l00072"></a>00072 {};
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<a name="l00073"></a>00073
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<a name="l00074"></a>00074 <span class="comment">// True (default for all geometry types, unless otherwise implemented in traits)</span>
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<a name="l00075"></a>00075 <span class="comment">// uses std::clear</span>
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<a name="l00076"></a>00076 <span class="keyword">template</span> <<span class="keyword">typename</span> Tag, <span class="keyword">typename</span> Geometry>
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<a name="l00077"></a>00077 <span class="keyword">struct </span><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a><Tag, true, Geometry>
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<a name="l00078"></a>00078 : detail::<a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a>::use_std_clear<Geometry>
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<a name="l00079"></a>00079 {};
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<a name="l00080"></a>00080
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<a name="l00081"></a>00081 <span class="comment">// If any geometry specializes use_std<Geometry> to false, specialize to use the traits clear.</span>
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<a name="l00082"></a>00082 <span class="keyword">template</span> <<span class="keyword">typename</span> Tag, <span class="keyword">typename</span> Geometry>
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<a name="l00083"></a>00083 <span class="keyword">struct </span><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a><Tag, false, Geometry>
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<a name="l00084"></a>00084 : detail::<a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a>::use_traits_clear<Geometry>
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<a name="l00085"></a>00085 {};
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<a name="l00086"></a>00086
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<a name="l00087"></a>00087 <span class="comment">// Point/box/segment do not have clear. So specialize to do nothing.</span>
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<a name="l00088"></a>00088 <span class="keyword">template</span> <<span class="keyword">typename</span> Geometry>
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<a name="l00089"></a>00089 <span class="keyword">struct </span><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a><point_tag, true, Geometry>
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<a name="l00090"></a>00090 : detail::<a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a>::no_action<Geometry>
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<a name="l00091"></a>00091 {};
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<a name="l00092"></a>00092
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<a name="l00093"></a>00093 <span class="keyword">template</span> <<span class="keyword">typename</span> Geometry>
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<a name="l00094"></a>00094 <span class="keyword">struct </span><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a><box_tag, true, Geometry>
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<a name="l00095"></a>00095 : detail::<a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a>::no_action<Geometry>
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<a name="l00096"></a>00096 {};
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<a name="l00097"></a>00097
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<a name="l00098"></a>00098 <span class="keyword">template</span> <<span class="keyword">typename</span> Geometry>
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<a name="l00099"></a>00099 <span class="keyword">struct </span><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a><segment_tag, true, Geometry>
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<a name="l00100"></a>00100 : detail::<a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a>::no_action<Geometry>
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<a name="l00101"></a>00101 {};
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<a name="l00102"></a>00102
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<a name="l00103"></a>00103
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<a name="l00104"></a>00104
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<a name="l00105"></a>00105
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<a name="l00106"></a>00106 <span class="comment">// Polygon can (indirectly) use std for clear</span>
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<a name="l00107"></a>00107 <span class="keyword">template</span> <<span class="keyword">typename</span> Polygon>
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<a name="l00108"></a>00108 <span class="keyword">struct </span><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a><polygon_tag, true, Polygon>
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<a name="l00109"></a>00109 : detail::<a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a>::polygon_clear<Polygon>
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<a name="l00110"></a>00110 {};
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<a name="l00111"></a>00111
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<a name="l00112"></a>00112
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<a name="l00113"></a>00113 } <span class="comment">// namespace dispatch</span>
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<a name="l00114"></a>00114 <span class="preprocessor">#endif // DOXYGEN_NO_DISPATCH</span>
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<a name="l00115"></a>00115 <span class="preprocessor"></span>
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<a name="l00116"></a>00116
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<a name="l00123"></a>00123 <span class="keyword">template</span> <<span class="keyword">typename</span> Geometry>
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<a name="l00124"></a><a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f">00124</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">clear</a>(Geometry& geometry)
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<a name="l00125"></a>00125 {
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<a name="l00126"></a>00126 concept::check<Geometry>();
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<a name="l00127"></a>00127
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<a name="l00128"></a>00128 <a class="code" href="group__access.html#g348a741e48c328300cdd9e886b1c3b2f" title="Clears a linestring, linear ring or polygon (exterior+interiors) or multi*.">dispatch::clear</a>
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<a name="l00129"></a>00129 <
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<a name="l00130"></a>00130 <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1geometry__not__recognized__tag.html" title="&quot;default&quot; tag">tag<Geometry>::type</a>,
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<a name="l00131"></a>00131 <a class="code" href="structboost_1_1geometry_1_1traits_1_1use__std.html" title="Traits class, optional, indicating that the std-library should be used.">traits::use_std</a>
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<a name="l00132"></a>00132 <
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<a name="l00133"></a>00133 <span class="keyword">typename</span> boost::remove_const<Geometry>::type
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<a name="l00134"></a>00134 >::value,
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<a name="l00135"></a>00135 Geometry
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<a name="l00136"></a>00136 >::apply(geometry);
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<a name="l00137"></a>00137 }
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<a name="l00138"></a>00138
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<a name="l00139"></a>00139 }} <span class="comment">// namespace boost::geometry</span>
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<a name="l00140"></a>00140
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<a name="l00141"></a>00141 <span class="preprocessor">#endif // BOOST_GEOMETRY_ALGORITHMS_CLEAR_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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