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<h1>boost/geometry/util/select_most_precise.hpp</h1><a href="select__most__precise_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_UTIL_SELECT_MOST_PRECISE_HPP</span>
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<a name="l00010"></a>00010 <span class="preprocessor"></span><span class="preprocessor">#define BOOST_GEOMETRY_UTIL_SELECT_MOST_PRECISE_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/mpl/if.hpp></span>
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<a name="l00013"></a>00013 <span class="preprocessor">#include <boost/type_traits.hpp></span>
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<a name="l00014"></a>00014
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<a name="l00015"></a>00015
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<a name="l00016"></a>00016 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>geometry
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<a name="l00017"></a>00017 {
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<a name="l00018"></a>00018
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<a name="l00019"></a>00019 <span class="preprocessor">#ifndef DOXYGEN_NO_DETAIL</span>
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<a name="l00020"></a>00020 <span class="preprocessor"></span>
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<a name="l00021"></a>00021 <span class="keyword">namespace </span>detail { <span class="keyword">namespace </span>select_most_precise {
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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="comment">// At least one of the types is non-fundamental. Take that one.</span>
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<a name="l00025"></a>00025 <span class="comment">// if both are non-fundamental, the type-to-be-selected</span>
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<a name="l00026"></a>00026 <span class="comment">// is unknown, it should be defined by explicit specialization.</span>
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<a name="l00027"></a>00027 <span class="keyword">template</span> <<span class="keywordtype">bool</span> Fundamental1, <span class="keywordtype">bool</span> Fundamental2, <span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00028"></a>00028 <span class="keyword">struct </span>select_non_fundamental
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<a name="l00029"></a>00029 {
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<a name="l00030"></a>00030 <span class="keyword">typedef</span> T1 type;
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<a name="l00031"></a>00031 };
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<a name="l00032"></a>00032
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<a name="l00033"></a>00033 <span class="keyword">template</span> <<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00034"></a>00034 <span class="keyword">struct </span>select_non_fundamental<true, false, T1, T2>
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<a name="l00035"></a>00035 {
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<a name="l00036"></a>00036 <span class="keyword">typedef</span> T2 type;
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<a name="l00037"></a>00037 };
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<a name="l00038"></a>00038
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<a name="l00039"></a>00039 <span class="keyword">template</span> <<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00040"></a>00040 <span class="keyword">struct </span>select_non_fundamental<false, true, T1, T2>
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<a name="l00041"></a>00041 {
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<a name="l00042"></a>00042 <span class="keyword">typedef</span> T1 type;
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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
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<a name="l00046"></a>00046 <span class="comment">// Selection of largest type (e.g. int of <short int,int></span>
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<a name="l00047"></a>00047 <span class="comment">// It defaults takes the first one, if second is larger, take the second one</span>
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<a name="l00048"></a>00048 <span class="keyword">template</span> <<span class="keywordtype">bool</span> SecondLarger, <span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00049"></a>00049 <span class="keyword">struct </span>select_largest
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<a name="l00050"></a>00050 {
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<a name="l00051"></a>00051 <span class="keyword">typedef</span> T1 type;
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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 <span class="keyword">template</span> <<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00055"></a>00055 <span class="keyword">struct </span>select_largest<true, T1, T2>
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<a name="l00056"></a>00056 {
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<a name="l00057"></a>00057 <span class="keyword">typedef</span> T2 type;
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<a name="l00058"></a>00058 };
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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 <span class="comment">// Selection of floating point and specializations:</span>
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<a name="l00063"></a>00063 <span class="comment">// both FP or both !FP does never occur...</span>
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<a name="l00064"></a>00064 <span class="keyword">template</span> <<span class="keywordtype">bool</span> FP1, <span class="keywordtype">bool</span> FP2, <span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00065"></a>00065 <span class="keyword">struct </span>select_floating_point
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<a name="l00066"></a>00066 {
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<a name="l00067"></a>00067 <span class="keyword">typedef</span> <span class="keywordtype">char</span> type;
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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
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<a name="l00071"></a>00071 <span class="comment">// ... so if ONE but not both of these types is floating point, take that one</span>
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<a name="l00072"></a>00072 <span class="keyword">template</span> <<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00073"></a>00073 <span class="keyword">struct </span>select_floating_point<true, false, T1, T2>
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<a name="l00074"></a>00074 {
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<a name="l00075"></a>00075 <span class="keyword">typedef</span> T1 type;
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<a name="l00076"></a>00076 };
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<a name="l00077"></a>00077
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<a name="l00078"></a>00078
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<a name="l00079"></a>00079 <span class="keyword">template</span> <<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00080"></a>00080 <span class="keyword">struct </span>select_floating_point<false, true, T1, T2>
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<a name="l00081"></a>00081 {
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<a name="l00082"></a>00082 <span class="keyword">typedef</span> T2 type;
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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">// namespace detail::select_most_precise</span>
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<a name="l00087"></a>00087 <span class="preprocessor">#endif // DOXYGEN_NO_DETAIL</span>
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<a name="l00088"></a>00088 <span class="preprocessor"></span>
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<a name="l00089"></a>00089
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<a name="l00110"></a>00110 <span class="keyword">template</span> <<span class="keyword">typename</span> T1, <span class="keyword">typename</span> T2>
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<a name="l00111"></a><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html">00111</a> <span class="keyword">struct </span><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html" title="Meta-function to select, of two types, the most accurate type for calculations.">select_most_precise</a>
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<a name="l00112"></a>00112 {
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<a name="l00113"></a><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#a41371c42f127d887a4bc75ab891ece3">00113</a> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#a41371c42f127d887a4bc75ab891ece3">second_larger</a> = <span class="keyword">sizeof</span>(T2) > <span class="keyword">sizeof</span>(T1);
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<a name="l00114"></a><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#15a1c2cfc3e0200646d0e4c5e9a13e3d">00114</a> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#15a1c2cfc3e0200646d0e4c5e9a13e3d">one_not_fundamental</a> = !
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<a name="l00115"></a>00115 (boost::is_fundamental<T1>::type::value
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<a name="l00116"></a>00116 && boost::is_fundamental<T2>::type::value);
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<a name="l00117"></a>00117
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<a name="l00118"></a><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#5b4e332741ed52358cc093edec4ba37a">00118</a> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#5b4e332741ed52358cc093edec4ba37a">both_same</a> =
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<a name="l00119"></a>00119 boost::is_floating_point<T1>::type::value
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<a name="l00120"></a>00120 == boost::is_floating_point<T2>::type::value;
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<a name="l00121"></a>00121
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<a name="l00122"></a>00122 <span class="keyword">typedef</span> <span class="keyword">typename</span> boost::mpl::if_c
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<a name="l00123"></a>00123 <
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<a name="l00124"></a>00124 <a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#15a1c2cfc3e0200646d0e4c5e9a13e3d">one_not_fundamental</a>,
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<a name="l00125"></a>00125 <span class="keyword">typename</span> detail::select_most_precise::select_non_fundamental
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<a name="l00126"></a>00126 <
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<a name="l00127"></a>00127 boost::is_fundamental<T1>::type::value,
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<a name="l00128"></a>00128 boost::is_fundamental<T2>::type::value,
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<a name="l00129"></a>00129 T1,
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<a name="l00130"></a>00130 T2
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<a name="l00131"></a>00131 ><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#191b1549644ddecbee7088dc1050aafb">::type</a>,
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<a name="l00132"></a>00132 <span class="keyword">typename</span> boost::mpl::if_c
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<a name="l00133"></a>00133 <
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<a name="l00134"></a>00134 <a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#5b4e332741ed52358cc093edec4ba37a">both_same</a>,
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<a name="l00135"></a>00135 <span class="keyword">typename</span> detail::select_most_precise::select_largest
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<a name="l00136"></a>00136 <
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<a name="l00137"></a>00137 <a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#a41371c42f127d887a4bc75ab891ece3">second_larger</a>,
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<a name="l00138"></a>00138 T1,
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<a name="l00139"></a>00139 T2
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<a name="l00140"></a>00140 ><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#191b1549644ddecbee7088dc1050aafb">::type</a>,
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<a name="l00141"></a>00141 <span class="keyword">typename</span> detail::select_most_precise::select_floating_point
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<a name="l00142"></a>00142 <
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<a name="l00143"></a>00143 boost::is_floating_point<T1>::type::value,
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<a name="l00144"></a>00144 boost::is_floating_point<T2>::type::value,
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<a name="l00145"></a>00145 T1,
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<a name="l00146"></a>00146 T2
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<a name="l00147"></a>00147 ><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#191b1549644ddecbee7088dc1050aafb">::type</a>
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<a name="l00148"></a>00148 ><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#191b1549644ddecbee7088dc1050aafb">::type</a>
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<a name="l00149"></a><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#191b1549644ddecbee7088dc1050aafb">00149</a> ><a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#191b1549644ddecbee7088dc1050aafb">::type</a> <a class="code" href="structboost_1_1geometry_1_1select__most__precise.html#191b1549644ddecbee7088dc1050aafb">type</a>;
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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
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<a name="l00153"></a>00153
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<a name="l00154"></a>00154 }} <span class="comment">// namespace boost::geometry</span>
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<a name="l00155"></a>00155
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<a name="l00156"></a>00156 <span class="preprocessor">#endif // BOOST_GEOMETRY_UTIL_SELECT_MOST_PRECISE_HPP</span>
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</pre></div></div>
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<p>December 1, 2009</p>
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<small>Copyright © 1995-2009 Barend Gehrels, Geodan, Amsterdam<br>
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Copyright © 2008-2009 Bruno Lalande, Paris<br>
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Copyright © 2009 Mateusz Loskot, Cadcorp, London<br>
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