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84<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_1878a3f4746a95c6aad317458cc7ef80.html">boost</a></li><li class="navelem"><a class="el" href="dir_0dcad0da4f36218cbabb216021de9867.html">sort</a></li><li class="navelem"><a class="el" href="dir_4aa236a92b75d6f514e733718a475329.html">spreadsort</a></li>  </ul>
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89<div class="title">float_sort.hpp</div>  </div>
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91<div class="contents">
92<a href="float__sort_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">//Templated Spreadsort-based implementation of float_sort and float_mem_cast</span></div>
93<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;</div>
94<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">//          Copyright Steven J. Ross 2001 - 2014.</span></div>
95<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div>
96<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">//    (See accompanying file LICENSE_1_0.txt or copy at</span></div>
97<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">//          http://www.boost.org/LICENSE_1_0.txt)</span></div>
98<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div>
99<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// See http://www.boost.org/libs/sort/ for library home page.</span></div>
100<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;</div>
101<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">/*</span></div>
102<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">Some improvements suggested by:</span></div>
103<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">Phil Endecott and Frank Gennari</span></div>
104<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">float_mem_cast fix provided by:</span></div>
105<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">Scott McMurray</span></div>
106<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">*/</span></div>
107<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div>
108<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#ifndef BOOST_FLOAT_SORT_HPP</span></div>
109<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#define BOOST_FLOAT_SORT_HPP</span></div>
110<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div>
111<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
112<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#include &lt;cstring&gt;</span></div>
113<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#include &lt;limits&gt;</span></div>
114<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#include &lt;boost/static_assert.hpp&gt;</span></div>
115<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#include &lt;boost/sort/spreadsort/detail/constants.hpp&gt;</span></div>
116<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="preprocessor">#include &lt;boost/sort/spreadsort/detail/float_sort.hpp&gt;</span></div>
117<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;</div>
118<div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="namespaceboost.html">   27</a></span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceboost.html">boost</a> {</div>
119<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html">   28</a></span>&#160;<span class="keyword">namespace </span>sort {</div>
120<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div>
121<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment"></span></div>
122<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">  /*!</span></div>
123<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">  \brief Casts a float to the specified integer type.</span></div>
124<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment"></span></div>
125<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment">  \tparam Data_type Floating-point IEEE 754/IEC559 type.</span></div>
126<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">  \tparam Cast_type Integer type (same size) to which to cast.</span></div>
127<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment"></span></div>
128<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">  \par Example:</span></div>
129<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">  \code</span></div>
130<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">  struct rightshift {</span></div>
131<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">    int operator()(const DATA_TYPE &amp;x, const unsigned offset) const {</span></div>
132<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">      return float_mem_cast&lt;KEY_TYPE, CAST_TYPE&gt;(x.key) &gt;&gt; offset;</span></div>
133<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">    }</span></div>
134<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment">  };</span></div>
135<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">  \endcode</span></div>
136<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">  */</span></div>
137<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;  <span class="keyword">template</span>&lt;<span class="keyword">class</span> Data_type, <span class="keyword">class</span> Cast_type&gt;</div>
138<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;  <span class="keyword">inline</span> Cast_type</div>
139<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html#ac3a946e197df6cfc4968c6371ace319b">   48</a></span>&#160;  <a class="code" href="namespaceboost_1_1sort.html#ac3a946e197df6cfc4968c6371ace319b">float_mem_cast</a>(<span class="keyword">const</span> Data_type &amp; data)</div>
140<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;  {</div>
141<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    <span class="comment">// Only cast IEEE floating-point numbers, and only to a same-sized integer.</span></div>
142<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    BOOST_STATIC_ASSERT(<span class="keyword">sizeof</span>(Cast_type) == <span class="keyword">sizeof</span>(Data_type));</div>
143<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    BOOST_STATIC_ASSERT(std::numeric_limits&lt;Data_type&gt;::is_iec559);</div>
144<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    BOOST_STATIC_ASSERT(std::numeric_limits&lt;Cast_type&gt;::is_integer);</div>
145<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    Cast_type result;</div>
146<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    std::memcpy(&amp;result, &amp;data, <span class="keyword">sizeof</span>(Cast_type));</div>
147<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="keywordflow">return</span> result;</div>
148<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;  }</div>
149<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div>
150<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment"></span></div>
151<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">  /*!</span></div>
152<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">    \brief @c float_sort with casting to the appropriate size.</span></div>
153<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">    \tparam RandomAccessIter &lt;a href=&quot;http://www.cplusplus.com/reference/iterator/RandomAccessIterator/&quot;&gt;Random access iterator&lt;/a&gt;</span></div>
154<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment"></span></div>
155<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">    \param[in] first Iterator pointer to first element.</span></div>
156<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">    \param[in] last Iterator pointing to one beyond the end of data.</span></div>
157<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment"></span></div>
158<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment">Some performance plots of runtime vs. n and log(range) are provided:\n</span></div>
159<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="comment">   &lt;a href=&quot;../../doc/graph/windows_float_sort.htm&quot;&gt; windows_float_sort&lt;/a&gt;</span></div>
160<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment">   \n</span></div>
161<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment">   &lt;a href=&quot;../../doc/graph/osx_float_sort.htm&quot;&gt; osx_float_sort&lt;/a&gt;</span></div>
162<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment"></span></div>
163<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment"></span></div>
164<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment"></span></div>
165<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment">   \par A simple example of sorting some floating-point is:</span></div>
166<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment">   \code</span></div>
167<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment">     vector&lt;float&gt; vec;</span></div>
168<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="comment">     vec.push_back(1.0);</span></div>
169<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment">     vec.push_back(2.3);</span></div>
170<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment">     vec.push_back(1.3);</span></div>
171<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="comment">     spreadsort(vec.begin(), vec.end());</span></div>
172<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="comment">   \endcode</span></div>
173<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment">   \par The sorted vector contains ascending values &quot;1.0 1.3 2.3&quot;.</span></div>
174<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment"></span></div>
175<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment">  */</span></div>
176<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">class</span> RandomAccessIter&gt;</div>
177<div class="line"><a name="l00086"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html#acbcfc139de18c5c35c0ff1744c56e211">   86</a></span>&#160;  <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="namespaceboost_1_1sort.html#acbcfc139de18c5c35c0ff1744c56e211">float_sort</a>(RandomAccessIter first, RandomAccessIter last)</div>
178<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;  {</div>
179<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <span class="keywordflow">if</span> (last - first &lt; detail::min_sort_size)</div>
180<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;      std::sort(first, last);</div>
181<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    <span class="keywordflow">else</span></div>
182<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;      <a class="code" href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e">detail::float_sort</a>(first, last);</div>
183<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;  }</div>
184<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment"></span></div>
185<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="comment">  /*!</span></div>
186<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment">    \brief Floating-point sort algorithm using random access iterators with just right-shift functor.</span></div>
187<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment">    \tparam RandomAccessIter &lt;a href=&quot;http://www.cplusplus.com/reference/iterator/RandomAccessIterator/&quot;&gt;Random access iterator&lt;/a&gt;</span></div>
188<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;<span class="comment">    \tparam Right_shift Functor for right-shift by parameter @c shift bits.</span></div>
189<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="comment"></span></div>
190<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment">    \param[in] first Iterator pointer to first element.</span></div>
191<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="comment">    \param[in] last Iterator pointing to one beyond the end of data.</span></div>
192<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="comment">    \param[in] rshift Number of bits to right-shift (using functor).</span></div>
193<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="comment"></span></div>
194<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;<span class="comment">  */</span></div>
195<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">class</span> RandomAccessIter, <span class="keyword">class</span> Right_shift&gt;</div>
196<div class="line"><a name="l00105"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html#ad65f9ec25686acfbd2a59683cc99be12">  105</a></span>&#160;  <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="namespaceboost_1_1sort.html#acbcfc139de18c5c35c0ff1744c56e211">float_sort</a>(RandomAccessIter first, RandomAccessIter last,</div>
197<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;                         Right_shift rshift)</div>
198<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;  {</div>
199<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    <span class="keywordflow">if</span> (last - first &lt; detail::min_sort_size)</div>
200<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;      std::sort(first, last);</div>
201<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    <span class="keywordflow">else</span></div>
202<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;      <a class="code" href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e">detail::float_sort</a>(first, last, rshift(*first, 0), rshift);</div>
203<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;  }</div>
204<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;</div>
205<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="comment"></span></div>
206<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="comment">  /*!</span></div>
207<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="comment">   \brief Float sort algorithm using random access iterators with both right-shift and user-defined comparison operator.</span></div>
208<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<span class="comment"></span></div>
209<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;<span class="comment">   \tparam RandomAccessIter &lt;a href=&quot;http://www.cplusplus.com/reference/iterator/RandomAccessIterator/&quot;&gt;Random access iterator&lt;/a&gt;</span></div>
210<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;<span class="comment">   \tparam Right_shift functor for right-shift by parameter @c shift bits.</span></div>
211<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="comment">   \tparam Comp To provide @c operator&lt; for user-defined comparison.</span></div>
212<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;<span class="comment"></span></div>
213<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;<span class="comment">   \param[in] first Iterator pointer to first element.</span></div>
214<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;<span class="comment">   \param[in] last Iterator pointing to one beyond the end of data.</span></div>
215<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;<span class="comment">   \param[in] rshift Number of bits to right-shift (using functor).</span></div>
216<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;<span class="comment">   \param[in] comp comparison functor.</span></div>
217<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;<span class="comment">  */</span></div>
218<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;</div>
219<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">class</span> RandomAccessIter, <span class="keyword">class</span> Right_shift, <span class="keyword">class</span> Compare&gt;</div>
220<div class="line"><a name="l00129"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e">  129</a></span>&#160;  <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="namespaceboost_1_1sort.html#acbcfc139de18c5c35c0ff1744c56e211">float_sort</a>(RandomAccessIter first, RandomAccessIter last,</div>
221<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;                         Right_shift rshift, Compare comp)</div>
222<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;  {</div>
223<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;    <span class="keywordflow">if</span> (last - first &lt; detail::min_sort_size)</div>
224<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;      std::sort(first, last, comp);</div>
225<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    <span class="keywordflow">else</span></div>
226<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;      <a class="code" href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e">detail::float_sort</a>(first, last, rshift(*first, 0), rshift, comp);</div>
227<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;  }</div>
228<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;}</div>
229<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;}</div>
230<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;</div>
231<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;<span class="preprocessor">#endif</span></div>
232<div class="ttc" id="namespaceboost_html"><div class="ttname"><a href="namespaceboost.html">boost</a></div><div class="ttdef"><b>Definition:</b> float_sort.hpp:27</div></div>
233<div class="ttc" id="namespaceboost_1_1sort_html_a941746cb1461c5f4971c2cf1efb9301e"><div class="ttname"><a href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e">boost::sort::float_sort</a></div><div class="ttdeci">void float_sort(RandomAccessIter first, RandomAccessIter last, Right_shift rshift, Compare comp)</div><div class="ttdoc">Float sort algorithm using random access iterators with both right-shift and user-defined comparison ...</div><div class="ttdef"><b>Definition:</b> float_sort.hpp:129</div></div>
234<div class="ttc" id="namespaceboost_1_1sort_html_ac3a946e197df6cfc4968c6371ace319b"><div class="ttname"><a href="namespaceboost_1_1sort.html#ac3a946e197df6cfc4968c6371ace319b">boost::sort::float_mem_cast</a></div><div class="ttdeci">Cast_type float_mem_cast(const Data_type &amp;data)</div><div class="ttdoc">Casts a float to the specified integer type. </div><div class="ttdef"><b>Definition:</b> float_sort.hpp:48</div></div>
235<div class="ttc" id="namespaceboost_1_1sort_html_acbcfc139de18c5c35c0ff1744c56e211"><div class="ttname"><a href="namespaceboost_1_1sort.html#acbcfc139de18c5c35c0ff1744c56e211">boost::sort::float_sort</a></div><div class="ttdeci">void float_sort(RandomAccessIter first, RandomAccessIter last)</div><div class="ttdoc">float_sort with casting to the appropriate size. </div><div class="ttdef"><b>Definition:</b> float_sort.hpp:86</div></div>
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