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<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> <span class="comment">//Templated Spreadsort-based implementation of float_sort and float_mem_cast</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright Steven J. Ross 2001 - 2014.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// (See accompanying file LICENSE_1_0.txt or copy at</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// See http://www.boost.org/libs/sort/ for library home page.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">Some improvements suggested by:</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">Phil Endecott and Frank Gennari</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">float_mem_cast fix provided by:</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">Scott McMurray</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#ifndef BOOST_FLOAT_SORT_HPP</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#define BOOST_FLOAT_SORT_HPP</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <algorithm></span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <vector></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <cstring></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <limits></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <boost/static_assert.hpp></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <boost/sort/spreadsort/detail/constants.hpp></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <boost/sort/spreadsort/detail/float_sort.hpp></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="namespaceboost.html"> 27</a></span> <span class="keyword">namespace </span><a class="code" href="namespaceboost.html">boost</a> {</div>
<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html"> 28</a></span> <span class="keyword">namespace </span>sort {</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> /*!</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> \brief Casts a float to the specified integer type.</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"></span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> \tparam Data_type Floating-point IEEE 754/IEC559 type.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> \tparam Cast_type Integer type (same size) to which to cast.</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"></span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> \par Example:</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> \code</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> struct rightshift {</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> int operator()(const DATA_TYPE &x, const unsigned offset) const {</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> return float_mem_cast<KEY_TYPE, CAST_TYPE>(x.key) >> offset;</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> }</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> };</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> \endcode</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">template</span><<span class="keyword">class</span> Data_type, <span class="keyword">class</span> Cast_type></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">inline</span> Cast_type</div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html#ac3a946e197df6cfc4968c6371ace319b"> 48</a></span>  <a class="code" href="namespaceboost_1_1sort.html#ac3a946e197df6cfc4968c6371ace319b">float_mem_cast</a>(<span class="keyword">const</span> Data_type & data)</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  {</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// Only cast IEEE floating-point numbers, and only to a same-sized integer.</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  BOOST_STATIC_ASSERT(<span class="keyword">sizeof</span>(Cast_type) == <span class="keyword">sizeof</span>(Data_type));</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  BOOST_STATIC_ASSERT(std::numeric_limits<Data_type>::is_iec559);</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  BOOST_STATIC_ASSERT(std::numeric_limits<Cast_type>::is_integer);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  Cast_type result;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  std::memcpy(&result, &data, <span class="keyword">sizeof</span>(Cast_type));</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  }</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"></span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> /*!</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> \brief @c float_sort with casting to the appropriate size.</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> \tparam RandomAccessIter <a href="http://www.cplusplus.com/reference/iterator/RandomAccessIterator/">Random access iterator</a></span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"></span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> \param[in] first Iterator pointer to first element.</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> \param[in] last Iterator pointing to one beyond the end of data.</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"></span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">Some performance plots of runtime vs. n and log(range) are provided:\n</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> <a href="../../doc/graph/windows_float_sort.htm"> windows_float_sort</a></span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> \n</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> <a href="../../doc/graph/osx_float_sort.htm"> osx_float_sort</a></span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"></span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"></span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"></span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> \par A simple example of sorting some floating-point is:</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> \code</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> vector<float> vec;</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> vec.push_back(1.0);</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> vec.push_back(2.3);</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> vec.push_back(1.3);</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> spreadsort(vec.begin(), vec.end());</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> \endcode</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> \par The sorted vector contains ascending values "1.0 1.3 2.3".</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"></span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">template</span> <<span class="keyword">class</span> RandomAccessIter></div>
<div class="line"><a name="l00086"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html#acbcfc139de18c5c35c0ff1744c56e211"> 86</a></span>  <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>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> (last - first < detail::min_sort_size)</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  std::sort(first, last);</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <a class="code" href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e">detail::float_sort</a>(first, last);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  }</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"></span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> /*!</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"> \brief Floating-point sort algorithm using random access iterators with just right-shift functor.</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> \tparam RandomAccessIter <a href="http://www.cplusplus.com/reference/iterator/RandomAccessIterator/">Random access iterator</a></span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> \tparam Right_shift Functor for right-shift by parameter @c shift bits.</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"></span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> \param[in] first Iterator pointer to first element.</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> \param[in] last Iterator pointing to one beyond the end of data.</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> \param[in] rshift Number of bits to right-shift (using functor).</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"></span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keyword">template</span> <<span class="keyword">class</span> RandomAccessIter, <span class="keyword">class</span> Right_shift></div>
<div class="line"><a name="l00105"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html#ad65f9ec25686acfbd2a59683cc99be12"> 105</a></span>  <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>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  Right_shift rshift)</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">if</span> (last - first < detail::min_sort_size)</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  std::sort(first, last);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <a class="code" href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e">detail::float_sort</a>(first, last, rshift(*first, 0), rshift);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  }</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"></span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> /*!</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> \brief Float sort algorithm using random access iterators with both right-shift and user-defined comparison operator.</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"></span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> \tparam RandomAccessIter <a href="http://www.cplusplus.com/reference/iterator/RandomAccessIterator/">Random access iterator</a></span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> \tparam Right_shift functor for right-shift by parameter @c shift bits.</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> \tparam Comp To provide @c operator< for user-defined comparison.</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"></span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> \param[in] first Iterator pointer to first element.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> \param[in] last Iterator pointing to one beyond the end of data.</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> \param[in] rshift Number of bits to right-shift (using functor).</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> \param[in] comp comparison functor.</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keyword">template</span> <<span class="keyword">class</span> RandomAccessIter, <span class="keyword">class</span> Right_shift, <span class="keyword">class</span> Compare></div>
<div class="line"><a name="l00129"></a><span class="lineno"><a class="line" href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e"> 129</a></span>  <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>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  Right_shift rshift, Compare comp)</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">if</span> (last - first < detail::min_sort_size)</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  std::sort(first, last, comp);</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <a class="code" href="namespaceboost_1_1sort.html#a941746cb1461c5f4971c2cf1efb9301e">detail::float_sort</a>(first, last, rshift(*first, 0), rshift, comp);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  }</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> }</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="preprocessor">#endif</span></div>
<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>
<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>
<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 &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>
<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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