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<a href="type__traits_8h.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;</div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="preprocessor">#ifndef DMLC_TYPE_TRAITS_H_</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#define DMLC_TYPE_TRAITS_H_</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="3rdparty_2dmlc-core_2include_2dmlc_2base_8h.html">./base.h</a>&quot;</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#if DMLC_USE_CXX11</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &lt;string&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacedmlc.html">dmlc</a> {</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00021"></a><span class="lineno"><a class="line" href="structdmlc_1_1is__pod.html"> 21</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1is__pod.html">is_pod</a> {</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="preprocessor">#if DMLC_USE_CXX11</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="structdmlc_1_1is__pod.html#ae3fe8470e202240387371c660f5a196a"> 24</a></span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="structdmlc_1_1is__pod.html#ae3fe8470e202240387371c660f5a196a">value</a> = std::is_pod&lt;T&gt;::value;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> value = <span class="keyword">false</span>;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;};</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="structdmlc_1_1is__integral.html"> 37</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1is__integral.html">is_integral</a> {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="preprocessor">#if DMLC_USE_CXX11</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;</div><div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="structdmlc_1_1is__integral.html#aeba2ccf07923d7e98f2a8b21bb163767"> 40</a></span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="structdmlc_1_1is__pod.html#ae3fe8470e202240387371c660f5a196a">value</a> = std::is_integral&lt;T&gt;::value;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> value = <span class="keyword">false</span>;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;};</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="structdmlc_1_1is__floating__point.html"> 52</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1is__floating__point.html">is_floating_point</a> {</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;<span class="preprocessor">#if DMLC_USE_CXX11</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;</div><div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="structdmlc_1_1is__floating__point.html#a10a690eb1bea9cfd45144bcd424ca501"> 55</a></span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="structdmlc_1_1is__pod.html#ae3fe8470e202240387371c660f5a196a">value</a> = std::is_floating_point&lt;T&gt;::value;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> value = <span class="keyword">false</span>;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;};</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="structdmlc_1_1is__arithmetic.html"> 67</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1is__arithmetic.html">is_arithmetic</a> {</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;<span class="preprocessor">#if DMLC_USE_CXX11</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno"><a class="line" href="structdmlc_1_1is__arithmetic.html#a1e620475194ab2e19ac78f5b630e9ae2"> 70</a></span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="structdmlc_1_1is__pod.html#ae3fe8470e202240387371c660f5a196a">value</a> = std::is_arithmetic&lt;T&gt;::value;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> value = (<a class="code" href="structdmlc_1_1is__integral.html">dmlc::is_integral&lt;T&gt;::value</a> ||</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <a class="code" href="structdmlc_1_1is__floating__point.html">dmlc::is_floating_point&lt;T&gt;::value</a>);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;};</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00086"></a><span class="lineno"><a class="line" href="structdmlc_1_1type__name__helper.html"> 86</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1type__name__helper.html">type_name_helper</a> {</div><div class="line"><a name="l00090"></a><span class="lineno"><a class="line" href="structdmlc_1_1type__name__helper.html#a88ecdcdcac91973bfb7f87e9890e4e88"> 90</a></span>&#160; <span class="keyword">static</span> <span class="keyword">inline</span> std::string <a class="code" href="structdmlc_1_1type__name__helper.html#a88ecdcdcac91973bfb7f87e9890e4e88">value</a>() {</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;&quot;</span>;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; }</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160;};</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="namespacedmlc.html#a1e731f276d3a3efa8e17f46ccf35f828"> 101</a></span>&#160;<span class="keyword">inline</span> std::string <a class="code" href="namespacedmlc.html#a1e731f276d3a3efa8e17f46ccf35f828">type_name</a>() {</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordflow">return</span> <a class="code" href="structdmlc_1_1type__name__helper.html#a88ecdcdcac91973bfb7f87e9890e4e88">type_name_helper&lt;T&gt;::value</a>();</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;}</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00110"></a><span class="lineno"><a class="line" href="structdmlc_1_1has__saveload.html"> 110</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1has__saveload.html">has_saveload</a> {</div><div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="structdmlc_1_1has__saveload.html#a88785054da3cc5a6d2bf28bb6ea61e2f"> 112</a></span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="structdmlc_1_1is__pod.html#ae3fe8470e202240387371c660f5a196a">value</a> = <span class="keyword">false</span>;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;};</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160;<span class="keyword">template</span>&lt;<span class="keywordtype">bool</span> cond, <span class="keyword">typename</span> Then, <span class="keyword">typename</span> Else&gt;</div><div class="line"><a name="l00123"></a><span class="lineno"><a class="line" href="structdmlc_1_1IfThenElseType.html"> 123</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structdmlc_1_1IfThenElseType.html">IfThenElseType</a>;</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;</div><div class="line"><a name="l00126"></a><span class="lineno"><a class="line" href="type__traits_8h.html#ad29838fb4e93a8dd3efbdcd292c98bd5"> 126</a></span>&#160;<span class="preprocessor">#define DMLC_DECLARE_TRAITS(Trait, Type, Value) \</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160;<span class="preprocessor"> template&lt;&gt; \</span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;<span class="preprocessor"> struct Trait&lt;Type&gt; { \</span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;<span class="preprocessor"> static const bool value = Value; \</span></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;<span class="preprocessor"> }</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;</div><div class="line"><a name="l00133"></a><span class="lineno"><a class="line" href="type__traits_8h.html#ada1b1bad88ec717de715829068ff0d3e"> 133</a></span>&#160;<span class="preprocessor">#define DMLC_DECLARE_TYPE_NAME(Type, Name) \</span></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160;<span class="preprocessor"> template&lt;&gt; \</span></div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;<span class="preprocessor"> struct type_name_helper&lt;Type&gt; { \</span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160;<span class="preprocessor"> static inline std::string value() { \</span></div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160;<span class="preprocessor"> return Name; \</span></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;<span class="preprocessor"> } \</span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;<span class="preprocessor"> }</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160;</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160;<span class="comment">// declare special traits when C++11 is not available</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160;<span class="preprocessor">#if DMLC_USE_CXX11 == 0</span></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_pod, <span class="keywordtype">char</span>, <span class="keyword">true</span>);</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_pod, int8_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_pod, int16_t, <span 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name="l00151"></a><span class="lineno"> 151</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_pod, uint32_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_pod, uint64_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_pod, <span class="keywordtype">float</span>, <span class="keyword">true</span>);</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_pod, <span class="keywordtype">double</span>, <span class="keyword">true</span>);</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160;</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, <span class="keywordtype">char</span>, <span class="keyword">true</span>);</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, int8_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, int16_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, int32_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, int64_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, uint8_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, uint16_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, uint32_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_integral, uint64_t, <span class="keyword">true</span>);</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160;</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_floating_point, <span class="keywordtype">float</span>, <span class="keyword">true</span>);</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160;<a class="code" href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">DMLC_DECLARE_TRAITS</a>(is_floating_point, <span class="keywordtype">double</span>, <span class="keyword">true</span>);</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(<span class="keywordtype">float</span>, <span class="stringliteral">&quot;float&quot;</span>);</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(<span class="keywordtype">double</span>, <span class="stringliteral">&quot;double&quot;</span>);</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(<span class="keywordtype">int</span>, <span class="stringliteral">&quot;int&quot;</span>);</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(int64_t, <span class="stringliteral">&quot;long&quot;</span>);</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(uint32_t, <span class="stringliteral">&quot;int (non-negative)&quot;</span>);</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(uint64_t, <span class="stringliteral">&quot;long (non-negative)&quot;</span>);</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(std::string, <span class="stringliteral">&quot;string&quot;</span>);</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(<span class="keywordtype">bool</span>, <span class="stringliteral">&quot;boolean&quot;</span>);</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160;<a class="code" href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">DMLC_DECLARE_TYPE_NAME</a>(<span class="keywordtype">void</span>*, <span class="stringliteral">&quot;ptr&quot;</span>);</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> Then, <span class="keyword">typename</span> Else&gt;</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160;<span class="keyword">struct </span>IfThenElseType&lt;true, Then, Else&gt; {</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; <span class="keyword">typedef</span> Then Type;</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160;};</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160;</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> Then, <span class="keyword">typename</span> Else&gt;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160;<span class="keyword">struct </span>IfThenElseType&lt;false, Then, Else&gt; {</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; <span class="keyword">typedef</span> Else Type;</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160;};</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;} <span class="comment">// namespace dmlc</span></div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160;<span class="preprocessor">#endif // DMLC_TYPE_TRAITS_H_</span></div><div class="ttc" id="structdmlc_1_1type__name__helper_html_a88ecdcdcac91973bfb7f87e9890e4e88"><div class="ttname"><a href="structdmlc_1_1type__name__helper.html#a88ecdcdcac91973bfb7f87e9890e4e88">dmlc::type_name_helper::value</a></div><div class="ttdeci">static std::string value()</div><div class="ttdef"><b>Definition:</b> type_traits.h:90</div></div>
<div class="ttc" id="namespacedmlc_html_ae0e0e4f86115e4c4e7f761de5c8a6797"><div class="ttname"><a href="namespacedmlc.html#ae0e0e4f86115e4c4e7f761de5c8a6797">dmlc::DMLC_DECLARE_TYPE_NAME</a></div><div class="ttdeci">DMLC_DECLARE_TYPE_NAME(optional&lt; int &gt;, &quot;int or None&quot;)</div><div class="ttdoc">description for optional int </div></div>
<div class="ttc" id="structdmlc_1_1type__name__helper_html"><div class="ttname"><a href="structdmlc_1_1type__name__helper.html">dmlc::type_name_helper</a></div><div class="ttdoc">helper class to construct a string that represents type name </div><div class="ttdef"><b>Definition:</b> type_traits.h:86</div></div>
<div class="ttc" id="structdmlc_1_1is__pod_html"><div class="ttname"><a href="structdmlc_1_1is__pod.html">dmlc::is_pod</a></div><div class="ttdoc">whether a type is pod type </div><div class="ttdef"><b>Definition:</b> type_traits.h:21</div></div>
<div class="ttc" id="namespacedmlc_html_a7272c846fa03dee55916aadce0165a46"><div class="ttname"><a href="namespacedmlc.html#a7272c846fa03dee55916aadce0165a46">dmlc::DMLC_DECLARE_TRAITS</a></div><div class="ttdeci">DMLC_DECLARE_TRAITS(has_saveload, mxnet::NDArray, true)</div><div class="ttdoc">traits </div></div>
<div class="ttc" id="structdmlc_1_1has__saveload_html"><div class="ttname"><a href="structdmlc_1_1has__saveload.html">dmlc::has_saveload</a></div><div class="ttdoc">whether a type have save/load function </div><div class="ttdef"><b>Definition:</b> type_traits.h:110</div></div>
<div class="ttc" id="namespacedmlc_html"><div class="ttname"><a href="namespacedmlc.html">dmlc</a></div><div class="ttdoc">namespace for dmlc </div><div class="ttdef"><b>Definition:</b> array_view.h:12</div></div>
<div class="ttc" id="structdmlc_1_1is__floating__point_html"><div class="ttname"><a href="structdmlc_1_1is__floating__point.html">dmlc::is_floating_point</a></div><div class="ttdoc">whether a type is floating point type </div><div class="ttdef"><b>Definition:</b> type_traits.h:52</div></div>
<div class="ttc" id="structdmlc_1_1is__integral_html"><div class="ttname"><a href="structdmlc_1_1is__integral.html">dmlc::is_integral</a></div><div class="ttdoc">whether a type is integer type </div><div class="ttdef"><b>Definition:</b> type_traits.h:37</div></div>
<div class="ttc" id="structdmlc_1_1IfThenElseType_html"><div class="ttname"><a href="structdmlc_1_1IfThenElseType.html">dmlc::IfThenElseType</a></div><div class="ttdoc">template to select type based on condition For example, IfThenElseType&lt;true, int, float&gt;::Type will g...</div><div class="ttdef"><b>Definition:</b> type_traits.h:123</div></div>
<div class="ttc" id="structdmlc_1_1is__arithmetic_html"><div class="ttname"><a href="structdmlc_1_1is__arithmetic.html">dmlc::is_arithmetic</a></div><div class="ttdoc">whether a type is arithemetic type </div><div class="ttdef"><b>Definition:</b> type_traits.h:67</div></div>
<div class="ttc" id="structdmlc_1_1is__pod_html_ae3fe8470e202240387371c660f5a196a"><div class="ttname"><a href="structdmlc_1_1is__pod.html#ae3fe8470e202240387371c660f5a196a">dmlc::is_pod::value</a></div><div class="ttdeci">static const bool value</div><div class="ttdoc">the value of the traits </div><div class="ttdef"><b>Definition:</b> type_traits.h:24</div></div>
<div class="ttc" id="3rdparty_2dmlc-core_2include_2dmlc_2base_8h_html"><div class="ttname"><a href="3rdparty_2dmlc-core_2include_2dmlc_2base_8h.html">base.h</a></div></div>
<div class="ttc" id="namespacedmlc_html_a1e731f276d3a3efa8e17f46ccf35f828"><div class="ttname"><a href="namespacedmlc.html#a1e731f276d3a3efa8e17f46ccf35f828">dmlc::type_name</a></div><div class="ttdeci">std::string type_name()</div><div class="ttdoc">the string representation of type name </div><div class="ttdef"><b>Definition:</b> type_traits.h:101</div></div>
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