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<li class="navelem"><a class="el" href="dir_df9c78dcf3f59a33b12284f95992a64b.html">ripple</a></li><li class="navelem"><a class="el" href="dir_5f536ab1985a8dcd28bcfd618bc58e92.html">basics</a></li> </ul>
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<div class="title">safe_cast.h</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//------------------------------------------------------------------------------</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> This file is part of rippled: https://github.com/ripple/rippled</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Copyright (c) 2018 Ripple Labs Inc.</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> Permission to use, copy, modify, and/or distribute this software for any</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> purpose with or without fee is hereby granted, provided that the above</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> copyright notice and this permission notice appear in all copies.</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">*/</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">//==============================================================================</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef RIPPLE_BASICS_SAFE_CAST_H_INCLUDED</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#define RIPPLE_BASICS_SAFE_CAST_H_INCLUDED</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/type_traits.html">type_traits</a>></span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span><a class="code" href="namespaceripple.html">ripple</a> {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  </div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// safe_cast adds compile-time checks to a static_cast to ensure that</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// the destination can hold all values of the source. This is particularly</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// handy when the source or destination is an enumeration type.</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">template</span> <<span class="keyword">class</span> Dest, <span class="keyword">class</span> Src></div>
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<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="namespaceripple.html#a5adbc123c2d72443b7efd2ab8df961b1"> 32</a></span> <span class="keyword">static</span> constexpr <span class="keywordtype">bool</span> <a class="code" href="namespaceripple.html#a5adbc123c2d72443b7efd2ab8df961b1">is_safetocasttovalue_v</a> =</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  (std::is_integral_v<Src> && std::is_integral_v<Dest>)&&(</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/is_signed.html">std::is_signed<Src>::value</a> || <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/is_unsigned.html">std::is_unsigned<Dest>::value</a>) &&</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  (<a class="codeRef" href="http://en.cppreference.com/w/cpp/types/is_signed.html">std::is_signed<Src>::value</a> != <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/is_signed.html">std::is_signed<Dest>::value</a></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  ? <span class="keyword">sizeof</span>(Dest) > <span class="keyword">sizeof</span>(Src)</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  : sizeof(Dest) >= sizeof(Src));</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="keyword">template</span> <<span class="keyword">class</span> Dest, <span class="keyword">class</span> Src></div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">inline</span> constexpr std::</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  enable_if_t<std::is_integral_v<Dest> && std::is_integral_v<Src>, Dest></div>
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<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="namespaceripple.html#a7890a68e8c69029083b8ac82cf219140"> 42</a></span>  <a class="code" href="namespaceripple.html#a6f30ee31f9359c69a5294921d5c10d0b">safe_cast</a>(Src s) noexcept</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  static_assert(</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  std::is_signed_v<Dest> || std::is_unsigned_v<Src>,</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="stringliteral">"Cannot cast signed to unsigned"</span>);</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  constexpr <span class="keywordtype">unsigned</span> not_same =</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  std::is_signed_v<Dest> != std::is_signed_v<Src>;</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  static_assert(</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keyword">sizeof</span>(Dest) >= <span class="keyword">sizeof</span>(Src) + not_same,</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="stringliteral">"Destination is too small to hold all values of source"</span>);</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>Dest<span class="keyword">></span>(s);</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> }</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">template</span> <<span class="keyword">class</span> Dest, <span class="keyword">class</span> Src></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">inline</span> constexpr std::</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  enable_if_t<std::is_enum_v<Dest> && std::is_integral_v<Src>, Dest></div>
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<div class="line"><a name="l00058"></a><span class="lineno"><a class="line" href="namespaceripple.html#a804950522c4aed0eaeecf72d626a839b"> 58</a></span>  <a class="code" href="namespaceripple.html#a6f30ee31f9359c69a5294921d5c10d0b">safe_cast</a>(Src s) noexcept</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> {</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>Dest<span class="keyword">></span>(safe_cast<std::underlying_type_t<Dest>>(s));</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> }</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="keyword">template</span> <<span class="keyword">class</span> Dest, <span class="keyword">class</span> Src></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="keyword">inline</span> constexpr std::</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  enable_if_t<std::is_integral_v<Dest> && std::is_enum_v<Src>, Dest></div>
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<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="namespaceripple.html#a028005f6656f5f2b8ee1e3e17d5e0af8"> 66</a></span>  <a class="code" href="namespaceripple.html#a6f30ee31f9359c69a5294921d5c10d0b">safe_cast</a>(Src s) noexcept</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> {</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">return</span> safe_cast<Dest>(<span class="keyword">static_cast<</span><a class="codeRef" href="http://en.cppreference.com/w/cpp/types/underlying_type.html">std::underlying_type_t<Src></a><span class="keyword">></span>(s));</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> }</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// unsafe_cast explicitly flags a static_cast as not necessarily able to hold</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// all values of the source. It includes a compile-time check so that if</span></div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// underlying types become safe, it can be converted to a safe_cast.</span></div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  </div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="keyword">template</span> <<span class="keyword">class</span> Dest, <span class="keyword">class</span> Src></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="keyword">inline</span> constexpr std::</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  enable_if_t<std::is_integral_v<Dest> && std::is_integral_v<Src>, Dest></div>
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<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="namespaceripple.html#ab4905950415a3a4bd7e2c9094adcf30f"> 78</a></span>  <a class="code" href="namespaceripple.html#a488ed8c31419d36c6f9af5e9eef703a4">unsafe_cast</a>(Src s) noexcept</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> {</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  static_assert(</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  !is_safetocasttovalue_v<Dest, Src>,</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="stringliteral">"Only unsafe if casting signed to unsigned or "</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="stringliteral">"destination is too small"</span>);</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>Dest<span class="keyword">></span>(s);</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> }</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="keyword">template</span> <<span class="keyword">class</span> Dest, <span class="keyword">class</span> Src></div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="keyword">inline</span> constexpr std::</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  enable_if_t<std::is_enum_v<Dest> && std::is_integral_v<Src>, Dest></div>
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<div class="line"><a name="l00090"></a><span class="lineno"><a class="line" href="namespaceripple.html#a51f247f0d49bb4b1750b71d873c1a194"> 90</a></span>  <a class="code" href="namespaceripple.html#a488ed8c31419d36c6f9af5e9eef703a4">unsafe_cast</a>(Src s) noexcept</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> {</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>Dest<span class="keyword">></span>(unsafe_cast<std::underlying_type_t<Dest>>(s));</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> }</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  </div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="keyword">template</span> <<span class="keyword">class</span> Dest, <span class="keyword">class</span> Src></div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="keyword">inline</span> constexpr std::</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  enable_if_t<std::is_integral_v<Dest> && std::is_enum_v<Src>, Dest></div>
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<div class="line"><a name="l00098"></a><span class="lineno"><a class="line" href="namespaceripple.html#afadd26fe6df3774c0b409a88e271a990"> 98</a></span>  <a class="code" href="namespaceripple.html#a488ed8c31419d36c6f9af5e9eef703a4">unsafe_cast</a>(Src s) noexcept</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> {</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">return</span> unsafe_cast<Dest>(<span class="keyword">static_cast<</span><a class="codeRef" href="http://en.cppreference.com/w/cpp/types/underlying_type.html">std::underlying_type_t<Src></a><span class="keyword">></span>(s));</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> }</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  </div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> } <span class="comment">// namespace ripple</span></div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="preprocessor">#endif</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="ais_signed_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/is_signed.html">std::is_signed</a></div></div>
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<div class="ttc" id="ais_unsigned_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/is_unsigned.html">std::is_unsigned</a></div></div>
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<div class="ttc" id="anamespaceripple_html_a488ed8c31419d36c6f9af5e9eef703a4"><div class="ttname"><a href="namespaceripple.html#a488ed8c31419d36c6f9af5e9eef703a4">ripple::unsafe_cast</a></div><div class="ttdeci">constexpr std::enable_if_t< std::is_same_v< typename Dest::unit_type, typename Src::unit_type > &&std::is_integral_v< typename Dest::value_type > &&std::is_integral_v< typename Src::value_type >, Dest > unsafe_cast(Src s) noexcept</div><div class="ttdef"><b>Definition:</b> <a href="FeeUnits_8h_source.html#l00544">FeeUnits.h:544</a></div></div>
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<div class="ttc" id="aunderlying_type_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/underlying_type.html">std::underlying_type_t</a></div></div>
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<div class="ttc" id="anamespaceripple_html_a6f30ee31f9359c69a5294921d5c10d0b"><div class="ttname"><a href="namespaceripple.html#a6f30ee31f9359c69a5294921d5c10d0b">ripple::safe_cast</a></div><div class="ttdeci">constexpr std::enable_if_t< std::is_same_v< typename Dest::unit_type, typename Src::unit_type > &&std::is_integral_v< typename Dest::value_type > &&std::is_integral_v< typename Src::value_type >, Dest > safe_cast(Src s) noexcept</div><div class="ttdef"><b>Definition:</b> <a href="FeeUnits_8h_source.html#l00532">FeeUnits.h:532</a></div></div>
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<div class="ttc" id="anamespaceripple_html"><div class="ttname"><a href="namespaceripple.html">ripple</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition:</b> <a href="RCLCensorshipDetector_8h_source.html#l00029">RCLCensorshipDetector.h:29</a></div></div>
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<div class="ttc" id="anamespaceripple_html_a5adbc123c2d72443b7efd2ab8df961b1"><div class="ttname"><a href="namespaceripple.html#a5adbc123c2d72443b7efd2ab8df961b1">ripple::is_safetocasttovalue_v</a></div><div class="ttdeci">static constexpr bool is_safetocasttovalue_v</div><div class="ttdef"><b>Definition:</b> <a href="safe__cast_8h_source.html#l00032">safe_cast.h:32</a></div></div>
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<div class="ttc" id="atype_traits_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/type_traits.html">type_traits</a></div></div>
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