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<a href="appendline_8cpp.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">/*******************************************************************************</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * tlx/string/appendline.cpp</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Part of tlx - http:https://panthema.net/tlx</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * Copyright (C) 2019 Timo Bingmann <[email protected]></span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> *</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * All rights reserved. Published under the Boost Software License, Version 1.0</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> ******************************************************************************/</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <<a class="code" href="appendline_8hpp.html">tlx/string/appendline.hpp</a>></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <algorithm></span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span><a class="code" href="namespacetlx.html">tlx</a> {</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"><a class="line" href="group__tlx__string.html#ga2883e674ccdbb4a5a4f8b22b5a482f5d"> 17</a></span> std::istream& <a class="code" href="group__tlx__string.html#ga2883e674ccdbb4a5a4f8b22b5a482f5d">appendline</a>(std::istream& is, std::string& str, <span class="keywordtype">char</span> delim) {</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordtype">size_t</span> size = str.size();</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keywordtype">size_t</span> capacity = str.capacity();</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  std::streamsize rest = capacity - size;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">if</span> (rest == 0) {</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="comment">// if rest is zero, already expand string</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  capacity = std::max(static_cast<size_t>(8), capacity * 2);</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  rest = capacity - size;</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  }</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">// give getline access to all of capacity</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  str.resize(capacity);</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="comment">// get until delim or rest is filled</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  is.getline(const_cast<char*>(str.data()) + size, rest, delim);</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="comment">// gcount includes the delimiter</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">size_t</span> new_size = size + is.gcount();</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="comment">// is failbit set?</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">if</span> (!is) {</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="comment">// if string ran out of space, expand, and retry</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">if</span> (is.gcount() + 1 == rest) {</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  is.clear();</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  str.resize(new_size);</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  str.reserve(capacity * 2);</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span> <a class="code" href="group__tlx__string.html#ga2883e674ccdbb4a5a4f8b22b5a482f5d">appendline</a>(is, str, delim);</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// else fall through and deliver error</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  }</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!is.eof()) {</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// subtract delimiter</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  --new_size;</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  }</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// resize string to fit its contents</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  str.resize(new_size);</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">return</span> is;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> }</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> } <span class="comment">// namespace tlx</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">/******************************************************************************/</span></div><div class="ttc" id="group__tlx__string_html_ga2883e674ccdbb4a5a4f8b22b5a482f5d"><div class="ttname"><a href="group__tlx__string.html#ga2883e674ccdbb4a5a4f8b22b5a482f5d">tlx::appendline</a></div><div class="ttdeci">std::istream & appendline(std::istream &is, std::string &str, char delim)</div><div class="ttdoc">like std::getline(istream, string, delim) except that it appends to the string, possibly reusing buff...</div><div class="ttdef"><b>Definition:</b> <a href="appendline_8cpp_source.html#l00017">appendline.cpp:17</a></div></div>
<div class="ttc" id="namespacetlx_html"><div class="ttname"><a href="namespacetlx.html">tlx</a></div><div class="ttdef"><b>Definition:</b> <a href="exclusive__scan_8hpp_source.html#l00017">exclusive_scan.hpp:17</a></div></div>
<div class="ttc" id="appendline_8hpp_html"><div class="ttname"><a href="appendline_8hpp.html">appendline.hpp</a></div></div>
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