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 <span id="projectnumber">52.1</span>
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<a href="stringpiece_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> <span class="comment">// Copyright (C) 2009-2013, International Business Machines</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Corporation and others. All Rights Reserved.</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">// Copyright 2001 and onwards Google Inc.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// Author: Sanjay Ghemawat</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// This code is a contribution of Google code, and the style used here is</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// a compromise between the original Google code and the ICU coding guidelines.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// For example, data types are ICU-ified (size_t,int->int32_t),</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// and API comments doxygen-ified, but function names and behavior are</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// as in the original, if possible.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// Assertion-style error handling, not available in ICU, was changed to</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// parameter "pinning" similar to UnicodeString.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">//</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// In addition, this is only a partial port of the original Google code,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// limited to what was needed so far. The (nearly) complete original code</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// is in the ICU svn repository at icuhtml/trunk/design/strings/contrib</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// (see ICU ticket 6765, r25517).</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef __STRINGPIECE_H__</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor"></span><span class="preprocessor">#define __STRINGPIECE_H__</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include "<a class="code" href="utypes_8h.html" title="Basic definitions for ICU, for both C and C++ APIs.">unicode/utypes.h</a>"</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include "<a class="code" href="uobject_8h.html" title="C++ API: Common ICU base class UObject.">unicode/uobject.h</a>"</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include "<a class="code" href="std__string_8h.html" title="C++ API: Central ICU header for including the C++ standard <string> header and for related definition...">unicode/std_string.h</a>"</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// Arghh! I wish C++ literals were "string".</span></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> <a class="code" href="uversion_8h.html#a7d9374e037299886d4192b763b4c5e8b" title="This is used to begin a declaration of a public ICU C++ API.">U_NAMESPACE_BEGIN</a></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html"> 52</a></span> <span class="keyword">class </span><a class="code" href="utypes_8h.html#a559955ec3bc692657c5d8b1c6de8e334" title="Set to export library symbols from inside the common library, and to import them from outside...">U_COMMON_API</a> <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a> : <span class="keyword">public</span> <a class="code" href="classicu_1_1UMemory.html" title="UMemory is the common ICU base class.">UMemory</a> {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">const</span> <span class="keywordtype">char</span>* ptr_;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  int32_t length_;</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>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00062"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#a883ea13586812cd22afd092f8d9dadf6"> 62</a></span>  <a class="code" href="classicu_1_1StringPiece.html#a883ea13586812cd22afd092f8d9dadf6" title="Default constructor, creates an empty StringPiece.">StringPiece</a>() : ptr_(<a class="code" href="utypes_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4" title="Define NULL if necessary, to 0 for C++ and to ((void *)0) for C.">NULL</a>), length_(0) { }</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* str);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor">#if U_HAVE_STD_STRING</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00074"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#ae52992082e683c5a8206ac3ec040f4aa"> 74</a></span>  <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>(<span class="keyword">const</span> std::string& str)</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  : ptr_(str.data()), length_(static_cast<int32_t>(str.size())) { }</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#af97f22b270d21d5c97337d5d58966a59"> 83</a></span>  <a class="code" href="classicu_1_1StringPiece.html#af97f22b270d21d5c97337d5d58966a59" title="Constructs from a const char * pointer and a specified length.">StringPiece</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* offset, int32_t len) : ptr_(offset), length_(len) { }</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>(<span class="keyword">const</span> <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>& x, int32_t pos);</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>(<span class="keyword">const</span> <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>& x, int32_t pos, int32_t len);</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#a25c65704b79b214d7ee450a896855742"> 111</a></span>  <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classicu_1_1StringPiece.html#a25c65704b79b214d7ee450a896855742" title="Returns the string pointer.">data</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr_; }</div>
<div class="line"><a name="l00117"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#aa06529e989075b4d80040252f9b476d2"> 117</a></span>  int32_t <a class="code" href="classicu_1_1StringPiece.html#aa06529e989075b4d80040252f9b476d2" title="Returns the string length.">size</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> length_; }</div>
<div class="line"><a name="l00123"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#a046b60b753e7015e327ffca3541d5f1d"> 123</a></span>  int32_t <a class="code" href="classicu_1_1StringPiece.html#a046b60b753e7015e327ffca3541d5f1d" title="Returns the string length.">length</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> length_; }</div>
<div class="line"><a name="l00129"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#ae8f070ad6e9426d9eb49220cfc55b89f"> 129</a></span>  <a class="code" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5" title="The ICU boolean type.">UBool</a> <a class="code" href="classicu_1_1StringPiece.html#ae8f070ad6e9426d9eb49220cfc55b89f" title="Returns whether the string is empty.">empty</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> length_ == 0; }</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div>
<div class="line"><a name="l00135"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#a556a1c4776319a54048f3017b6426d6a"> 135</a></span>  <span class="keywordtype">void</span> <a class="code" href="classicu_1_1StringPiece.html#a556a1c4776319a54048f3017b6426d6a" title="Sets to an empty string.">clear</a>() { ptr_ = <a class="code" href="utypes_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4" title="Define NULL if necessary, to 0 for C++ and to ((void *)0) for C.">NULL</a>; length_ = 0; }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div>
<div class="line"><a name="l00143"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#aa9fb8d13c5903207142dff23f7cf21bc"> 143</a></span>  <span class="keywordtype">void</span> <span class="keyword">set</span>(<span class="keyword">const</span> <span class="keywordtype">char</span>* xdata, int32_t len) { ptr_ = xdata; length_ = len; }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordtype">void</span> <span class="keyword">set</span>(<span class="keyword">const</span> <span class="keywordtype">char</span>* str);</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div>
<div class="line"><a name="l00157"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#abd554715ec521ecf2413923c8429c4b5"> 157</a></span>  <span class="keywordtype">void</span> <a class="code" href="classicu_1_1StringPiece.html#abd554715ec521ecf2413923c8429c4b5" title="Removes the first n string units.">remove_prefix</a>(int32_t n) {</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">if</span> (n >= 0) {</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">if</span> (n > length_) {</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  n = length_;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  ptr_ += n;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  length_ -= n;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  }</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  }</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div>
<div class="line"><a name="l00172"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#ac53d760ea1e9655cff791779fee49f58"> 172</a></span>  <span class="keywordtype">void</span> <a class="code" href="classicu_1_1StringPiece.html#ac53d760ea1e9655cff791779fee49f58" title="Removes the last n string units.">remove_suffix</a>(int32_t n) {</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">if</span> (n >= 0) {</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">if</span> (n <= length_) {</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  length_ -= n;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  length_ = 0;</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  }</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  }</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  }</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div>
<div class="line"><a name="l00186"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#a495638fbbd40637881ee185bd3413720"> 186</a></span>  <span class="keyword">static</span> <span class="keyword">const</span> int32_t <a class="code" href="classicu_1_1StringPiece.html#a495638fbbd40637881ee185bd3413720" title="Maximum integer, used as a default value for substring methods.">npos</a>; <span class="comment">// = 0x7fffffff;</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> </div>
<div class="line"><a name="l00196"></a><span class="lineno"><a class="code" href="classicu_1_1StringPiece.html#ae01471f3f3fbacd8c5397c48a663448f"> 196</a></span>  <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a> <a class="code" href="classicu_1_1StringPiece.html#ae01471f3f3fbacd8c5397c48a663448f" title="Returns a substring of this StringPiece.">substr</a>(int32_t pos, int32_t len = npos)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordflow">return</span> <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>(*<span class="keyword">this</span>, pos, len);</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  }</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> };</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <a class="code" href="platform_8h.html#a7d78411159504c2d6770763f924a1792">U_EXPORT</a> <a class="code" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5" title="The ICU boolean type.">UBool</a> U_EXPORT2 </div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <a class="code" href="namespaceicu.html#a1c2f6ca43e636f38d1a3291eb851e9f0" title="Global operator == for StringPiece.">operator==</a>(<span class="keyword">const</span> StringPiece& x, <span class="keyword">const</span> StringPiece& y);</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div>
<div class="line"><a name="l00218"></a><span class="lineno"><a class="code" href="namespaceicu.html#ae44c6e373e08014d12f6a4d51ca96b0e"> 218</a></span> <span class="keyword">inline</span> <a class="code" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5" title="The ICU boolean type.">UBool</a> <a class="code" href="namespaceicu.html#ae44c6e373e08014d12f6a4d51ca96b0e" title="Global operator != for StringPiece.">operator!=</a>(<span class="keyword">const</span> <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>& x, <span class="keyword">const</span> <a class="code" href="classicu_1_1StringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>& y) {</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keywordflow">return</span> !(x == y);</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> }</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <a class="code" href="uversion_8h.html#a3da1f00f3b02976ac53c014a3e4c0933" title="This is used to end a declaration of a public ICU C++ API.">U_NAMESPACE_END</a></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="preprocessor">#endif // __STRINGPIECE_H__</span></div>
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