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<h1>stringpiece.h</h1><a href="stringpiece_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (C) 2010, International Business Machines</span>
<a name="l00002"></a>00002 <span class="comment">// Corporation and others. All Rights Reserved.</span>
<a name="l00003"></a>00003 <span class="comment">//</span>
<a name="l00004"></a>00004 <span class="comment">// Copyright 2001 and onwards Google Inc.</span>
<a name="l00005"></a>00005 <span class="comment">// Author: Sanjay Ghemawat</span>
<a name="l00006"></a>00006 
<a name="l00007"></a>00007 <span class="comment">// This code is a contribution of Google code, and the style used here is</span>
<a name="l00008"></a>00008 <span class="comment">// a compromise between the original Google code and the ICU coding guidelines.</span>
<a name="l00009"></a>00009 <span class="comment">// For example, data types are ICU-ified (size_t,int-&gt;int32_t),</span>
<a name="l00010"></a>00010 <span class="comment">// and API comments doxygen-ified, but function names and behavior are</span>
<a name="l00011"></a>00011 <span class="comment">// as in the original, if possible.</span>
<a name="l00012"></a>00012 <span class="comment">// Assertion-style error handling, not available in ICU, was changed to</span>
<a name="l00013"></a>00013 <span class="comment">// parameter &quot;pinning&quot; similar to UnicodeString.</span>
<a name="l00014"></a>00014 <span class="comment">//</span>
<a name="l00015"></a>00015 <span class="comment">// In addition, this is only a partial port of the original Google code,</span>
<a name="l00016"></a>00016 <span class="comment">// limited to what was needed so far. The (nearly) complete original code</span>
<a name="l00017"></a>00017 <span class="comment">// is in the ICU svn repository at icuhtml/trunk/design/strings/contrib</span>
<a name="l00018"></a>00018 <span class="comment">// (see ICU ticket 6765, r25517).</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="preprocessor">#ifndef __STRINGPIECE_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define __STRINGPIECE_H__</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include &quot;<a class="code" href="utypes_8h.html" title="Basic definitions for ICU, for both C and C++ APIs.">unicode/utypes.h</a>&quot;</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include &quot;<a class="code" href="uobject_8h.html" title="C++ API: Common ICU base class UObject.">unicode/uobject.h</a>&quot;</span>
<a name="l00030"></a>00030 <span class="preprocessor">#include &quot;<a class="code" href="std__string_8h.html" title="C++ API: Central ICU header for including the C++ standard &amp;lt;string&amp;gt; header...">unicode/std_string.h</a>&quot;</span>
<a name="l00031"></a>00031 
<a name="l00032"></a>00032 <span class="comment">// Arghh!  I wish C++ literals were &quot;string&quot;.</span>
<a name="l00033"></a>00033 
<a name="l00034"></a>00034 <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>
<a name="l00035"></a>00035 
<a name="l00052"></a><a class="code" href="classStringPiece.html">00052</a> <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...">U_COMMON_API</a> <a class="code" href="classStringPiece.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="classUMemory.html" title="UMemory is the common ICU base class.">UMemory</a> {
<a name="l00053"></a>00053  <span class="keyword">private</span>:
<a name="l00054"></a>00054   <span class="keyword">const</span> <span class="keywordtype">char</span>*   ptr_;
<a name="l00055"></a>00055   int32_t       length_;
<a name="l00056"></a>00056 
<a name="l00057"></a>00057  <span class="keyword">public</span>:
<a name="l00062"></a><a class="code" href="classStringPiece.html#a0f45b54fa594663333d1ac3c8d7c8997">00062</a>   <a class="code" href="classStringPiece.html#a0f45b54fa594663333d1ac3c8d7c8997" 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) { }
<a name="l00068"></a>00068   <a class="code" href="classStringPiece.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);
<a name="l00069"></a>00069 <span class="preprocessor">#if U_HAVE_STD_STRING</span>
<a name="l00070"></a>00070 <span class="preprocessor"></span>
<a name="l00074"></a><a class="code" href="classStringPiece.html#a698a3300cd837fbf68746ffc0c1ef3f3">00074</a>   <a class="code" href="classStringPiece.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="std__string_8h.html#a09ea9d17cd51b895003ea80a4e07b6dd" title="Define the namespace qualifier to use for standard C++ (STL) classes.">U_STD_NSQ</a> <span class="keywordtype">string</span>&amp; str)
<a name="l00075"></a>00075     : ptr_(str.data()), length_(static_cast&lt;int32_t&gt;(str.size())) { }
<a name="l00076"></a>00076 <span class="preprocessor">#endif</span>
<a name="l00077"></a>00077 <span class="preprocessor"></span>
<a name="l00083"></a><a class="code" href="classStringPiece.html#a1ebd684e27ba92ffdc17e9870355c56c">00083</a>   <a class="code" href="classStringPiece.html#a1ebd684e27ba92ffdc17e9870355c56c" 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) { }
<a name="l00090"></a>00090   <a class="code" href="classStringPiece.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="classStringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>&amp; x, int32_t pos);
<a name="l00099"></a>00099   <a class="code" href="classStringPiece.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="classStringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>&amp; x, int32_t pos, int32_t len);
<a name="l00100"></a>00100 
<a name="l00111"></a><a class="code" href="classStringPiece.html#a8c0f2264485f90b1d60aab587cab352f">00111</a>   <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="classStringPiece.html#a8c0f2264485f90b1d60aab587cab352f" title="Returns the string pointer.">data</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> ptr_; }
<a name="l00117"></a><a class="code" href="classStringPiece.html#a31645a6f83a6e338936007135d8f8a4d">00117</a>   int32_t <a class="code" href="classStringPiece.html#a31645a6f83a6e338936007135d8f8a4d" title="Returns the string length.">size</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> length_; }
<a name="l00123"></a><a class="code" href="classStringPiece.html#a56e2e8113c07d379a3deaaeed05dca60">00123</a>   int32_t <a class="code" href="classStringPiece.html#a56e2e8113c07d379a3deaaeed05dca60" title="Returns the string length.">length</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> length_; }
<a name="l00129"></a><a class="code" href="classStringPiece.html#a4789a54e17fc082bdbbb615a67a19120">00129</a>   <a class="code" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5" title="The ICU boolean type.">UBool</a> <a class="code" href="classStringPiece.html#a4789a54e17fc082bdbbb615a67a19120" title="Returns whether the string is empty.">empty</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> length_ == 0; }
<a name="l00130"></a>00130 
<a name="l00135"></a><a class="code" href="classStringPiece.html#aba33c86f6353d50835ee4627a7b70326">00135</a>   <span class="keywordtype">void</span> <a class="code" href="classStringPiece.html#aba33c86f6353d50835ee4627a7b70326" 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; }
<a name="l00136"></a>00136 
<a name="l00143"></a><a class="code" href="classStringPiece.html#abe0d6966ad467ae5fa675e3ecb16be77">00143</a>   <span class="keywordtype">void</span> <span class="keyword">set</span>(<span class="keyword">const</span> <span class="keywordtype">char</span>* data, int32_t len) { ptr_ = data; length_ = len; }
<a name="l00144"></a>00144 
<a name="l00150"></a>00150   <span class="keywordtype">void</span> <span class="keyword">set</span>(<span class="keyword">const</span> <span class="keywordtype">char</span>* str);
<a name="l00151"></a>00151 
<a name="l00157"></a><a class="code" href="classStringPiece.html#a52b2f79cab62b8bc75e204dcc896baae">00157</a>   <span class="keywordtype">void</span> <a class="code" href="classStringPiece.html#a52b2f79cab62b8bc75e204dcc896baae" title="Removes the first n string units.">remove_prefix</a>(int32_t n) {
<a name="l00158"></a>00158     <span class="keywordflow">if</span> (n &gt;= 0) {
<a name="l00159"></a>00159       <span class="keywordflow">if</span> (n &gt; length_) {
<a name="l00160"></a>00160         n = length_;
<a name="l00161"></a>00161       }
<a name="l00162"></a>00162       ptr_ += n;
<a name="l00163"></a>00163       length_ -= n;
<a name="l00164"></a>00164     }
<a name="l00165"></a>00165   }
<a name="l00166"></a>00166 
<a name="l00172"></a><a class="code" href="classStringPiece.html#ad1ed9b146e3ba745f3b91debff9511ac">00172</a>   <span class="keywordtype">void</span> <a class="code" href="classStringPiece.html#ad1ed9b146e3ba745f3b91debff9511ac" title="Removes the last n string units.">remove_suffix</a>(int32_t n) {
<a name="l00173"></a>00173     <span class="keywordflow">if</span> (n &gt;= 0) {
<a name="l00174"></a>00174       <span class="keywordflow">if</span> (n &lt;= length_) {
<a name="l00175"></a>00175         length_ -= n;
<a name="l00176"></a>00176       } <span class="keywordflow">else</span> {
<a name="l00177"></a>00177         length_ = 0;
<a name="l00178"></a>00178       }
<a name="l00179"></a>00179     }
<a name="l00180"></a>00180   }
<a name="l00181"></a>00181 
<a name="l00186"></a><a class="code" href="classStringPiece.html#a640079800d8239870fa07c84b7c5895b">00186</a>   <span class="keyword">static</span> <span class="keyword">const</span> int32_t npos = 0x7fffffff;
<a name="l00187"></a>00187 
<a name="l00196"></a><a class="code" href="classStringPiece.html#aad0e95f16e143ccfa69afbb33a9cf702">00196</a>   <a class="code" href="classStringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a> <a class="code" href="classStringPiece.html#aad0e95f16e143ccfa69afbb33a9cf702" title="Returns a substring of this StringPiece.">substr</a>(int32_t pos, int32_t len = npos)<span class="keyword"> const </span>{
<a name="l00197"></a>00197     <span class="keywordflow">return</span> <a class="code" href="classStringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>(*<span class="keyword">this</span>, pos, len);
<a name="l00198"></a>00198   }
<a name="l00199"></a>00199 };
<a name="l00200"></a>00200 
<a name="l00208"></a>00208 <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> <a class="code" href="platform_8h.html#a72bf6d8ec0640a37b1915e5d853b2016">U_EXPORT2</a> 
<a name="l00209"></a>00209 <a class="code" href="stringpiece_8h.html#a7652049cbac0bfeae2cd2aa4514a3352" title="Global operator == for StringPiece.">operator==</a>(<span class="keyword">const</span> <a class="code" href="classStringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>&amp; x, <span class="keyword">const</span> <a class="code" href="classStringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>&amp; y);
<a name="l00210"></a>00210 
<a name="l00218"></a><a class="code" href="stringpiece_8h.html#abf0ccab9536bab551afc07de65eb5d95">00218</a> <span class="keyword">inline</span> <a class="code" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5" title="The ICU boolean type.">UBool</a> <a class="code" href="stringpiece_8h.html#abf0ccab9536bab551afc07de65eb5d95" title="Global operator != for StringPiece.">operator!=</a>(<span class="keyword">const</span> <a class="code" href="classStringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>&amp; x, <span class="keyword">const</span> <a class="code" href="classStringPiece.html" title="A string-like object that points to a sized piece of memory.">StringPiece</a>&amp; y) {
<a name="l00219"></a>00219   <span class="keywordflow">return</span> !(x == y);
<a name="l00220"></a>00220 }
<a name="l00221"></a>00221 
<a name="l00222"></a>00222 <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>
<a name="l00223"></a>00223 
<a name="l00224"></a>00224 <span class="preprocessor">#endif  // __STRINGPIECE_H__</span>
</pre></div></div>
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