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<li class="navelem"><a class="el" href="namespaceicu.html">icu</a></li><li class="navelem"><a class="el" href="classicu_1_1Appendable.html">Appendable</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> </div>
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<div class="title">icu::Appendable Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<p>Base class for objects to which Unicode characters and strings can be appended.
<a href="classicu_1_1Appendable.html#details">More...</a></p>
<p><code>#include <<a class="el" href="appendable_8h_source.html">appendable.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for icu::Appendable:</div>
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<div class="center">
<img src="classicu_1_1Appendable.png" usemap="#icu::Appendable_map" alt=""/>
<map id="icu::Appendable_map" name="icu::Appendable_map">
<area href="classicu_1_1UObject.html" title="UObject is the common ICU "boilerplate" class. " alt="icu::UObject" shape="rect" coords="0,56,182,80"/>
<area href="classicu_1_1UMemory.html" title="UMemory is the common ICU base class. " alt="icu::UMemory" shape="rect" coords="0,0,182,24"/>
<area href="classicu_1_1UnicodeStringAppendable.html" title="An Appendable implementation which writes to a UnicodeString. " alt="icu::UnicodeStringAppendable" shape="rect" coords="0,168,182,192"/>
</map>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:aefa9d25b0e9f45239a7e9b1dc7135002"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1Appendable.html#aefa9d25b0e9f45239a7e9b1dc7135002">~Appendable</a> ()</td></tr>
<tr class="memdesc:aefa9d25b0e9f45239a7e9b1dc7135002"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <a href="#aefa9d25b0e9f45239a7e9b1dc7135002">More...</a><br /></td></tr>
<tr class="separator:aefa9d25b0e9f45239a7e9b1dc7135002"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1d890cd611df282081bee62280a353d9"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5">UBool</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1Appendable.html#a1d890cd611df282081bee62280a353d9">appendCodeUnit</a> (char16_t c)=0</td></tr>
<tr class="memdesc:a1d890cd611df282081bee62280a353d9"><td class="mdescLeft"> </td><td class="mdescRight">Appends a 16-bit code unit. <a href="#a1d890cd611df282081bee62280a353d9">More...</a><br /></td></tr>
<tr class="separator:a1d890cd611df282081bee62280a353d9"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab6ebdf003f35a831577f7a4a297b826e"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5">UBool</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1Appendable.html#ab6ebdf003f35a831577f7a4a297b826e">appendCodePoint</a> (<a class="el" href="umachine_8h.html#a09fff5c3b5a5b015324dc3ec3cf92809">UChar32</a> c)</td></tr>
<tr class="memdesc:ab6ebdf003f35a831577f7a4a297b826e"><td class="mdescLeft"> </td><td class="mdescRight">Appends a code point. <a href="#ab6ebdf003f35a831577f7a4a297b826e">More...</a><br /></td></tr>
<tr class="separator:ab6ebdf003f35a831577f7a4a297b826e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a37b2658c6ed3a31e09d10d0cf088bfba"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5">UBool</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1Appendable.html#a37b2658c6ed3a31e09d10d0cf088bfba">appendString</a> (const char16_t *s, int32_t length)</td></tr>
<tr class="memdesc:a37b2658c6ed3a31e09d10d0cf088bfba"><td class="mdescLeft"> </td><td class="mdescRight">Appends a string. <a href="#a37b2658c6ed3a31e09d10d0cf088bfba">More...</a><br /></td></tr>
<tr class="separator:a37b2658c6ed3a31e09d10d0cf088bfba"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a1950ff25060fe2549160b65cb6a08f95"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5">UBool</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1Appendable.html#a1950ff25060fe2549160b65cb6a08f95">reserveAppendCapacity</a> (int32_t appendCapacity)</td></tr>
<tr class="memdesc:a1950ff25060fe2549160b65cb6a08f95"><td class="mdescLeft"> </td><td class="mdescRight">Tells the object that the caller is going to append roughly appendCapacity char16_ts. <a href="#a1950ff25060fe2549160b65cb6a08f95">More...</a><br /></td></tr>
<tr class="separator:a1950ff25060fe2549160b65cb6a08f95"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:abc3d483ac1df5387721b2c2aa768a580"><td class="memItemLeft" align="right" valign="top">virtual char16_t * </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1Appendable.html#abc3d483ac1df5387721b2c2aa768a580">getAppendBuffer</a> (int32_t minCapacity, int32_t desiredCapacityHint, char16_t *scratch, int32_t scratchCapacity, int32_t *resultCapacity)</td></tr>
<tr class="memdesc:abc3d483ac1df5387721b2c2aa768a580"><td class="mdescLeft"> </td><td class="mdescRight">Returns a writable buffer for appending and writes the buffer's capacity to *resultCapacity. <a href="#abc3d483ac1df5387721b2c2aa768a580">More...</a><br /></td></tr>
<tr class="separator:abc3d483ac1df5387721b2c2aa768a580"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_classicu_1_1UObject"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classicu_1_1UObject')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classicu_1_1UObject.html">icu::UObject</a></td></tr>
<tr class="memitem:af10026497704f510d3d1f2eff50acb18 inherit pub_methods_classicu_1_1UObject"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1UObject.html#af10026497704f510d3d1f2eff50acb18">~UObject</a> ()</td></tr>
<tr class="memdesc:af10026497704f510d3d1f2eff50acb18 inherit pub_methods_classicu_1_1UObject"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <a href="classicu_1_1UObject.html#af10026497704f510d3d1f2eff50acb18">More...</a><br /></td></tr>
<tr class="separator:af10026497704f510d3d1f2eff50acb18 inherit pub_methods_classicu_1_1UObject"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aca1169c4978c52ce2b76eda104e9a214 inherit pub_methods_classicu_1_1UObject"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="uobject_8h.html#a22af10545208a455a6e884008df48e9f">UClassID</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classicu_1_1UObject.html#aca1169c4978c52ce2b76eda104e9a214">getDynamicClassID</a> () const</td></tr>
<tr class="memdesc:aca1169c4978c52ce2b76eda104e9a214 inherit pub_methods_classicu_1_1UObject"><td class="mdescLeft"> </td><td class="mdescRight">ICU4C "poor man's RTTI", returns a UClassID for the actual ICU class. <a href="classicu_1_1UObject.html#aca1169c4978c52ce2b76eda104e9a214">More...</a><br /></td></tr>
<tr class="separator:aca1169c4978c52ce2b76eda104e9a214 inherit pub_methods_classicu_1_1UObject"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Base class for objects to which Unicode characters and strings can be appended. </p>
<p>Combines elements of Java <a class="el" href="classicu_1_1Appendable.html" title="Base class for objects to which Unicode characters and strings can be appended. ">Appendable</a> and ICU4C <a class="el" href="classicu_1_1ByteSink.html" title="A ByteSink can be filled with bytes. ">ByteSink</a>.</p>
<p>This class can be used in APIs where it does not matter whether the actual destination is a <a class="el" href="classicu_1_1UnicodeString.html" title="UnicodeString is a string class that stores Unicode characters directly and provides similar function...">UnicodeString</a>, a char16_t[] array, a <a class="el" href="classicu_1_1UnicodeSet.html" title="A mutable set of Unicode characters and multicharacter strings. ">UnicodeSet</a>, or any other object that receives and processes characters and/or strings.</p>
<p>Implementation classes must implement at least <a class="el" href="classicu_1_1Appendable.html#a1d890cd611df282081bee62280a353d9" title="Appends a 16-bit code unit. ">appendCodeUnit(char16_t)</a>. The base class provides default implementations for the other methods.</p>
<p>The methods do not take UErrorCode parameters. If an error occurs (e.g., out-of-memory), in addition to returning false from failing operations, the implementation must prevent unexpected behavior (e.g., crashes) from further calls and should make the error condition available separately (e.g., store a UErrorCode, make/keep a <a class="el" href="classicu_1_1UnicodeString.html" title="UnicodeString is a string class that stores Unicode characters directly and provides similar function...">UnicodeString</a> bogus). </p><dl class="stable"><dt><b><a class="el" href="stable.html#_stable000001">Stable:</a></b></dt><dd>ICU 4.8 </dd></dl>
<p class="definition">Definition at line <a class="el" href="appendable_8h_source.html#l00054">54</a> of file <a class="el" href="appendable_8h_source.html">appendable.h</a>.</p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aefa9d25b0e9f45239a7e9b1dc7135002">◆ </a></span>~Appendable()</h2>
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<td class="memname">icu::Appendable::~Appendable </td>
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<p>Destructor. </p>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000003">Stable:</a></b></dt><dd>ICU 4.8 </dd></dl>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ab6ebdf003f35a831577f7a4a297b826e">◆ </a></span>appendCodePoint()</h2>
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<td class="memname">virtual <a class="el" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5">UBool</a> icu::Appendable::appendCodePoint </td>
<td>(</td>
<td class="paramtype"><a class="el" href="umachine_8h.html#a09fff5c3b5a5b015324dc3ec3cf92809">UChar32</a> </td>
<td class="paramname"><em>c</em></td><td>)</td>
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<p>Appends a code point. </p>
<p>The default implementation calls <a class="el" href="classicu_1_1Appendable.html#a1d890cd611df282081bee62280a353d9" title="Appends a 16-bit code unit. ">appendCodeUnit(char16_t)</a> once or twice. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">c</td><td>code point 0..0x10ffff </td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>true if the operation succeeded </dd></dl>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000005">Stable:</a></b></dt><dd>ICU 4.8 </dd></dl>
<p>Reimplemented in <a class="el" href="classicu_1_1UnicodeStringAppendable.html#a5eda9b6627105a19d46afd16d8b8e2df">icu::UnicodeStringAppendable</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1d890cd611df282081bee62280a353d9">◆ </a></span>appendCodeUnit()</h2>
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<td class="memname">virtual <a class="el" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5">UBool</a> icu::Appendable::appendCodeUnit </td>
<td>(</td>
<td class="paramtype">char16_t </td>
<td class="paramname"><em>c</em></td><td>)</td>
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<p>Appends a 16-bit code unit. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">c</td><td>code unit </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>true if the operation succeeded </dd></dl>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000004">Stable:</a></b></dt><dd>ICU 4.8 </dd></dl>
<p>Implemented in <a class="el" href="classicu_1_1UnicodeStringAppendable.html#ae51c517e4a93f9623933d98cd7f22d79">icu::UnicodeStringAppendable</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a37b2658c6ed3a31e09d10d0cf088bfba">◆ </a></span>appendString()</h2>
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<td class="memname">virtual <a class="el" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5">UBool</a> icu::Appendable::appendString </td>
<td>(</td>
<td class="paramtype">const char16_t * </td>
<td class="paramname"><em>s</em>, </td>
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<td class="paramtype">int32_t </td>
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<p>Appends a string. </p>
<p>The default implementation calls <a class="el" href="classicu_1_1Appendable.html#a1d890cd611df282081bee62280a353d9" title="Appends a 16-bit code unit. ">appendCodeUnit(char16_t)</a> for each code unit. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">s</td><td>string, must not be nullptr if length!=0 </td></tr>
<tr><td class="paramname">length</td><td>string length, or -1 if NUL-terminated </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>true if the operation succeeded </dd></dl>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000006">Stable:</a></b></dt><dd>ICU 4.8 </dd></dl>
<p>Reimplemented in <a class="el" href="classicu_1_1UnicodeStringAppendable.html#a7eb0cd79d53149a137b1d9007207b4d4">icu::UnicodeStringAppendable</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#abc3d483ac1df5387721b2c2aa768a580">◆ </a></span>getAppendBuffer()</h2>
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<td class="memname">virtual char16_t* icu::Appendable::getAppendBuffer </td>
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<td class="paramtype">int32_t </td>
<td class="paramname"><em>minCapacity</em>, </td>
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<td class="paramtype">int32_t * </td>
<td class="paramname"><em>resultCapacity</em> </td>
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<p>Returns a writable buffer for appending and writes the buffer's capacity to *resultCapacity. </p>
<p>Guarantees *resultCapacity>=minCapacity. May return a pointer to the caller-owned scratch buffer which must have scratchCapacity>=minCapacity. The returned buffer is only valid until the next operation on this <a class="el" href="classicu_1_1Appendable.html" title="Base class for objects to which Unicode characters and strings can be appended. ">Appendable</a>.</p>
<p>After writing at most *resultCapacity char16_ts, call <a class="el" href="classicu_1_1Appendable.html#a37b2658c6ed3a31e09d10d0cf088bfba" title="Appends a string. ">appendString()</a> with the pointer returned from this function and the number of char16_ts written. Many <a class="el" href="classicu_1_1Appendable.html#a37b2658c6ed3a31e09d10d0cf088bfba" title="Appends a string. ">appendString()</a> implementations will avoid copying char16_ts if this function returned an internal buffer.</p>
<p>Partial usage example: </p><div class="fragment"><div class="line">int32_t capacity;</div><div class="line">char16_t* buffer = app.getAppendBuffer(..., &capacity);</div><div class="line">... Write n char16_ts into buffer, with n <= capacity.</div><div class="line">app.appendString(buffer, n);</div></div><!-- fragment --><p> In many implementations, that call to append will avoid copying char16_ts.</p>
<p>If the <a class="el" href="classicu_1_1Appendable.html" title="Base class for objects to which Unicode characters and strings can be appended. ">Appendable</a> allocates or reallocates an internal buffer, it should use the desiredCapacityHint if appropriate. If a caller cannot provide a reasonable guess at the desired capacity, it should pass desiredCapacityHint=0.</p>
<p>If a non-scratch buffer is returned, the caller may only pass a prefix to it to <a class="el" href="classicu_1_1Appendable.html#a37b2658c6ed3a31e09d10d0cf088bfba" title="Appends a string. ">appendString()</a>. That is, it is not correct to pass an interior pointer to <a class="el" href="classicu_1_1Appendable.html#a37b2658c6ed3a31e09d10d0cf088bfba" title="Appends a string. ">appendString()</a>.</p>
<p>The default implementation always returns the scratch buffer.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">minCapacity</td><td>required minimum capacity of the returned buffer; must be non-negative </td></tr>
<tr><td class="paramname">desiredCapacityHint</td><td>desired capacity of the returned buffer; must be non-negative </td></tr>
<tr><td class="paramname">scratch</td><td>default caller-owned buffer </td></tr>
<tr><td class="paramname">scratchCapacity</td><td>capacity of the scratch buffer </td></tr>
<tr><td class="paramname">resultCapacity</td><td>pointer to an integer which will be set to the capacity of the returned buffer </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>a buffer with *resultCapacity>=minCapacity </dd></dl>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000008">Stable:</a></b></dt><dd>ICU 4.8 </dd></dl>
<p>Reimplemented in <a class="el" href="classicu_1_1UnicodeStringAppendable.html#a6d03ca67ad2af7b99e5d9d2a71265520">icu::UnicodeStringAppendable</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1950ff25060fe2549160b65cb6a08f95">◆ </a></span>reserveAppendCapacity()</h2>
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<td class="memname">virtual <a class="el" href="umachine_8h.html#a349ef00011f20ccd1d3b424445681aa5">UBool</a> icu::Appendable::reserveAppendCapacity </td>
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<td class="paramtype">int32_t </td>
<td class="paramname"><em>appendCapacity</em></td><td>)</td>
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<p>Tells the object that the caller is going to append roughly appendCapacity char16_ts. </p>
<p>A subclass might use this to pre-allocate a larger buffer if necessary. The default implementation does nothing. (It always returns true.) </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">appendCapacity</td><td>estimated number of char16_ts that will be appended </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>true if the operation succeeded </dd></dl>
<dl class="stable"><dt><b><a class="el" href="stable.html#_stable000007">Stable:</a></b></dt><dd>ICU 4.8 </dd></dl>
<p>Reimplemented in <a class="el" href="classicu_1_1UnicodeStringAppendable.html#a36d75b8416413f6fa94f09c5bea3f06a">icu::UnicodeStringAppendable</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>common/unicode/<a class="el" href="appendable_8h_source.html">appendable.h</a></li>
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