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<title>libstdc++: std::codecvt< wchar_t, char, mbstate_t > Class Template Reference</title>
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<div class="title">std::codecvt< wchar_t, char, mbstate_t > Class Template Reference</div> </div>
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Inheritance diagram for std::codecvt< wchar_t, char, mbstate_t >:</div>
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<div class="center"><img src="a02793.png" border="0" usemap="#std_1_1codecvt_3_01wchar__t_00_01char_00_01mbstate__t_01_4_inherit__map" alt="Inheritance graph"/></div>
<map name="std_1_1codecvt_3_01wchar__t_00_01char_00_01mbstate__t_01_4_inherit__map" id="std_1_1codecvt_3_01wchar__t_00_01char_00_01mbstate__t_01_4_inherit__map">
<area shape="rect" id="node2" href="a00003.html" title="std::__codecvt_abstract\l_base\< wchar_t, char,\l mbstate_t \>" alt="" coords="553,27,703,79"/><area shape="rect" id="node4" href="a00801.html" title="Localization functionality base class.The facet class is the base class for a localization feature..." alt="" coords="11,5,120,30"/><area shape="rect" id="node8" href="a00003.html" title="Common base for codecvt functions." alt="" coords="177,27,346,79"/><area shape="rect" id="node6" href="a00618.html" title="Empty base class for codecvt facet [22.2.1.5]." alt="" coords="5,73,125,98"/></map>
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Public Types</h2></td></tr>
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typedef char </td><td class="memItemRight" valign="bottom"><b>extern_type</b></td></tr>
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typedef wchar_t </td><td class="memItemRight" valign="bottom"><b>intern_type</b></td></tr>
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typedef codecvt_base::result </td><td class="memItemRight" valign="bottom"><b>result</b></td></tr>
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typedef mbstate_t </td><td class="memItemRight" valign="bottom"><b>state_type</b></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
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 </td><td class="memItemRight" valign="bottom"><b>codecvt</b> (size_t __refs=0)</td></tr>
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 </td><td class="memItemRight" valign="bottom"><b>codecvt</b> (__c_locale __cloc, size_t __refs=0)</td></tr>
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bool </td><td class="memItemRight" valign="bottom"><b>always_noconv</b> () const throw ()</td></tr>
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int </td><td class="memItemRight" valign="bottom"><b>encoding</b> () const throw ()</td></tr>
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<tr class="memitem:a18ef5d80a91835a38ed00754c64d414e"><td class="memItemLeft" align="right" valign="top">result </td><td class="memItemRight" valign="bottom"><a class="el" href="a00003.html#a18ef5d80a91835a38ed00754c64d414e">in</a> (state_type &__state, const extern_type *__from, const extern_type *__from_end, const extern_type *&__from_next, intern_type *__to, intern_type *__to_end, intern_type *&__to_next) const</td></tr>
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int </td><td class="memItemRight" valign="bottom"><b>length</b> (state_type &__state, const extern_type *__from, const extern_type *__end, size_t __max) const</td></tr>
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int </td><td class="memItemRight" valign="bottom"><b>max_length</b> () const throw ()</td></tr>
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<tr class="memitem:a5dba405c1b1ec4d38ce49ace96e844b8"><td class="memItemLeft" align="right" valign="top">result </td><td class="memItemRight" valign="bottom"><a class="el" href="a00003.html#a5dba405c1b1ec4d38ce49ace96e844b8">out</a> (state_type &__state, const intern_type *__from, const intern_type *__from_end, const intern_type *&__from_next, extern_type *__to, extern_type *__to_end, extern_type *&__to_next) const</td></tr>
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<tr class="memitem:a254f4ced9556f8f1b3170a47bc632975"><td class="memItemLeft" align="right" valign="top">result </td><td class="memItemRight" valign="bottom"><a class="el" href="a00003.html#a254f4ced9556f8f1b3170a47bc632975">unshift</a> (state_type &__state, extern_type *__to, extern_type *__to_end, extern_type *&__to_next) const</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-attribs"></a>
Static Public Attributes</h2></td></tr>
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static <a class="el" href="a00802.html">locale::id</a> </td><td class="memItemRight" valign="bottom"><b>id</b></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
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virtual bool </td><td class="memItemRight" valign="bottom"><b>do_always_noconv</b> () const throw ()</td></tr>
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virtual int </td><td class="memItemRight" valign="bottom"><b>do_encoding</b> () const throw ()</td></tr>
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virtual result </td><td class="memItemRight" valign="bottom"><b>do_in</b> (state_type &__state, const extern_type *__from, const extern_type *__from_end, const extern_type *&__from_next, intern_type *__to, intern_type *__to_end, intern_type *&__to_next) const </td></tr>
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virtual int </td><td class="memItemRight" valign="bottom"><b>do_length</b> (state_type &, const extern_type *__from, const extern_type *__end, size_t __max) const </td></tr>
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virtual int </td><td class="memItemRight" valign="bottom"><b>do_max_length</b> () const throw ()</td></tr>
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<tr class="memitem:ac654130b713e1aa08030744f7174ca9a"><td class="memItemLeft" align="right" valign="top">virtual result </td><td class="memItemRight" valign="bottom"><a class="el" href="a00617.html#ac654130b713e1aa08030744f7174ca9a">do_out</a> (state_type &__state, const intern_type *__from, const intern_type *__from_end, const intern_type *&__from_next, extern_type *__to, extern_type *__to_end, extern_type *&__to_next) const </td></tr>
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virtual result </td><td class="memItemRight" valign="bottom"><b>do_unshift</b> (state_type &__state, extern_type *__to, extern_type *__to_end, extern_type *&__to_next) const </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-static-methods"></a>
Static Protected Member Functions</h2></td></tr>
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static __c_locale </td><td class="memItemRight" valign="bottom"><b>_S_clone_c_locale</b> (__c_locale &__cloc) throw ()</td></tr>
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static void </td><td class="memItemRight" valign="bottom"><b>_S_create_c_locale</b> (__c_locale &__cloc, const char *__s, __c_locale __old=0)</td></tr>
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static void </td><td class="memItemRight" valign="bottom"><b>_S_destroy_c_locale</b> (__c_locale &__cloc)</td></tr>
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static __c_locale </td><td class="memItemRight" valign="bottom"><b>_S_get_c_locale</b> ()</td></tr>
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static const char * </td><td class="memItemRight" valign="bottom"><b>_S_get_c_name</b> () throw ()</td></tr>
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static __c_locale </td><td class="memItemRight" valign="bottom"><b>_S_lc_ctype_c_locale</b> (__c_locale __cloc, const char *__s)</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-attribs"></a>
Protected Attributes</h2></td></tr>
<tr class="memitem:a743204d64a9d1a6e07f9e9df69034efe"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a743204d64a9d1a6e07f9e9df69034efe"></a>
__c_locale </td><td class="memItemRight" valign="bottom"><b>_M_c_locale_codecvt</b></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<><br/>
class std::codecvt< wchar_t, char, mbstate_t ></h3>
<p>class <a class="el" href="a00617.html" title="class codecvt<wchar_t, char, mbstate_t> specialization.">codecvt<wchar_t, char, mbstate_t></a> specialization. </p>
<p>Definition at line <a class="el" href="a01044_source.html#l00399">399</a> of file <a class="el" href="a01044_source.html">codecvt.h</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">virtual result <a class="el" href="a00614.html">std::codecvt</a>< wchar_t, char, mbstate_t >::do_out </td>
<td>(</td>
<td class="paramtype">state_type & </td>
<td class="paramname"><em>__state</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const intern_type * </td>
<td class="paramname"><em>__from</em>, </td>
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<td class="paramtype">const intern_type * </td>
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<td class="paramtype">extern_type * </td>
<td class="paramname"><em>__to</em>, </td>
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<td class="paramtype">extern_type * </td>
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<td class="paramtype">extern_type *& </td>
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<td>)</td>
<td></td><td> const</td>
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<span class="mlabels"><span class="mlabel">protected</span><span class="mlabel">virtual</span></span> </td>
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<p>Convert from internal to external character set. </p>
<p>Converts input string of intern_type to output string of extern_type. This function is a hook for derived classes to change the value returned.</p>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="a00003.html#a5dba405c1b1ec4d38ce49ace96e844b8" title="Convert from internal to external character set.">out</a> for more information. </dd></dl>
<p>Implements <a class="el" href="a00003.html#aa969d1e16dd100e737c5d777aa0cdf02">std::__codecvt_abstract_base< wchar_t, char, mbstate_t ></a>.</p>
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<td class="memname">result <a class="el" href="a00003.html">std::__codecvt_abstract_base</a>< wchar_t , char , mbstate_t >::in </td>
<td>(</td>
<td class="paramtype">state_type & </td>
<td class="paramname"><em>__state</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const extern_type * </td>
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<td class="paramtype">const extern_type * </td>
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<td class="paramtype">intern_type *& </td>
<td class="paramname"><em>__to_next</em> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td> const</td>
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<p>Convert from external to internal character set. </p>
<p>Converts input string of extern_type to output string of intern_type. This is analogous to mbsrtowcs. It does this by calling codecvt::do_in.</p>
<p>The source and destination character sets are determined by the facet's locale, internal and external types.</p>
<p>The characters in [from,from_end) are converted and written to [to,to_end). from_next and to_next are set to point to the character following the last successfully converted character, respectively. If the result needed no conversion, from_next and to_next are not affected.</p>
<p>The <em>state</em> argument should be initialized if the input is at the beginning and carried from a previous call if continuing conversion. There are no guarantees about how <em>state</em> is used.</p>
<p>The result returned is a member of codecvt_base::result. If all the input is converted, returns codecvt_base::ok. If no conversion is necessary, returns codecvt_base::noconv. If the input ends early or there is insufficient space in the output, returns codecvt_base::partial. Otherwise the conversion failed and codecvt_base::error is returned.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__state</td><td>Persistent conversion state data. </td></tr>
<tr><td class="paramname">__from</td><td>Start of input. </td></tr>
<tr><td class="paramname">__from_end</td><td>End of input. </td></tr>
<tr><td class="paramname">__from_next</td><td>Returns start of unconverted data. </td></tr>
<tr><td class="paramname">__to</td><td>Start of output buffer. </td></tr>
<tr><td class="paramname">__to_end</td><td>End of output buffer. </td></tr>
<tr><td class="paramname">__to_next</td><td>Returns start of unused output area. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>codecvt_base::result. </dd></dl>
<p>Definition at line <a class="el" href="a01044_source.html#l00197">197</a> of file <a class="el" href="a01044_source.html">codecvt.h</a>.</p>
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<td class="memname">result <a class="el" href="a00003.html">std::__codecvt_abstract_base</a>< wchar_t , char , mbstate_t >::out </td>
<td>(</td>
<td class="paramtype">state_type & </td>
<td class="paramname"><em>__state</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const intern_type * </td>
<td class="paramname"><em>__from</em>, </td>
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<td></td>
<td class="paramtype">const intern_type * </td>
<td class="paramname"><em>__from_end</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const intern_type *& </td>
<td class="paramname"><em>__from_next</em>, </td>
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<td class="paramtype">extern_type * </td>
<td class="paramname"><em>__to</em>, </td>
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<td class="paramtype">extern_type * </td>
<td class="paramname"><em>__to_end</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">extern_type *& </td>
<td class="paramname"><em>__to_next</em> </td>
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<td>)</td>
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<p>Convert from internal to external character set. </p>
<p>Converts input string of intern_type to output string of extern_type. This is analogous to wcsrtombs. It does this by calling codecvt::do_out.</p>
<p>The source and destination character sets are determined by the facet's locale, internal and external types.</p>
<p>The characters in [from,from_end) are converted and written to [to,to_end). from_next and to_next are set to point to the character following the last successfully converted character, respectively. If the result needed no conversion, from_next and to_next are not affected.</p>
<p>The <em>state</em> argument should be initialized if the input is at the beginning and carried from a previous call if continuing conversion. There are no guarantees about how <em>state</em> is used.</p>
<p>The result returned is a member of codecvt_base::result. If all the input is converted, returns codecvt_base::ok. If no conversion is necessary, returns codecvt_base::noconv. If the input ends early or there is insufficient space in the output, returns codecvt_base::partial. Otherwise the conversion failed and codecvt_base::error is returned.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__state</td><td>Persistent conversion state data. </td></tr>
<tr><td class="paramname">__from</td><td>Start of input. </td></tr>
<tr><td class="paramname">__from_end</td><td>End of input. </td></tr>
<tr><td class="paramname">__from_next</td><td>Returns start of unconverted data. </td></tr>
<tr><td class="paramname">__to</td><td>Start of output buffer. </td></tr>
<tr><td class="paramname">__to_end</td><td>End of output buffer. </td></tr>
<tr><td class="paramname">__to_next</td><td>Returns start of unused output area. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>codecvt_base::result. </dd></dl>
<p>Definition at line <a class="el" href="a01044_source.html#l00117">117</a> of file <a class="el" href="a01044_source.html">codecvt.h</a>.</p>
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<td class="memname">result <a class="el" href="a00003.html">std::__codecvt_abstract_base</a>< wchar_t , char , mbstate_t >::unshift </td>
<td>(</td>
<td class="paramtype">state_type & </td>
<td class="paramname"><em>__state</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
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<td class="paramtype">extern_type * </td>
<td class="paramname"><em>__to</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">extern_type * </td>
<td class="paramname"><em>__to_end</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">extern_type *& </td>
<td class="paramname"><em>__to_next</em> </td>
</tr>
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<td></td>
<td>)</td>
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<p>Reset conversion state. </p>
<p>Writes characters to output that would restore <em>state</em> to initial conditions. The idea is that if a partial conversion occurs, then the converting the characters written by this function would leave the state in initial conditions, rather than partial conversion state. It does this by calling codecvt::do_unshift().</p>
<p>For example, if 4 external characters always converted to 1 internal character, and input to in() had 6 external characters with state saved, this function would write two characters to the output and set the state to initialized conditions.</p>
<p>The source and destination character sets are determined by the facet's locale, internal and external types.</p>
<p>The result returned is a member of codecvt_base::result. If the state could be reset and data written, returns codecvt_base::ok. If no conversion is necessary, returns codecvt_base::noconv. If the output has insufficient space, returns codecvt_base::partial. Otherwise the reset failed and codecvt_base::error is returned.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">__state</td><td>Persistent conversion state data. </td></tr>
<tr><td class="paramname">__to</td><td>Start of output buffer. </td></tr>
<tr><td class="paramname">__to_end</td><td>End of output buffer. </td></tr>
<tr><td class="paramname">__to_next</td><td>Returns start of unused output area. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>codecvt_base::result. </dd></dl>
<p>Definition at line <a class="el" href="a01044_source.html#l00156">156</a> of file <a class="el" href="a01044_source.html">codecvt.h</a>.</p>
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</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="a01044_source.html">codecvt.h</a></li>
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