📄 ctype.htm
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<title>ctype</title>
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<pre>
<font size=5>Class Name</font> ctype
<font size=5>Header File</font> <locale>
<font size=5>Classification</font> abstract data type
</pre>
<a href="ctype.htm#crd">Class Relationship Diagram</a><br>
<br>
<a href="ctype.htm#class-descrip">Class Description</a>
<h1>Member Classes</h1>
<a href="ctype.htm#id">locale::id</a>
<h1>Methods</h1>
<pre>
<a href="ctype.htm#ctype">
explicit ctype(size_t refs = 0);</a>
<a href="ctype.htm#~ctype">
~ctype();</a>
<a href="ctype.htm#do-is1">
virtual bool do_is(mask m, charT c) const;</a>
<a href="ctype.htm#do-is2">
virtual const charT* do_is(const charT* low, const charT* high,
mask* vec) const;</a>
<a href="ctype.htm#do-scan-is">
virtual const charT* do_scan_is(mask m, const charT* low,
const charT* high) const;</a>
<a href="ctype.htm#do-scan-not">
virtual const charT* do_scan_not(mask m, const charT* low,
const charT* high) const;</a>
<a href="ctype.htm#do-narrow1">
virtual char do_narrow(charT, char dfault) const;</a>
<a href="ctype.htm#do-narrow2">
virtual const charT* do_narrow(const charT* low, const charT* high,
char dfault, char* dest) const;</a>
<a href="ctype.htm#do-tolower1">
virtual charT do_tolower(charT c) const;</a>
<a href="ctype.htm#do-tolower2">
virtual const charT* do_tolower(charT* low, const charT* high) const;</a>
<a href="ctype.htm#do-toupper1">
virtual charT do_toupper(charT c) const;</a>
<a href="ctype.htm#do-toupper2">
virtual const charT* do_toupper(charT* low, const charT* high) const;</a>
<a href="ctype.htm#do-widen1">
virtual charT do_widen(char) const;</a>
<a href="ctype.htm#do-widen2">
virtual const char* do_widen(const char* low, const char* high,
charT* dest) const;</a>
<a href="ctype.htm#is1">
bool is(mask m, charT c) const;</a>
<a href="ctype.htm#is2">
const charT* is(const charT* low, const charT* high, mask* vec) const;</a>
<a href="ctype.htm#narrow1">
char narrow(charT c, char dfault) const;</a>
<a href="ctype.htm#narrow2">
const charT* narrow(const charT* low, const charT*, char dfault,
char* to) const;</a>
<a href="ctype.htm#scan-is">
const charT* scan_is(mask m, const charT* low, const charT* high) const;</a>
<a href="ctype.htm#scan-not">
const charT* scan_not(mask m, const charT* low, const charT* high) const;</a>
<a href="ctype.htm#tolower1">
charT tolower(charT c) const;</a>
<a href="ctype.htm#tolower2">
const charT* tolower(charT* low, const charT* high) const;</a>
<a href="ctype.htm#toupper1">
charT toupper(charT) const;</a>
<a href="ctype.htm#toupper2">
const charT* toupper(charT* low, const charT* high) const;</a>
<a href="ctype.htm#widen1">
charT widen(char c) const;</a>
<a href="ctype.htm#widen2">
const char* widen(const char* low, const char* high, charT* to) const;</a>
</pre>
<hr>
<a name="class-descrip"><h3>Class Description</h3></a>
<p>
The ctype template class describes a class used to provide character classifications
and simple conversions.
</p>
<hr>
<a name="id"><h3>locale::id</h3></a>
<p>
locale::id is a class used to provide an identification of a locale facet interfaces used as
an index for lookup and to encapsulate initialization.
</p>
<hr>
<pre>
<a name="ctype">
Method ctype()</a>
Access Public
Classification Constructor
Syntax explicit ctype(size_t refs = 0);
Parmeters <em>refs</em>, if the refs argument = 0 then the destruction
of the object is delegated to the locale or locales
which contain it. If refs = 1 then the object must
be explicitly deleted. The locale will not delete it.
The object can then be maintained across the lifetime
of multiple locales.
Returns None
</pre>
<h3>Description</h3>
<p>
This constructor constructs a ctype facet object.
</p>
<hr>
<pre>
<a name="~ctype">
Method ctype()</a>
Access Protected
Classification Destructor
Syntax ~ctype();
Parmeters None
Returns None
</pre>
<h3>Description</h3>
<p>
The destructor destroys a ctype facet object.
</p>
<hr>
<pre>
<a name="do-is1">
Method do_is()</a>
Access Protected
Classification Accessor
Syntax virtual bool do_is(mask m, charT c) const;
Parameters <em>m</em> is one of the mask available from the ctype_base.
<em>c</em> is the character to be classified.
Return This method returns true if the character matches the
classification indicated by the mask.
</pre>
<h3>Description</h3>
<p>
The do_is() method classifies a character. The method determines if the character
matches the classification indicated by the mask argument <em>m</em>. It returns
true if the character matches the classification indicated by the mask.
</p>
<hr>
<pre>
<a name="do-is2">
Method do_is()</a>
Access Protected
Classification Accessor
Syntax virtual const charT* do_is(const charT* low,
const charT* high,
mask* vec) const;
Parameters <em>low</em> is the beginning of a sequence of characters.
<em>high</em> is the end of a sequence of characters.
<em>vec</em> is a vector of masks.
Return This method returns the high argument.
</pre>
<h3>Description</h3>
<p>
The do_is() method classifies a sequence of characters. The method fills <em>vec</em> with
every mask from the ctype_base and applies it to the sequence of characters in the
range [low, high).
</p>
<hr>
<pre>
<a name="do-scan-is">
Method do_scan_is()</a>
Access Protected
Classification Accessor
Syntax virtual const charT* do_scan_is(mask m,
const charT* low,
const charT* high) const;
Parameters <em>m</em> is one of the mask available from the ctype_base.
<em>low</em> is the beginning of a sequence of characters.
<em>high</em> is the end of a sequence of characters.
Returns This method returns the first character in the
range that matches the classification indicated
by the mask m.
</pre>
<h3>Description</h3>
<p>
The do_scan_is() method locates a character in the range [low, high) that
conforms to the classification indicated by the mask argument <em>m</em>.
This method returns the first character in the range that matches the
classification indicated by the mask <em>m</em>. If the character is not in
the range <em>high</em> is returned.
</p>
<hr>
<pre>
<a name="do-scan-not">
Method do_scan_not()</a>
Access Protected
Classification Accessor
Syntax virtual const charT* do_scan_not(mask m,
const charT* low,
const charT* high) const;
Parameters <em>m</em> is one of the mask available from the ctype_base.
<em>low</em> is the beginning of a sequence of characters.
<em>high</em> is the end of a sequence of characters.
Returns This method returns the first character in the
range that does not match the classification
indicated by the mask m.
</pre>
<h3>Description</h3>
<p>
The do_scan_is() method locates a character in the range [low, high) that
does not conform to the classification indicated by the mask argument <em>m</em>.
This method returns the first character in the range that does not match the
classification indicated by the mask <em>m</em>. If the character is not in
the range <em>high</em> is returned.
</p>
<hr>
<pre>
<a name="do-narrow1">
Method do_narrow()</a>
Access Protected
Classification Modifier
Syntax virtual char do_narrow(charT c, char dfault) const;
Parameters <em>c</em> is the character to be transformed.
<em>dfault</em> is character that is returned if no
transformation takes places.
Returns This method returns the transformed value or
dfault if no transformation takes place.
</pre>
<h3>Description</h3>
<p>
The do_narrow() method applies the simplest transformation from a charT value
to the corresponding char value if it exist. The method returns the transformed
value or returns the <em>dfault</em> argument if no transformation is possible.
</p>
<hr>
<pre>
<a name="do-narrow2">
Method do_narrow()</a>
Access Protected
Classification Modifier
Syntax virtual const charT* do_narrow(const charT* low,
const charT* high,
char dfault,
char* dest) const;
Parameters <em>low</em> is the beginning of a sequence of
characters.
<em>high</em> is the end of a sequence of
characters.
<em>dfault</em> is used as a default transformation.
<em>dest</em> is the destination of the results.
Returns This method returns high.
</pre>
<h3>Description</h3>
<p>
The do_narrow() method applies the simplest transformation from a sequence of charT
values to the corresponding char values if they exist. If no simple transformation
is possible then <em>dfault</em> is used. The method returns the transformed
values in <em>dest</em> argument.
</p>
<hr>
<pre>
<a name="do-tolower1">
Method do_tolower()</a>
Access Protected
Classification Modifier
Syntax virtual charT do_tolower(charT c) const;
Parameters <em>c</em> is the character to be converted.
Returns This method returns the converted character.
</pre>
<h3>Description</h3>
<p>
The do_tolower() method converts the character argument <em>c</em> to
lower case. The method returns the converted character. If no conversion is
possible the argument is returned.
</p>
<hr>
<pre>
<a name="do-tolower2">
Method do_tolower()</a>
Access Protected
Classification Modifier
Syntax virtual charT do_tolower(charT* low,
const charT* high) const;
Parameters <em>low</em> is the beginning of a sequence of
characters.
<em>high</em> is the end of a sequence of
characters.
Returns This method returns high.
</pre>
<h3>Description</h3>
<p>
The do_tolower() method converts each character in the character sequence
[low, high) argument to lower case. Each character in the range is replaced
with the lower case character. The method returns <em>high</em>.
</p>
<hr>
<pre>
<a name="do-toupper1">
Method do_toupper()</a>
Access Protected
Classification Modifier
Syntax virtual charT do_toupper(charT c) const;
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