libstdc++
std::ctype< char > Class Reference
Inheritance diagram for std::ctype< char >:
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Public Types

typedef const int * __to_type
 
typedef char char_type
 
typedef unsigned short mask
 

Public Member Functions

 ctype (__c_locale __cloc, const mask *__table=0, bool __del=false, size_t __refs=0)
 
 ctype (const mask *__table=0, bool __del=false, size_t __refs=0)
 
const char * is (const char *__lo, const char *__hi, mask *__vec) const
 
bool is (mask __m, char __c) const
 
char narrow (char_type __c, char __dfault) const
 
const char_typenarrow (const char_type *__lo, const char_type *__hi, char __dfault, char *__to) const
 
const char * scan_is (mask __m, const char *__lo, const char *__hi) const
 
const char * scan_not (mask __m, const char *__lo, const char *__hi) const
 
const mask * table () const throw ()
 
const char_typetolower (char_type *__lo, const char_type *__hi) const
 
char_type tolower (char_type __c) const
 
const char_typetoupper (char_type *__lo, const char_type *__hi) const
 
char_type toupper (char_type __c) const
 
char_type widen (char __c) const
 
const char * widen (const char *__lo, const char *__hi, char_type *__to) const
 

Static Public Member Functions

static const mask * classic_table () throw ()
 

Static Public Attributes

static const mask alnum
 
static const mask alpha
 
static const mask blank
 
static const mask cntrl
 
static const mask digit
 
static const mask graph
 
static locale::id id
 
static const mask lower
 
static const mask print
 
static const mask punct
 
static const mask space
 
static const size_t table_size
 
static const mask upper
 
static const mask xdigit
 

Protected Member Functions

virtual ~ctype ()
 
virtual char do_narrow (char_type __c, char __dfault) const
 
virtual const char_typedo_narrow (const char_type *__lo, const char_type *__hi, char __dfault, char *__to) const
 
virtual const char_typedo_tolower (char_type *__lo, const char_type *__hi) const
 
virtual char_type do_tolower (char_type __c) const
 
virtual const char_typedo_toupper (char_type *__lo, const char_type *__hi) const
 
virtual char_type do_toupper (char_type __c) const
 
virtual char_type do_widen (char __c) const
 
virtual const char * do_widen (const char *__lo, const char *__hi, char_type *__to) const
 

Static Protected Member Functions

static __c_locale _S_clone_c_locale (__c_locale &__cloc) throw ()
 
static void _S_create_c_locale (__c_locale &__cloc, const char *__s, __c_locale __old=0)
 
static void _S_destroy_c_locale (__c_locale &__cloc)
 
static __c_locale _S_get_c_locale ()
 
static const char * _S_get_c_name () throw ()
 
static __c_locale _S_lc_ctype_c_locale (__c_locale __cloc, const char *__s)
 

Protected Attributes

__c_locale _M_c_locale_ctype
 
bool _M_del
 
char _M_narrow [1+static_cast< unsigned char >(-1)]
 
char _M_narrow_ok
 
const mask * _M_table
 
__to_type _M_tolower
 
__to_type _M_toupper
 
char _M_widen [1+static_cast< unsigned char >(-1)]
 
char _M_widen_ok
 

Detailed Description

The ctype<char> specialization.

This class defines classification and conversion functions for the char type. It gets used by char streams for many I/O operations. The char specialization provides a number of optimizations as well.

Definition at line 681 of file locale_facets.h.

Member Typedef Documentation

◆ char_type

typedef char std::ctype< char >::char_type

Typedef for the template parameter char.

Definition at line 686 of file locale_facets.h.

Constructor & Destructor Documentation

◆ ctype() [1/2]

std::ctype< char >::ctype ( const mask *  __table = 0,
bool  __del = false,
size_t  __refs = 0 
)
explicit

Constructor performs initialization.

This is the constructor provided by the standard.

Parameters
__tableIf non-zero, table is used as the per-char mask. Else classic_table() is used.
__delIf true, passes ownership of table to this facet.
__refsPassed to the base facet class.

◆ ctype() [2/2]

std::ctype< char >::ctype ( __c_locale  __cloc,
const mask *  __table = 0,
bool  __del = false,
size_t  __refs = 0 
)
explicit

Constructor performs static initialization.

This constructor is used to construct the initial C locale facet.

Parameters
__clocHandle to C locale data.
__tableIf non-zero, table is used as the per-char mask.
__delIf true, passes ownership of table to this facet.
__refsPassed to the base facet class.

◆ ~ctype()

virtual std::ctype< char >::~ctype ( )
protectedvirtual

Destructor.

This function deletes table() if del was true in the constructor.

Member Function Documentation

◆ classic_table()

static const mask* std::ctype< char >::classic_table ( )
throw (
)
static

Returns a pointer to the C locale mask table.

◆ do_narrow() [1/2]

virtual char std::ctype< char >::do_narrow ( char_type  __c,
char  __dfault 
) const
inlineprotectedvirtual

Narrow char.

This virtual function converts the char to char using the simplest reasonable transformation. If the conversion fails, dfault is returned instead. For an underived ctype<char> facet, c will be returned unchanged.

do_narrow() is a hook for a derived facet to change the behavior of narrowing. do_narrow() must always return the same result for the same input.

Note: this is not what you want for codepage conversions. See codecvt for that.

Parameters
__cThe char to convert.
__dfaultChar to return if conversion fails.
Returns
The converted char.

Definition at line 1134 of file locale_facets.h.

◆ do_narrow() [2/2]

virtual const char_type* std::ctype< char >::do_narrow ( const char_type __lo,
const char_type __hi,
char  __dfault,
char *  __to 
) const
inlineprotectedvirtual

Narrow char array to char array.

This virtual function converts each char in the range [lo,hi) to char using the simplest reasonable transformation and writes the results to the destination array. For any char in the input that cannot be converted, dfault is used instead. For an underived ctype<char> facet, the argument will be copied unchanged.

do_narrow() is a hook for a derived facet to change the behavior of narrowing. do_narrow() must always return the same result for the same input.

Note: this is not what you want for codepage conversions. See codecvt for that.

Parameters
__loPointer to start of range.
__hiPointer to end of range.
__dfaultChar to use if conversion fails.
__toPointer to the destination array.
Returns
__hi.

Definition at line 1160 of file locale_facets.h.

◆ do_tolower() [1/2]

virtual const char_type* std::ctype< char >::do_tolower ( char_type __lo,
const char_type __hi 
) const
protectedvirtual

Convert array to lowercase.

This virtual function converts each char in the range [lo,hi) to lowercase if possible. Other chars remain untouched.

do_tolower() is a hook for a derived facet to change the behavior of lowercasing. do_tolower() must always return the same result for the same input.

Parameters
__loPointer to first char in range.
__hiPointer to end of range.
Returns
__hi.

◆ do_tolower() [2/2]

virtual char_type std::ctype< char >::do_tolower ( char_type  __c) const
protectedvirtual

Convert to lowercase.

This virtual function converts the char argument to lowercase if possible. If not possible (for example, '2'), returns the argument.

do_tolower() is a hook for a derived facet to change the behavior of lowercasing. do_tolower() must always return the same result for the same input.

Parameters
__cThe char to convert.
Returns
The lowercase char if convertible, else __c.

◆ do_toupper() [1/2]

virtual const char_type* std::ctype< char >::do_toupper ( char_type __lo,
const char_type __hi 
) const
protectedvirtual

Convert array to uppercase.

This virtual function converts each char in the range [lo,hi) to uppercase if possible. Other chars remain untouched.

do_toupper() is a hook for a derived facet to change the behavior of uppercasing. do_toupper() must always return the same result for the same input.

Parameters
__loPointer to start of range.
__hiPointer to end of range.
Returns
__hi.

◆ do_toupper() [2/2]

virtual char_type std::ctype< char >::do_toupper ( char_type  __c) const
protectedvirtual

Convert to uppercase.

This virtual function converts the char argument to uppercase if possible. If not possible (for example, '2'), returns the argument.

do_toupper() is a hook for a derived facet to change the behavior of uppercasing. do_toupper() must always return the same result for the same input.

Parameters
__cThe char to convert.
Returns
The uppercase char if convertible, else __c.

◆ do_widen() [1/2]

virtual char_type std::ctype< char >::do_widen ( char  __c) const
inlineprotectedvirtual

Widen char.

This virtual function converts the char to char using the simplest reasonable transformation. For an underived ctype<char> facet, the argument will be returned unchanged.

do_widen() is a hook for a derived facet to change the behavior of widening. do_widen() must always return the same result for the same input.

Note: this is not what you want for codepage conversions. See codecvt for that.

Parameters
__cThe char to convert.
Returns
The converted character.

Definition at line 1084 of file locale_facets.h.

◆ do_widen() [2/2]

virtual const char* std::ctype< char >::do_widen ( const char *  __lo,
const char *  __hi,
char_type __to 
) const
inlineprotectedvirtual

Widen char array.

This function converts each char in the range [lo,hi) to char using the simplest reasonable transformation. For an underived ctype<char> facet, the argument will be copied unchanged.

do_widen() is a hook for a derived facet to change the behavior of widening. do_widen() must always return the same result for the same input.

Note: this is not what you want for codepage conversions. See codecvt for that.

Parameters
__loPointer to start of range.
__hiPointer to end of range.
__toPointer to the destination array.
Returns
__hi.

Definition at line 1107 of file locale_facets.h.

◆ is() [1/2]

const char * std::ctype< char >::is ( const char *  __lo,
const char *  __hi,
mask *  __vec 
) const
inline

Return a mask array.

This function finds the mask for each char in the range [lo, hi) and successively writes it to vec. vec must have as many elements as the char array.

Parameters
__loPointer to start of range.
__hiPointer to end of range.
__vecPointer to an array of mask storage.
Returns
__hi.

Definition at line 47 of file ctype_inline.h.

◆ is() [2/2]

bool std::ctype< char >::is ( mask  __m,
char  __c 
) const
inline

Test char classification.

This function compares the mask table[c] to __m.

Parameters
__cThe char to compare the mask of.
__mThe mask to compare against.
Returns
True if __m & table[__c] is true, false otherwise.

Definition at line 42 of file ctype_inline.h.

◆ narrow() [1/2]

char std::ctype< char >::narrow ( char_type  __c,
char  __dfault 
) const
inline

Narrow char.

This function converts the char to char using the simplest reasonable transformation. If the conversion fails, dfault is returned instead. For an underived ctype<char> facet, c will be returned unchanged.

This function works as if it returns ctype<char>::do_narrow(c). do_narrow() must always return the same result for the same input.

Note: this is not what you want for codepage conversions. See codecvt for that.

Parameters
__cThe char to convert.
__dfaultChar to return if conversion fails.
Returns
The converted character.

Definition at line 931 of file locale_facets.h.

References std::ctype< _CharT >::do_narrow().

◆ narrow() [2/2]

const char_type* std::ctype< char >::narrow ( const char_type __lo,
const char_type __hi,
char  __dfault,
char *  __to 
) const
inline

Narrow char array.

This function converts each char in the input to char using the simplest reasonable transformation and writes the results to the destination array. For any char in the input that cannot be converted, dfault is used instead. For an underived ctype<char> facet, the argument will be copied unchanged.

This function works as if it returns ctype<char>::do_narrow(lo, hi, dfault, to). do_narrow() must always return the same result for the same input.

Note: this is not what you want for codepage conversions. See codecvt for that.

Parameters
__loPointer to start of range.
__hiPointer to end of range.
__dfaultChar to use if conversion fails.
__toPointer to the destination array.
Returns
__hi.

Definition at line 964 of file locale_facets.h.

References std::ctype< _CharT >::do_narrow().

◆ scan_is()

const char * std::ctype< char >::scan_is ( mask  __m,
const char *  __lo,
const char *  __hi 
) const
inline

Find char matching a mask.

This function searches for and returns the first char in [lo,hi) for which is(m,char) is true.

Parameters
__mThe mask to compare against.
__loPointer to start of range.
__hiPointer to end of range.
Returns
Pointer to a matching char if found, else __hi.

Definition at line 56 of file ctype_inline.h.

◆ scan_not()

const char * std::ctype< char >::scan_not ( mask  __m,
const char *  __lo,
const char *  __hi 
) const
inline

Find char not matching a mask.

This function searches for and returns a pointer to the first char in [__lo,__hi) for which is(m,char) is false.

Parameters
__mThe mask to compare against.
__loPointer to start of range.
__hiPointer to end of range.
Returns
Pointer to a non-matching char if found, else __hi.

Definition at line 66 of file ctype_inline.h.

◆ table()

const mask* std::ctype< char >::table ( ) const
throw (
)
inline

Returns a pointer to the mask table provided to the constructor, or the default from classic_table() if none was provided.

Definition at line 983 of file locale_facets.h.

◆ tolower() [1/2]

const char_type* std::ctype< char >::tolower ( char_type __lo,
const char_type __hi 
) const
inline

Convert array to lowercase.

This function converts each char in the range [lo,hi) to lowercase if possible. Other chars remain untouched.

tolower() acts as if it returns ctype<char>:: do_tolower(__lo, __hi). do_tolower() must always return the same result for the same input.

Parameters
__loPointer to first char in range.
__hiPointer to end of range.
Returns
__hi.

Definition at line 852 of file locale_facets.h.

References std::ctype< _CharT >::do_tolower().

◆ tolower() [2/2]

char_type std::ctype< char >::tolower ( char_type  __c) const
inline

Convert to lowercase.

This function converts the char argument to lowercase if possible. If not possible (for example, '2'), returns the argument.

tolower() acts as if it returns ctype<char>::do_tolower(__c). do_tolower() must always return the same result for the same input.

Parameters
__cThe char to convert.
Returns
The lowercase char if convertible, else __c.

Definition at line 835 of file locale_facets.h.

References std::ctype< _CharT >::do_tolower().

◆ toupper() [1/2]

const char_type* std::ctype< char >::toupper ( char_type __lo,
const char_type __hi 
) const
inline

Convert array to uppercase.

This function converts each char in the range [__lo,__hi) to uppercase if possible. Other chars remain untouched.

toupper() acts as if it returns ctype<char>:: do_toupper(__lo, __hi). do_toupper() must always return the same result for the same input.

Parameters
__loPointer to first char in range.
__hiPointer to end of range.
Returns
__hi.

Definition at line 819 of file locale_facets.h.

References std::ctype< _CharT >::do_toupper().

◆ toupper() [2/2]

char_type std::ctype< char >::toupper ( char_type  __c) const
inline

Convert to uppercase.

This function converts the char argument to uppercase if possible. If not possible (for example, '2'), returns the argument.

toupper() acts as if it returns ctype<char>::do_toupper(c). do_toupper() must always return the same result for the same input.

Parameters
__cThe char to convert.
Returns
The uppercase char if convertible, else __c.

Definition at line 802 of file locale_facets.h.

References std::ctype< _CharT >::do_toupper().

◆ widen() [1/2]

char_type std::ctype< char >::widen ( char  __c) const
inline

Widen char.

This function converts the char to char_type using the simplest reasonable transformation. For an underived ctype<char> facet, the argument will be returned unchanged.

This function works as if it returns ctype<char>::do_widen(c). do_widen() must always return the same result for the same input.

Note: this is not what you want for codepage conversions. See codecvt for that.

Parameters
__cThe char to convert.
Returns
The converted character.

Definition at line 872 of file locale_facets.h.

References std::ctype< _CharT >::do_widen().

◆ widen() [2/2]

const char* std::ctype< char >::widen ( const char *  __lo,
const char *  __hi,
char_type __to 
) const
inline

Widen char array.

This function converts each char in the input to char using the simplest reasonable transformation. For an underived ctype<char> facet, the argument will be copied unchanged.

This function works as if it returns ctype<char>::do_widen(c). do_widen() must always return the same result for the same input.

Note: this is not what you want for codepage conversions. See codecvt for that.

Parameters
__loPointer to first char in range.
__hiPointer to end of range.
__toPointer to the destination array.
Returns
__hi.

Definition at line 899 of file locale_facets.h.

References std::ctype< _CharT >::do_widen().

Member Data Documentation

◆ id

locale::id std::ctype< char >::id
static

The facet id for ctype<char>

Definition at line 703 of file locale_facets.h.

◆ table_size

const size_t std::ctype< char >::table_size
static

The size of the mask table. It is SCHAR_MAX + 1.

Definition at line 705 of file locale_facets.h.


The documentation for this class was generated from the following files: