std::ctype - Man Page

typedef const int * __to_type
typedef _CharT char_type
typedef __ctype_abstract_base< _CharT >::mask mask

ctype (size_t __refs=0)
const char_type * is (const char_type *__lo, const char_type *__hi, mask *__vec) const
Return a mask array.
bool is (mask __m, char_type __c) const
Test char_type classification.
char narrow (char_type __c, char __dfault) const
Narrow char_type to char.
const char_type * narrow (const char_type *__lo, const char_type *__hi, char __dfault, char *__to) const
Narrow array to char array.
const char_type * scan_is (mask __m, const char_type *__lo, const char_type *__hi) const
Find char_type matching a mask.
const char_type * scan_not (mask __m, const char_type *__lo, const char_type *__hi) const
Find char_type not matching a mask.
const char_type * tolower (char_type *__lo, const char_type *__hi) const
Convert array to lowercase.
char_type tolower (char_type __c) const
Convert to lowercase.
const char_type * toupper (char_type *__lo, const char_type *__hi) const
Convert array to uppercase.
char_type toupper (char_type __c) const
Convert to uppercase.
char_type widen (char __c) const
Widen char to char_type.
const char * widen (const char *__lo, const char *__hi, char_type *__to) const
Widen array to char_type.

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
The facet id for ctype<char_type>
static const mask lower
static const mask print
static const mask punct
static const mask space
static const mask upper
static const mask xdigit

virtual const char_type * do_is (const char_type *__lo, const char_type *__hi, mask *__vec) const
Return a mask array.
virtual bool do_is (mask __m, char_type __c) const
Test char_type classification.
virtual char do_narrow (char_type, char __dfault) const
Narrow char_type to char.
virtual const char_type * do_narrow (const char_type *__lo, const char_type *__hi, char __dfault, char *__to) const
Narrow char_type array to char.
virtual const char_type * do_scan_is (mask __m, const char_type *__lo, const char_type *__hi) const
Find char_type matching mask.
virtual const char_type * do_scan_not (mask __m, const char_type *__lo, const char_type *__hi) const
Find char_type not matching mask.
virtual const char_type * do_tolower (char_type *__lo, const char_type *__hi) const
Convert array to lowercase.
virtual char_type do_tolower (char_type __c) const
Convert to lowercase.
virtual const char_type * do_toupper (char_type *__lo, const char_type *__hi) const
Convert array to uppercase.
virtual char_type do_toupper (char_type __c) const
Convert to uppercase.
virtual char_type do_widen (char __c) const
Widen char.
virtual const char * do_widen (const char *__lo, const char *__hi, char_type *__dest) const
Widen char array.

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)

class std::ctype< _CharT >"Primary class template ctype facet.

This template class defines classification and conversion functions for character sets. It wraps cctype functionality. Ctype gets used by streams for many I/O operations.

This template provides the protected virtual functions the developer will have to replace in a derived class or specialization to make a working facet. The public functions that access them are defined in __ctype_abstract_base, to allow for implementation flexibility. See ctype<wchar_t> for an example. The functions are documented in __ctype_abstract_base.

Note: implementations are provided for all the protected virtual functions, but will likely not be useful.

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

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

Parameters

Returns

Implements std::__ctype_abstract_base< _CharT >.

Test char_type classification. This function finds a mask M for c and compares it to mask m.

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

Parameters

Returns

(M & __m) != 0.

Implements std::__ctype_abstract_base< _CharT >.

Narrow char_type to char. This virtual function converts the argument to char using the simplest reasonable transformation. If the conversion fails, dfault is returned instead.

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

Returns

The converted char.

Implements std::__ctype_abstract_base< _CharT >.

Referenced by std::ctype< char >::narrow(), and std::ctype< char >::narrow().

Narrow char_type array to char. This virtual function converts each char_type in the range [__lo,__hi) to char using the simplest reasonable transformation and writes the results to the destination array. For any element in the input that cannot be converted, __dfault is used instead.

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

Returns

Implements std::__ctype_abstract_base< _CharT >.

Find char_type matching mask. This function searches for and returns the first char_type c in [__lo,__hi) for which is(__m,c) is true.

do_scan_is() is a hook for a derived facet to change the behavior of match searching. do_is() must always return the same result for the same input.

Parameters

Returns

Pointer to a matching char_type if found, else __hi.

Implements std::__ctype_abstract_base< _CharT >.

Find char_type not matching mask. This function searches for and returns a pointer to the first char_type c of [lo,hi) for which is(m,c) is false.

do_scan_is() is a hook for a derived facet to change the behavior of match searching. do_is() must always return the same result for the same input.

Parameters

Returns

Pointer to a non-matching char_type if found, else __hi.

Implements std::__ctype_abstract_base< _CharT >.

Convert array to lowercase. This virtual function converts each char_type in the range [__lo,__hi) to lowercase if possible. Other elements 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

Returns

Implements std::__ctype_abstract_base< _CharT >.

Convert to lowercase. This virtual function converts the 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

Returns

The lowercase char_type if convertible, else __c.

Implements std::__ctype_abstract_base< _CharT >.

Referenced by std::ctype< char >::tolower(), and std::ctype< char >::tolower().

Convert array to uppercase. This virtual function converts each char_type in the range [__lo,__hi) to uppercase if possible. Other elements 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

Returns

Implements std::__ctype_abstract_base< _CharT >.

Convert to uppercase. This virtual function converts the char_type 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

Returns

The uppercase char_type if convertible, else __c.

Implements std::__ctype_abstract_base< _CharT >.

Referenced by std::ctype< char >::toupper(), and std::ctype< char >::toupper().

Widen char. This virtual function converts the char to char_type using the simplest reasonable transformation.

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

Returns

The converted char_type

Implements std::__ctype_abstract_base< _CharT >.

Referenced by std::ctype< char >::widen(), and std::ctype< char >::widen().

Widen char array. This function converts each char in the input to char_type using the simplest reasonable transformation.

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

Returns

Implements std::__ctype_abstract_base< _CharT >.

Return a mask array. This function finds the mask for each char_type in the range [lo,hi) and successively writes it to vec. vec must have as many elements as the char array. It does so by returning the value of ctype<char_type>::do_is().

Parameters

Returns

References std::__ctype_abstract_base< _CharT >::do_is().

Test char_type classification. This function finds a mask M for __c and compares it to mask __m. It does so by returning the value of ctype<char_type>::do_is().

Parameters

Returns

(M & __m) != 0.

References std::__ctype_abstract_base< _CharT >::do_is().

Referenced by std::time_get< _CharT, _InIter >::get().

Narrow char_type to char. This function converts the char_type to char using the simplest reasonable transformation. If the conversion fails, dfault is returned instead. It does so by returning ctype<char_type>::do_narrow(__c).

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

Parameters

Returns

The converted char.

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

Referenced by std::time_get< _CharT, _InIter >::do_get_year(), std::time_get< _CharT, _InIter >::get(), and std::time_put< _CharT, _OutIter >::put().

Narrow array to char array. This function converts each char_type in the input to char using the simplest reasonable transformation and writes the results to the destination array. For any char_type in the input that cannot be converted, dfault is used instead. It does so by returning ctype<char_type>::do_narrow(__lo, __hi, __dfault, __to).

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

Parameters

Returns

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

Find char_type matching a mask. This function searches for and returns the first char_type c in [lo,hi) for which is(m,c) is true. It does so by returning ctype<char_type>::do_scan_is().

Parameters

Returns

Pointer to matching char_type if found, else __hi.

References std::__ctype_abstract_base< _CharT >::do_scan_is().

Find char_type not matching a mask. This function searches for and returns the first char_type c in [lo,hi) for which is(m,c) is false. It does so by returning ctype<char_type>::do_scan_not().

Parameters

Returns

Pointer to non-matching char if found, else __hi.

References std::__ctype_abstract_base< _CharT >::do_scan_not().

Convert array to lowercase. This function converts each char_type in the range [__lo,__hi) to lowercase if possible. Other elements remain untouched. It does so by returning ctype<char_type>:: do_tolower(__lo, __hi).

Parameters

Returns

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

Convert to lowercase. This function converts the argument to lowercase if possible. If not possible (for example, '2'), returns the argument. It does so by returning ctype<char_type>::do_tolower(c).

Parameters

Returns

The lowercase char_type if convertible, else __c.

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

Referenced by std::time_get< _CharT, _InIter >::get().

Convert array to uppercase. This function converts each char_type in the range [lo,hi) to uppercase if possible. Other elements remain untouched. It does so by returning ctype<char_type>:: do_toupper(lo, hi).

Parameters

Returns

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

Convert to uppercase. This function converts the argument to uppercase if possible. If not possible (for example, '2'), returns the argument. It does so by returning ctype<char_type>::do_toupper().

Parameters

Returns

The uppercase char_type if convertible, else __c.

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

Referenced by std::time_get< _CharT, _InIter >::get().

Widen char to char_type. This function converts the char argument to char_type using the simplest reasonable transformation. It does so by returning ctype<char_type>::do_widen(c).

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

Parameters

Returns

The converted char_type.

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

Referenced by std::money_get< _CharT, _InIter >::do_get(), std::time_get< _CharT, _InIter >::do_get(), and std::time_put< _CharT, _OutIter >::do_put().

Widen array to char_type. This function converts each char in the input to char_type using the simplest reasonable transformation. It does so by returning ctype<char_type>::do_widen(c).

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

Parameters

Returns

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

The facet id for ctype<char_type>