libstdc++
std::collate< _CharT > Class Template Reference
Inheritance diagram for std::collate< _CharT >:
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Public Types

typedef _CharT char_type
 
typedef basic_string< _CharT > string_type
 

Public Member Functions

 collate (size_t __refs=0)
 
 collate (__c_locale __cloc, size_t __refs=0)
 
int _M_compare (const _CharT *, const _CharT *) const throw ()
 
template<>
int _M_compare (const char *, const char *) const throw()
 
template<>
int _M_compare (const wchar_t *, const wchar_t *) const throw()
 
size_t _M_transform (_CharT *, const _CharT *, size_t) const throw ()
 
template<>
size_t _M_transform (char *, const char *, size_t) const throw()
 
template<>
size_t _M_transform (wchar_t *, const wchar_t *, size_t) const throw()
 
int compare (const _CharT *__lo1, const _CharT *__hi1, const _CharT *__lo2, const _CharT *__hi2) const
 
long hash (const _CharT *__lo, const _CharT *__hi) const
 
string_type transform (const _CharT *__lo, const _CharT *__hi) const
 

Static Public Attributes

static locale::id id
 

Protected Member Functions

virtual ~collate ()
 
virtual int do_compare (const _CharT *__lo1, const _CharT *__hi1, const _CharT *__lo2, const _CharT *__hi2) const
 
virtual long do_hash (const _CharT *__lo, const _CharT *__hi) const
 
virtual string_type do_transform (const _CharT *__lo, const _CharT *__hi) 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_collate
 

Detailed Description

template<typename _CharT>
class std::collate< _CharT >

Facet for localized string comparison.

This facet encapsulates the code to compare strings in a localized manner.

The collate template uses protected virtual functions to provide the actual results. The public accessors forward the call to the virtual functions. These virtual functions are hooks for developers to implement the behavior they require from the collate facet.

Definition at line 642 of file locale_classes.h.

Member Typedef Documentation

◆ char_type

template<typename _CharT>
typedef _CharT std::collate< _CharT >::char_type

Public typedefs.

Definition at line 648 of file locale_classes.h.

◆ string_type

template<typename _CharT>
typedef basic_string<_CharT> std::collate< _CharT >::string_type

Public typedefs.

Definition at line 649 of file locale_classes.h.

Constructor & Destructor Documentation

◆ collate() [1/2]

template<typename _CharT>
std::collate< _CharT >::collate ( size_t  __refs = 0)
inlineexplicit

Constructor performs initialization.

This is the constructor provided by the standard.

Parameters
__refsPassed to the base facet class.

Definition at line 669 of file locale_classes.h.

◆ collate() [2/2]

template<typename _CharT>
std::collate< _CharT >::collate ( __c_locale  __cloc,
size_t  __refs = 0 
)
inlineexplicit

Internal constructor. Not for general use.

This is a constructor for use by the library itself to set up new locales.

Parameters
__clocThe C locale.
__refsPassed to the base facet class.

Definition at line 683 of file locale_classes.h.

◆ ~collate()

template<typename _CharT>
virtual std::collate< _CharT >::~collate ( )
inlineprotectedvirtual

Destructor.

Definition at line 746 of file locale_classes.h.

Member Function Documentation

◆ compare()

template<typename _CharT>
int std::collate< _CharT >::compare ( const _CharT *  __lo1,
const _CharT *  __hi1,
const _CharT *  __lo2,
const _CharT *  __hi2 
) const
inline

Compare two strings.

This function compares two strings and returns the result by calling collate::do_compare().

Parameters
__lo1Start of string 1.
__hi1End of string 1.
__lo2Start of string 2.
__hi2End of string 2.
Returns
1 if string1 > string2, -1 if string1 < string2, else 0.

Definition at line 700 of file locale_classes.h.

◆ do_compare()

template<typename _CharT>
int std::collate< _CharT >::do_compare ( const _CharT *  __lo1,
const _CharT *  __hi1,
const _CharT *  __lo2,
const _CharT *  __hi2 
) const
protectedvirtual

Compare two strings.

This function is a hook for derived classes to change the value returned.

See also
compare().
Parameters
__lo1Start of string 1.
__hi1End of string 1.
__lo2Start of string 2.
__hi2End of string 2.
Returns
1 if string1 > string2, -1 if string1 < string2, else 0.

Definition at line 161 of file locale_classes.tcc.

References std::basic_string< _CharT, _Traits, _Alloc >::c_str(), std::basic_string< _CharT, _Traits, _Alloc >::data(), and std::basic_string< _CharT, _Traits, _Alloc >::length().

◆ do_hash()

template<typename _CharT>
long std::collate< _CharT >::do_hash ( const _CharT *  __lo,
const _CharT *  __hi 
) const
protectedvirtual

Return hash of a string.

This function computes and returns a hash on the input string. This function is a hook for derived classes to change the value returned.

Parameters
__loStart of string.
__hiEnd of string.
Returns
Hash value.

Definition at line 256 of file locale_classes.tcc.

◆ do_transform()

template<typename _CharT>
collate< _CharT >::string_type std::collate< _CharT >::do_transform ( const _CharT *  __lo,
const _CharT *  __hi 
) const
protectedvirtual

Transform string to comparable form.

This function is a hook for derived classes to change the value returned.

Parameters
__loStart.
__hiEnd.
Returns
transformed string.

Definition at line 200 of file locale_classes.tcc.

References std::basic_string< _CharT, _Traits, _Alloc >::c_str(), std::basic_string< _CharT, _Traits, _Alloc >::data(), and std::basic_string< _CharT, _Traits, _Alloc >::length().

◆ hash()

template<typename _CharT>
long std::collate< _CharT >::hash ( const _CharT *  __lo,
const _CharT *  __hi 
) const
inline

Return hash of a string.

This function computes and returns a hash on the input string. It does so by returning collate::do_hash().

Parameters
__loStart of string.
__hiEnd of string.
Returns
Hash value.

Definition at line 733 of file locale_classes.h.

◆ transform()

template<typename _CharT>
string_type std::collate< _CharT >::transform ( const _CharT *  __lo,
const _CharT *  __hi 
) const
inline

Transform string to comparable form.

This function is a wrapper for strxfrm functionality. It takes the input string and returns a modified string that can be directly compared to other transformed strings. In the C locale, this function just returns a copy of the input string. In some other locales, it may replace two chars with one, change a char for another, etc. It does so by returning collate::do_transform().

Parameters
__loStart of string.
__hiEnd of string.
Returns
Transformed string_type.

Definition at line 719 of file locale_classes.h.

Member Data Documentation

◆ id

template<typename _CharT>
locale::id std::collate< _CharT >::id
static

Numpunct facet id.

Definition at line 659 of file locale_classes.h.


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