Provided by: libstdc++-10-doc_10.4.0-5ubuntu2_all 
NAME
std::collate< _CharT > - Facet for localized string comparison.
SYNOPSIS
Inherits std::locale::facet.
Inherited by std::collate_byname< _CharT >.
Public Types
typedef _CharT char_type
Public typedefs.
typedef basic_string< _CharT > string_type
Public typedefs.
Public Member Functions
collate (__c_locale __cloc, size_t __refs=0)
Internal constructor. Not for general use.
collate (size_t __refs=0)
Constructor performs initialization.
int _M_compare (const _CharT *, const _CharT *) const throw ()
int _M_compare (const char *, const char *) const throw()
int _M_compare (const wchar_t *, const wchar_t *) const throw()
size_t _M_transform (_CharT *, const _CharT *, size_t) const throw ()
size_t _M_transform (char *, const char *, size_t) const throw()
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
Compare two strings.
long hash (const _CharT *__lo, const _CharT *__hi) const
Return hash of a string.
string_type transform (const _CharT *__lo, const _CharT *__hi) const
Transform string to comparable form.
Static Public Attributes
static locale::id id
Numpunct facet id.
Protected Member Functions
virtual ~collate ()
Destructor.
virtual int do_compare (const _CharT *__lo1, const _CharT *__hi1, const _CharT *__lo2,
const _CharT *__hi2) const
Compare two strings.
virtual long do_hash (const _CharT *__lo, const _CharT *__hi) const
Return hash of a string.
virtual string_type do_transform (const _CharT *__lo, const _CharT *__hi) const
Transform string to comparable form.
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 644 of file locale_classes.h.
Member Typedef Documentation
template<typename _CharT > typedef _CharT std::collate< _CharT >::char_type
Public typedefs.
Definition at line 650 of file locale_classes.h.
template<typename _CharT > typedef basic_string<_CharT> std::collate< _CharT >::string_type
Public typedefs.
Definition at line 651 of file locale_classes.h.
Constructor & Destructor Documentation
template<typename _CharT > std::collate< _CharT >::collate (size_t __refs = 0) [inline],
[explicit]
Constructor performs initialization. This is the constructor provided by the standard.
Parameters
__refs Passed to the base facet class.
Definition at line 671 of file locale_classes.h.
template<typename _CharT > std::collate< _CharT >::collate (__c_locale __cloc, size_t __refs =
0) [inline], [explicit]
Internal constructor. Not for general use. This is a constructor for use by the library
itself to set up new locales.
Parameters
__cloc The C locale.
__refs Passed to the base facet class.
Definition at line 685 of file locale_classes.h.
template<typename _CharT > virtual std::collate< _CharT >::~collate () [inline], [protected],
[virtual]
Destructor.
Definition at line 748 of file locale_classes.h.
Member Function Documentation
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
__lo1 Start of string 1.
__hi1 End of string 1.
__lo2 Start of string 2.
__hi2 End of string 2.
Returns
1 if string1 > string2, -1 if string1 < string2, else 0.
Definition at line 702 of file locale_classes.h.
template<typename _CharT > int std::collate< _CharT >::do_compare (const _CharT * __lo1, const
_CharT * __hi1, const _CharT * __lo2, const _CharT * __hi2) const [protected], [virtual]
Compare two strings. This function is a hook for derived classes to change the value
returned.
See also
compare().
Parameters
__lo1 Start of string 1.
__hi1 End of string 1.
__lo2 Start of string 2.
__hi2 End of string 2.
Returns
1 if string1 > string2, -1 if string1 < string2, else 0.
Definition at line 160 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().
template<typename _CharT > long std::collate< _CharT >::do_hash (const _CharT * __lo, const
_CharT * __hi) const [protected], [virtual]
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
__lo Start of string.
__hi End of string.
Returns
Hash value.
Definition at line 255 of file locale_classes.tcc.
template<typename _CharT > collate< _CharT >::string_type std::collate< _CharT >::do_transform
(const _CharT * __lo, const _CharT * __hi) const [protected], [virtual]
Transform string to comparable form. This function is a hook for derived classes to change
the value returned.
Parameters
__lo Start.
__hi End.
Returns
transformed string.
Definition at line 199 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().
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
__lo Start of string.
__hi End of string.
Returns
Hash value.
Definition at line 735 of file locale_classes.h.
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
__lo Start of string.
__hi End of string.
Returns
Transformed string_type.
Definition at line 721 of file locale_classes.h.
Member Data Documentation
template<typename _CharT > locale::id std::collate< _CharT >::id [static]
Numpunct facet id.
Definition at line 661 of file locale_classes.h.
Author
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