std::collate< _CharT >(3)

NAME
std::collate< _CharT > - Facet for localized string comparison.

SYNOPSIS

#include <locale>

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.

Member Typedef Documentation

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

Public typedefs.

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

Public typedefs.

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.

  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.

  template<typename _CharT > virtual std::collate< _CharT >::~collate () [inline], [protected], [virtual]

Destructor.

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.

  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.

References std::forward().

  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.

References std::forward().

  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.

References std::forward().

  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.

  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.

Member Data Documentation

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

Numpunct facet id.

Author

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