collate Class Template Reference

Inheritance diagram for collate:

List of all members.

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Detailed Description

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

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 2466 of file locale_facets.h.

Public Types

• typedef _CharT char_type
• typedef basic_string< _CharT > string_type

Public Member Functions

• template<> int _M_compare (const wchar_t *, const wchar_t *) const
• template<> int _M_compare (const char *, const char *) const
• int _M_compare (const _CharT *, const _CharT *) const
• template<> size_t _M_transform (wchar_t *, const wchar_t *, size_t) const
• template<> size_t _M_transform (char *, const char *, size_t) const
• size_t _M_transform (_CharT *, const _CharT *, size_t) const
• collate (__c_locale __cloc, size_t __refs=0)
• collate (size_t __refs=0)
• 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 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
• virtual ~collate ()

Static Protected Member Functions

• static __c_locale _S_clone_c_locale (__c_locale &__cloc)
• 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 ()

Protected Attributes

• __c_locale _M_c_locale_collate

Friends

• class locale::_Impl

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Member Typedef Documentation

typedef _CharT char_type

Public typedefs.

Reimplemented in collate_byname.

Definition at line 2472 of file locale_facets.h.

typedef basic_string<_CharT> string_type

Public typedefs.

Reimplemented in collate_byname.

Definition at line 2473 of file locale_facets.h.

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Constructor & Destructor Documentation

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 2493 of file locale_facets.h.

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 2507 of file locale_facets.h.

virtual ~collate

(

)

[inline, protected, virtual]

Destructor.

Definition at line 2570 of file locale_facets.h.

References collate::_M_c_locale_collate.

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Member Function Documentation

int 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 2524 of file locale_facets.h.

References collate::do_compare().

int 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 2304 of file locale_facets.tcc.

References collate::_M_compare().

Referenced by collate::compare().

long 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 2387 of file locale_facets.tcc.

References __gnu_cxx::__val.

Referenced by collate::hash().

collate< _CharT >::string_type 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:

	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 2343 of file locale_facets.tcc.

References collate::_M_transform(), basic_string::append(), basic_string::c_str(), basic_string::data(), basic_string::length(), and basic_string::push_back().

Referenced by collate::transform().

long 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 2557 of file locale_facets.h.

References collate::do_hash().

string_type 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 2543 of file locale_facets.h.

References collate::do_transform().

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Member Data Documentation

locale::id id [static]

Numpunct facet id.

Definition at line 2483 of file locale_facets.h.

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

• locale_facets.h
• locale_facets.tcc

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