std::numpunct man page

std::numpunct< _CharT > — Primary class template numpunct.

This facet stores several pieces of information related to printing and scanning numbers, such as the decimal point character. It takes a template parameter specifying the char type. The numpunct facet is used by streams for many I/O operations involving numbers.

Synopsis

Inherits std::locale::facet.

Inherited by std::numpunct_byname< _CharT >.

Public Types

typedef __numpunct_cache< _CharT > __cache_type
typedef _CharT char_type
Public typedefs.
typedef basic_string< _CharT > string_type
Public typedefs.

Public Member Functions

numpunct (size_t __refs=0)
Numpunct constructor.
numpunct (__cache_type *__cache, size_t __refs=0)
Internal constructor. Not for general use.
numpunct (__c_locale __cloc, size_t __refs=0)
Internal constructor. Not for general use.
char_type decimal_point () const
Return decimal point character.
string_type falsename () const
Return string representation of bool false.
string grouping () const
Return grouping specification.
char_type thousands_sep () const
Return thousands separator character.
string_type truename () const
Return string representation of bool true.

Static Public Attributes

static locale::id id
Numpunct facet id.

Protected Member Functions

virtual ~numpunct ()
Destructor.
void _M_initialize_numpunct (__c_locale __cloc=0)

template<> void _M_initialize_numpunct (__c_locale __cloc)

template<> void _M_initialize_numpunct (__c_locale __cloc)

virtual char_type do_decimal_point () const
Return decimal point character.
virtual string_type do_falsename () const
Return string representation of bool false.
virtual string do_grouping () const
Return grouping specification.
virtual char_type do_thousands_sep () const
Return thousands separator character.
virtual string_type do_truename () const
Return string representation of bool true.

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

__cache_type * _M_data

Detailed Description

template<typename _CharT>

class std::numpunct< _CharT >" Primary class template numpunct.

This facet stores several pieces of information related to printing and scanning numbers, such as the decimal point character. It takes a template parameter specifying the char type. The numpunct facet is used by streams for many I/O operations involving numbers.

The numpunct 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 a numpunct facet.

Definition at line 1666 of file locale_facets.h.

Member Typedef Documentation

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

Public typedefs.

Definition at line 1672 of file locale_facets.h.

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

Public typedefs.

Definition at line 1673 of file locale_facets.h.

Constructor & Destructor Documentation

template<typename _CharT > std::numpunct< _CharT >::numpunct (size_t __refs = 0) [inline], [explicit]

Numpunct constructor.

Parameters:

__refs Refcount to pass to the base class.

Definition at line 1690 of file locale_facets.h.

template<typename _CharT > std::numpunct< _CharT >::numpunct (__cache_type * __cache, 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 the predefined locale facets.

Parameters:

__cache __numpunct_cache object.
__refs Refcount to pass to the base class.

Definition at line 1704 of file locale_facets.h.

template<typename _CharT > std::numpunct< _CharT >::numpunct (__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 Refcount to pass to the base class.

Definition at line 1718 of file locale_facets.h.

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

Destructor.

Referenced by std::numpunct< _CharT >::do_falsename().

Member Function Documentation

template<typename _CharT > char_type std::numpunct< _CharT >::decimal_point () const [inline]

Return decimal point character. This function returns a char_type to use as a decimal point. It does so by returning returning numpunct<char_type>::do_decimal_point().

Returns:

char_type representing a decimal point.

Definition at line 1732 of file locale_facets.h.

template<typename _CharT > virtual char_type std::numpunct< _CharT >::do_decimal_point () const [inline], [protected], [virtual]

Return decimal point character. Returns a char_type to use as a decimal point. This function is a hook for derived classes to change the value returned.

Returns:

char_type representing a decimal point.

Definition at line 1819 of file locale_facets.h.

template<typename _CharT > virtual string_type std::numpunct< _CharT >::do_falsename () const [inline], [protected], [virtual]

Return string representation of bool false. Returns a string_type containing the text representation for false bool variables. This function is a hook for derived classes to change the value returned.

Returns:

string_type representing printed form of false.

Definition at line 1870 of file locale_facets.h.

References std::numpunct< _CharT >::~numpunct().

template<typename _CharT > virtual string std::numpunct< _CharT >::do_grouping () const [inline], [protected], [virtual]

Return grouping specification. Returns a string representing groupings for the integer part of a number. This function is a hook for derived classes to change the value returned.

See also:

grouping() for details.

Returns:

String representing grouping specification.

Definition at line 1844 of file locale_facets.h.

template<typename _CharT > virtual char_type std::numpunct< _CharT >::do_thousands_sep () const [inline], [protected], [virtual]

Return thousands separator character. Returns a char_type to use as a thousands separator. This function is a hook for derived classes to change the value returned.

Returns:

char_type representing a thousands separator.

Definition at line 1831 of file locale_facets.h.

template<typename _CharT > virtual string_type std::numpunct< _CharT >::do_truename () const [inline], [protected], [virtual]

Return string representation of bool true. Returns a string_type containing the text representation for true bool variables. This function is a hook for derived classes to change the value returned.

Returns:

string_type representing printed form of true.

Definition at line 1857 of file locale_facets.h.

template<typename _CharT > string_type std::numpunct< _CharT >::falsename () const [inline]

Return string representation of bool false. This function returns a string_type containing the text representation for false bool variables. It does so by calling numpunct<char_type>::do_falsename().

Returns:

string_type representing printed form of false.

Definition at line 1802 of file locale_facets.h.

template<typename _CharT > string std::numpunct< _CharT >::grouping () const [inline]

Return grouping specification. This function returns a string representing groupings for the integer part of a number. Groupings indicate where thousands separators should be inserted in the integer part of a number.

Each char in the return string is interpret as an integer rather than a character. These numbers represent the number of digits in a group. The first char in the string represents the number of digits in the least significant group. If a char is negative, it indicates an unlimited number of digits for the group. If more chars from the string are required to group a number, the last char is used repeatedly.

For example, if the grouping() returns '\003\002' and is applied to the number 123456789, this corresponds to 12,34,56,789. Note that if the string was '32', this would put more than 50 digits into the least significant group if the character set is ASCII.

The string is returned by calling numpunct<char_type>::do_grouping().

Returns:

string representing grouping specification.

Definition at line 1776 of file locale_facets.h.

template<typename _CharT > char_type std::numpunct< _CharT >::thousands_sep () const [inline]

Return thousands separator character. This function returns a char_type to use as a thousands separator. It does so by returning returning numpunct<char_type>::do_thousands_sep().

Returns:

char_type representing a thousands separator.

Definition at line 1745 of file locale_facets.h.

template<typename _CharT > string_type std::numpunct< _CharT >::truename () const [inline]

Return string representation of bool true. This function returns a string_type containing the text representation for true bool variables. It does so by calling numpunct<char_type>::do_truename().

Returns:

string_type representing printed form of true.

Definition at line 1789 of file locale_facets.h.

Member Data Documentation

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

Numpunct facet id.

Definition at line 1682 of file locale_facets.h.

Author

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Fri Sep 16 2016 libstdc++