Provided by: libstdc++-5-doc_5.4.0-6ubuntu1~16.04.12_all 
NAME
std::regex_traits< _Ch_type > -
SYNOPSIS
Public Types
typedef _RegexMask char_class_type
typedef _Ch_type char_type
typedef std::locale locale_type
typedef std::basic_string< char_type > string_type
Public Member Functions
regex_traits ()
locale_type getloc () const
locale_type imbue (locale_type __loc)
bool isctype (_Ch_type __c, char_class_type __f) const
template<typename _Fwd_iter > char_class_type lookup_classname (_Fwd_iter __first,
_Fwd_iter __last, bool __icase=false) const
template<typename _Fwd_iter > string_type lookup_collatename (_Fwd_iter __first, _Fwd_iter
__last) const
template<typename _Fwd_iter > string_type transform (_Fwd_iter __first, _Fwd_iter __last)
const
template<typename _Fwd_iter > string_type transform_primary (_Fwd_iter __first, _Fwd_iter
__last) const
char_type translate (char_type __c) const
char_type translate_nocase (char_type __c) const
int value (_Ch_type __ch, int __radix) const
Static Public Member Functions
static std::size_t length (const char_type *__p)
Protected Attributes
locale_type _M_locale
Detailed Description
template<typename _Ch_type>
struct std::regex_traits< _Ch_type >" Describes aspects of a regular expression.
A regular expression traits class that satisfies the requirements of section [28.7].
The class regex is parameterized around a set of related types and functions used to
complete the definition of its semantics. This class satisfies the requirements of such a
traits class.
Definition at line 87 of file regex.h.
Constructor & Destructor Documentation
template<typename _Ch_type> std::regex_traits< _Ch_type >::regex_traits () [inline]
Constructs a default traits object.
Definition at line 164 of file regex.h.
Member Function Documentation
template<typename _Ch_type> locale_type std::regex_traits< _Ch_type >::getloc () const
[inline]
Gets a copy of the current locale in use by the regex_traits object.
Definition at line 377 of file regex.h.
References std::regex_constants::awk, std::regex_constants::basic,
std::regex_constants::collate, std::regex_constants::ECMAScript,
std::regex_constants::egrep, std::regex_constants::extended, std::regex_constants::grep,
std::regex_constants::icase, std::regex_constants::nosubs, and
std::regex_constants::optimize.
Referenced by std::regex_traits< _Ch_type >::value().
template<typename _Ch_type> locale_type std::regex_traits< _Ch_type >::imbue (locale_type
__loc) [inline]
Imbues the regex_traits object with a copy of a new locale.
Parameters:
__loc A locale.
Returns:
a copy of the previous locale in use by the regex_traits object.
Note:
Calling imbue with a different locale than the one currently in use invalidates all
cached data held by *this.
Definition at line 366 of file regex.h.
template<typename _Ch_type> bool std::regex_traits< _Ch_type >::isctype (_Ch_type __c,
char_class_type __f) const
Determines if c is a member of an identified class.
Parameters:
__c a character.
__f a class type (as returned from lookup_classname).
Returns:
true if the character __c is a member of the classification represented by __f, false
otherwise.
Exceptions:
std::bad_cast if the current locale does not have a ctype facet.
Definition at line 344 of file regex.tcc.
References std::regex_traits< _Ch_type >::value().
Referenced by std::regex_traits< _Ch_type >::lookup_classname().
template<typename _Ch_type> static std::size_t std::regex_traits< _Ch_type >::length (const
char_type * __p) [inline], [static]
Gives the length of a C-style string starting at __p.
Parameters:
__p a pointer to the start of a character sequence.
Returns:
the number of characters between *__p and the first default-initialized value of type
char_type. In other words, uses the C-string algorithm for determining the length of a
sequence of characters.
Definition at line 177 of file regex.h.
template<typename _Ch_type > template<typename _Fwd_iter > regex_traits< _Ch_type
>::char_class_type std::regex_traits< _Ch_type >::lookup_classname (_Fwd_iter __first,
_Fwd_iter __last, bool __icase = false) const
Maps one or more characters to a named character classification.
Parameters:
__first beginning of the character sequence.
__last one-past-the-end of the character sequence.
__icase ignores the case of the classification name.
Returns:
an unspecified value that represents the character classification named by the
character sequence designated by the iterator range [__first, __last). If icase is
true, the returned mask identifies the classification regardless of the case of the
characters to be matched (for example, [[:lower:]] is the same as [[:alpha:]]),
otherwise a case-dependent classification is returned. The value returned shall be
independent of the case of the characters in the character sequence. If the name is
not recognized then returns a value that compares equal to 0.
At least the following names (or their wide-character equivalent) are supported.
• d
• w
• s
• alnum
• alpha
• blank
• cntrl
• digit
• graph
• lower
• print
• punct
• space
• upper
• xdigit
Definition at line 300 of file regex.tcc.
References std::regex_traits< _Ch_type >::isctype().
Referenced by std::regex_traits< _Ch_type >::lookup_collatename().
template<typename _Ch_type > template<typename _Fwd_iter > regex_traits< _Ch_type
>::string_type std::regex_traits< _Ch_type >::lookup_collatename (_Fwd_iter __first,
_Fwd_iter __last) const
Gets a collation element by name.
Parameters:
__first beginning of the collation element name.
__last one-past-the-end of the collation element name.
Returns:
a sequence of one or more characters that represents the collating element consisting
of the character sequence designated by the iterator range [__first, __last). Returns
an empty string if the character sequence is not a valid collating element.
Definition at line 144 of file regex.tcc.
References std::regex_traits< _Ch_type >::lookup_classname().
template<typename _Ch_type> template<typename _Fwd_iter > string_type std::regex_traits<
_Ch_type >::transform (_Fwd_iter __first, _Fwd_iter __last) const [inline]
Gets a sort key for a character sequence.
Parameters:
__first beginning of the character sequence.
__last one-past-the-end of the character sequence.
Returns a sort key for the character sequence designated by the iterator range [F1, F2)
such that if the character sequence [G1, G2) sorts before the character sequence [H1, H2)
then v.transform(G1, G2) < v.transform(H1, H2).
What this really does is provide a more efficient way to compare a string to multiple
other strings in locales with fancy collation rules and equivalence classes.
Returns:
a locale-specific sort key equivalent to the input range.
Exceptions:
std::bad_cast if the current locale does not have a collate facet.
Definition at line 230 of file regex.h.
References std::basic_string< _CharT, _Traits, _Alloc >::data(), and std::basic_string<
_CharT, _Traits, _Alloc >::size().
template<typename _Ch_type> template<typename _Fwd_iter > string_type std::regex_traits<
_Ch_type >::transform_primary (_Fwd_iter __first, _Fwd_iter __last) const [inline]
Gets a sort key for a character sequence, independent of case.
Parameters:
__first beginning of the character sequence.
__last one-past-the-end of the character sequence.
Effects: if typeid(use_facet<collate<_Ch_type> >) == typeid(collate_byname<_Ch_type>) and
the form of the sort key returned by collate_byname<_Ch_type>::transform(__first, __last)
is known and can be converted into a primary sort key then returns that key, otherwise
returns an empty string.
Todo
Implement this function correctly.
Definition at line 254 of file regex.h.
References std::vector< _Tp, _Alloc >::data(), and std::vector< _Tp, _Alloc >::size().
template<typename _Ch_type> char_type std::regex_traits< _Ch_type >::translate (char_type __c)
const [inline]
Performs the identity translation.
Parameters:
__c A character to the locale-specific character set.
Returns:
__c.
Definition at line 188 of file regex.h.
template<typename _Ch_type> char_type std::regex_traits< _Ch_type >::translate_nocase
(char_type __c) const [inline]
Translates a character into a case-insensitive equivalent.
Parameters:
__c A character to the locale-specific character set.
Returns:
the locale-specific lower-case equivalent of __c.
Exceptions:
std::bad_cast if the imbued locale does not support the ctype facet.
Definition at line 201 of file regex.h.
template<typename _Ch_type> int std::regex_traits< _Ch_type >::value (_Ch_type __ch, int
__radix) const
Converts a digit to an int.
Parameters:
__ch a character representing a digit.
__radix the radix if the numeric conversion (limited to 8, 10, or 16).
Returns:
the value represented by the digit __ch in base radix if the character __ch is a valid
digit in base radix; otherwise returns -1.
Definition at line 358 of file regex.tcc.
References std::basic_ios< _CharT, _Traits >::fail(), std::match_results< _Bi_iter, _Alloc
>::format(), std::regex_constants::format_sed, std::regex_traits< _Ch_type >::getloc(),
std::hex(), std::oct(), and std::regex_traits< _Ch_type >::value().
Referenced by std::regex_traits< _Ch_type >::isctype(), and std::regex_traits< _Ch_type
>::value().
Author
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