Section 3: library functions
std::rel_ops – Synopsis Functions template<class _Tp > bool operator!= (const _Tp &__x, const _Tp &__y) template<class _Tp > bool operator<= (const _Tp &__x, const _Tp &__y) template<class _Tp > bool operator> (const _Tp &__x, const _Tp &__y) template<class _Tp > bool operator>= (const _Tp &__x, const _Tp &__y) Detailed Description The generated relational operators are…
std::regex_traits<CharT>::value – std::regex_traits<CharT>::value Synopsis int value(CharT ch, int radix) const; (since C++ 11) Determines the value represented by the digit ch in the numeric base radix, given the currently imbued locale. This function is called by std::regex when processing Quantifiers such as {1} or {2,5}, Backreferences such as \1, and hexadecimal and Unicode character escapes….
std::regex_traits<CharT>::translate_nocase – std::regex_traits<CharT>::translate_nocase Synopsis CharT translate_nocase(CharT c) const; Obtains the comparison key for the character c, such that all characters that are equivalent to this character in the imbued locale, ignoring the case differences, if any, produce the same key. When the regex library needs to match two characters c1 and c2 and the flag…
std::regex_traits<CharT>::translate – std::regex_traits<CharT>::translate Synopsis CharT translate(CharT c) const; Obtains the comparison key for the character c, such that all characters that are equivalent to this character in the imbued locale produce the same key. When the regex library needs to match two characters c1 and c2 and the flag std::regex_constants::collate is true, it executes regex_traits<>::translate(c1)…
std::regex_traits<CharT>::transform_primary – std::regex_traits<CharT>::transform_primary Synopsis template <class ForwardIt> string_type transform_primary(ForwardIt first, ForwardIt last) const; For the character sequence [first, last), obtains the primary sort key in the imbued locale’s collating order, that is, the sort key that is based on the positions of the letters and collation units in the national alphabet, ignoring case, diacritics, variants,…
std::regex_traits<CharT>::transform – std::regex_traits<CharT>::transform Synopsis template <class ForwardIt> string_type transform(ForwardIt first, ForwardIt last) const; Obtains the sort key for the character sequence [first, last), such that if a sort key compares less than another sort key with operator<, then the character sequence that produced the first sort key comes before the character sequence that produced the…
std::regex_traits<CharT>::regex_traits – std::regex_traits<CharT>::regex_traits Synopsis regex_traits(); Default-constructs the std::regex_traits object, including default-constructing the private std::locale member or any other internal state as necessary. Parameters (none) Return value (none) Example // Run this code #include <iostream> #include <regex> int main() { std::locale::global(std::locale("en_US.utf8")); std::regex_traits<char> r1; std::regex_traits<wchar_t> r2; std::cout << "The regex locale is " << r1.getloc().name() << ‘\n’;…
std::regex_traits<CharT>::lookup_collatename – std::regex_traits<CharT>::lookup_collatename Synopsis template <class ForwardIt> string_type lookup_collatename(ForwardIt first, ForwardIt last) const; If the character sequence [first, last) represents the name of a valid collating element in the currently imbued locale, returns the name of that collating element. Otherwise, returns an empty string. Collating elements are the symbols found in POSIX regular expressions between…
std::regex_traits<CharT>::lookup_classname – std::regex_traits<CharT>::lookup_classname Synopsis template <class ForwardIt> char_class_type lookup_classname(ForwardIt first, ForwardIt last, bool icase = false) const; If the character sequence [first, last) represents the name of a valid character class in the currently imbued locale (that is, the string between [: and :] in regular expressions), returns the implementation-defined value representing this character class….
std::regex_traits<CharT>::length – std::regex_traits<CharT>::length Synopsis static std::size_t length(const char_type *p); Calculates the length of a null – terminated character sequence, that is, the smallest i such that p[i] == 0. Standard library specializations of std::regex_traits execute std::char_traits<CharT>::length(p); Parameters p – pointer to the first element of the null-terminated character sequence Return value The length of the…
std::regex_traits<CharT>::isctype – std::regex_traits<CharT>::isctype Synopsis bool isctype(CharT c, char_class_type f) const; Determines whether the character c belongs to the character class identified by f, which, in turn, is a value returned by lookup_classname() or a bitwise OR of several such values. The version of this function provided in the standard library specializations of std::regex_traits does the…
std::regex_traits<CharT>::imbue – std::regex_traits<CharT>::imbue Synopsis locale_type imbue( locale_type loc ); (since C++11) Replaces the current locale with a copy of loc. If loc is different than the current locale, then all cached data is invalidated. After the call getloc() == loc. Parameters loc – the locale to imbue Return value The current locale of the traits…
std::regex_traits<CharT>::getloc – std::regex_traits<CharT>::getloc Synopsis locale_type getloc() const; (since C++11) Returns the current locale of the traits object. If imbue() has been never called for this object, then the global locale at the time of the call is returned. Otherwise, the locale passed to the last call to imbue() is returned. Parameters (none) Return value The…
std::regex_traits – std::regex_traits Synopsis Defined in header <regex> template< class CharT > (since C++11) class regex_traits; The type trait template regex_traits supplies std::basic_regex with the set of types and functions necessary to operate on the type CharT. Since many of regex operations are locale-sensitive (when std::regex_constants::collate flag is set), the regex_traits class typically holds an…
std::regex_token_iterator<BidirIt,CharT,Traits>::regex_token_iterator – std::regex_token_iterator<BidirIt,CharT,Traits>::regex_token_iterator Synopsis regex_token_iterator(); (1)(since C++ 11) regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type &re, int submatch = 0, (2)(since C++ 11) std::regex_constants::match_flag_type m = std::regex_constants::match_default); regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type &re, const std::vector<int> &submatches, (3)(since C++ 11) std::regex_constants::match_flag_type m = std::regex_constants::match_default); regex_token_iterator(BidirectionalIterator a, BidirectionalIterator b, const regex_type &re, std::initializer_list<int> submatches, (4)(since C++ 11)…
std::regex_search – std::regex_search Synopsis Defined in header<regex> template <class BidirIt, class Alloc, class CharT, class Traits> bool regex_search(BidirIt first, BidirIt last, std::match_results<BidirIt, Alloc> &m, (1)(since C++ 11) const std::basic_regex<CharT, Traits> &e, std::regex_constants::match_flag_type flags = std::regex_constants::match_default); template <class CharT, class Alloc, class Traits> bool regex_search(const CharT *str, std::match_results<const CharT *, Alloc> &m, (2)(since C++ 11) const…
std::regex_replace – std::regex_replace Synopsis Defined in header<regex> template <class OutputIt, class BidirIt, class Traits, class CharT, class STraits, class SAlloc> OutputIt regex_replace(OutputIt out, BidirIt first, BidirIt last, (1)(since C++ 11) const std::basic_regex<CharT, Traits> &re, const std::basic_string<CharT, STraits, SAlloc> &fmt, std::regex_constants::match_flag_type flags = std::regex_constants::match_default); template <class OutputIt, class BidirIt, class Traits, class CharT> OutputIt regex_replace(OutputIt out,…
std::regex_match – std::regex_match Synopsis Defined in header<regex> template <class BidirIt, class Alloc, class CharT, class Traits> bool regex_match(BidirIt first, BidirIt last, std::match_results<BidirIt, Alloc> &m, (1)(since C++ 11) const std::basic_regex<CharT, Traits> &e, std::regex_constants::match_flag_type flags = std::regex_constants::match_default); template <class BidirIt, class CharT, class Traits> bool regex_match(BidirIt first, BidirIt last, (2)(since C++ 11) const std::basic_regex<CharT, Traits> &e, std::regex_constants::match_flag_type…
std::regex_iterator<BidirIt,CharT,Traits>::regex_iterator – std::regex_iterator<BidirIt,CharT,Traits>::regex_iterator Synopsis regex_iterator(); (1)(since C++ 11) regex_iterator(BidirIt a, BidirIt b, const regex_type &re, (2)(since C++ 11) std::regex_constants::match_flag_type m = std::regex_constants::match_default); regex_iterator(const regex_iterator &); (3)(since C++ 11) regex_iterator(BidirIt, BidirIt, const regex_type &&, (4)(since C++ 14) std::regex_constants::match_flag_type = std::regex_constants::match_default) = delete; Constructs a new regex_iterator: 1) Default constructor. Constructs an end-of-sequence iterator. 2) Constructs a…
std::regex_error::regex_error – std::regex_error::regex_error Synopsis Defined in header <regex> regex_error(std::regex_constants::error_type ecode); (since C++11) Constructs a regex_error with a given ecode of type std::regex_constants::error_type . See Also error_type describes different types of matching errors (typedef) (C++11)