std::regex_token_iterator<BidirIt,CharT,Traits>::regex_token_iterator
regex_token_iterator(); |
(1) | (since C++11) |
regex_token_iterator( BidirIt a, BidirIt b, const regex_type& re, int submatch = 0, std::regex_constants::match_flag_type m = std::regex_constants::match_default ); |
(2) | (since C++11) |
regex_token_iterator( BidirIt a, BidirIt b, const regex_type& re, const std::vector<int>& submatches, std::regex_constants::match_flag_type m = std::regex_constants::match_default ); |
(3) | (since C++11) |
regex_token_iterator( BidirIt a, BidirIt b, const regex_type& re, std::initializer_list<int> submatches, std::regex_constants::match_flag_type m = std::regex_constants::match_default ); |
(4) | (since C++11) |
template <std::size_t N> regex_token_iterator( BidirIt a, BidirIt b, const regex_type& re, const int (&submatches)[N], std::regex_constants::match_flag_type m = std::regex_constants::match_default ); |
(5) | (since C++11) |
regex_token_iterator( const regex_token_iterator& other ); |
(6) | (since C++11) |
regex_token_iterator( BidirIt a, BidirIt b, const regex_type&& re, int submatch = 0, std::regex_constants::match_flag_type m = std::regex_constants::match_default ) = delete; |
(7) | (since C++11) |
regex_token_iterator( BidirIt a, BidirIt b, const regex_type&& re, const std::vector<int>& submatches, std::regex_constants::match_flag_type m = std::regex_constants::match_default ) = delete; |
(8) | (since C++11) |
regex_token_iterator( BidirIt a, BidirIt b, const regex_type&& re, std::initializer_list<int> submatches, std::regex_constants::match_flag_type m = std::regex_constants::match_default ) = delete; |
(9) | (since C++11) |
template <std::size_t N> regex_token_iterator( BidirIt a, BidirIt b, const regex_type&& re, const int (&submatches)[N], std::regex_constants::match_flag_type m = std::regex_constants::match_default ) = delete; |
(10) | (since C++11) |
Constructs a new regex_token_iterator
:
1) Default constructor. Constructs the end-of-sequence iterator.
2-5) First, copies the list of the requested submatch out of the
submatches
or
submatch
argument into the member list stored in the iterator and constructs the member
std::regex_iterator
by passing
a
,
b
,
re
, and
m
to its four-argument constructor (that constructor performs the initial call to
std::regex_search
) and sets the internal counter of submatches to zero.
- If, after construction, the member
regex_iterator
is not an end-of-sequence iterator, sets the member pointer to the address of the currentstd::sub_match
. - Otherwise (if the member
regex_iterator
is an end-of-sequence iterator), but the value-1
is one of the values insubmatches
/submatch
, turns*this
into a suffix iterator pointing at the range[a,b)
(the entire string is the non-matched suffix) - Otherwise (if -1 is not in the list of submatches), turns
*this
into the end-of-sequence iterator.
The behavior is undefined if any value in submatches
is less than -1
.
6) Copy constructor: performs member-wise copy (including making a copy of the member
regex_iterator
and the member pointer to current
sub_match
).
7-10) The overloads
(2-5) are prohibited from being called with a temporary regex since otherwise the returned iterator would be immediately invalidated
Parameters
a | - | LegacyBidirectionalIterator to the beginning of the target character sequence |
b | - | LegacyBidirectionalIterator to the end of the target character sequence |
re | - | regular expression used to search the target character sequence |
submatch | - | the index of the submatch that should be returned. "0" represents the entire match, and "-1" represents the parts that are not matched (e.g, the stuff between matches). |
submatches | - | the sequence of submatch indices that should be iterated over within each match, may include the special value -1 for the non-matched fragments |
m | - | flags that govern the behavior of re |
Example
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
LWG 2332 | C++11 | a regex_token_iterator constructed from atemporary basic_regex became invalid immediately |
such construction is disallowed via deleted overloads |
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