regex_iterator::operator++
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regex_iterator::operator++

Increments the iterator.

regex_iterator& operator++();
regex_iterator& operator++(int);

If the current match has no characters the first operator calls regex_search(begin, end, match, *pregex, flags | regex_constants::match_prev_avail | regex_constants::match_not_null); otherwise it advances the stored value begin to point to the first character after the current match then calls regex_search(begin, end, match, *pregex, flags | regex_constants::match_prev_avail). In either case, if the search fails the operator sets the object to an end-of-sequence iterator. The operator returns the object.

The second operator makes a copy of the object, increments the object, then returns the copy.

 

// std_tr1__regex__regex_iterator_operator_inc.cpp 
// compile with: /EHsc 
#include <regex> 
#include <iostream> 
 
typedef std::tr1::regex_iterator<const char *> Myiter; 
int main() 
    { 
    const char *pat = "axayaz"; 
    Myiter::regex_type rx("a"); 
    Myiter next(pat, pat + strlen(pat), rx); 
    Myiter end; 
 
    for (; next != end; ++next) 
        std::cout << "match == " << next->str() << std::endl; 
 
// other members 
    Myiter it1(pat, pat + strlen(pat), rx); 
    Myiter it2(it1); 
    next = it1; 
 
    Myiter::iterator_category cat = std::forward_iterator_tag(); 
    Myiter::difference_type dif = -3; 
    Myiter::value_type mr = *it1; 
    Myiter::reference ref = mr; 
    Myiter::pointer ptr = &ref; 
 
    dif = dif; // to quiet "unused" warnings 
    ptr = ptr; 
 
    return (0); 
    } 
 
match == a match == a match == a

Header: <regex>

Namespace: std::tr1

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