algorithm/string -- find_all_regex() gives a compiler error when the result container is vector<iterator_range<string::iterator>>

Inizia riproducendo la chiamata fornita a boost::find_all_regex con std::vector<boost::iterator_rangestd::string::iterator> e confrontala con il caso std::vectorstd::string. Leggi la documentazione collegata di find_all_regex e l'implementazione della funzione; il lavoro è completato quando la discrepanza documentata del contenitore viene risolta oppure la documentazione viene corretta chiaramente, con l'esempio segnalato coperto se sono disponibili test.

The doc says that the container we should pass to this function can be std::vector<boost::iterator_rangestd::string::iterator>. But when I run the program it gives a compile error. But when the result container passed, is a std::vectorstd::string, everything works fine.

First code snippet is using std::vector<boost::iterator_rangestd::string::iterator> as the result.

#include "boost/algorithm/string/split.hpp"
#include "boost/range/iterator_range_core.hpp"
#include <iostream>
#include <boost/algorithm/string.hpp>
#include <boost/algorithm/string/regex.hpp>
#include <vector>

int main(int, char**) {
    
    std::string s("Hello world");
    boost::regex regex("\\w");

    std::vector<boost::iterator_range<std::string::iterator>> result;
    boost::find_all_regex(result, s, regex);

}

Following is the last 3 lines of the compiler error. The whole error is too long.

c:\mingw\include\c++\9.2.0\bits\stl_iterator.h:787:11: note: no known conversion for argument 1 from '__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string >' to 'const __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string >&'

c:\mingw\include\c++\9.2.0\bits\stl_iterator.h:787:11: note: candidate: 'constexpr __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string >::__normal_iterator(__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string >&&)'

c:\mingw\include\c++\9.2.0\bits\stl_iterator.h:787:11: note: no known conversion for argument 1 from '__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string >' to '__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string >&&'

Also I ran the same program in Clang compiler too. Still the same result.

But when I run the following program with the container as std::vectorstd::string everything works without a hitch.

#include "boost/algorithm/string/split.hpp"
#include "boost/range/iterator_range_core.hpp"
#include <iostream>
#include <boost/algorithm/string.hpp>
#include <boost/algorithm/string/regex.hpp>
#include <string>
#include <vector>

int main(int, char**) {
    
    std::string s("Hello world");
    boost::regex regex("\\w");

    std::vector<std::string> result;
    boost::find_all_regex(result, s, regex);

}