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#include <string>
#include <string_view>
#include <iostream>
#include <boost/algorithm/string.hpp>
int main()
{
        auto str = std::string_view{""};
 
        for( boost::algorithm::split_iterator<std::string_view::iterator> i
//    = make_split_iterator(str, token_finder(is_space()));
            = make_split_iterator(str, boost::first_finder(","));
             i != boost::algorithm::split_iterator<std::string_view::iterator>();
             ++i)
        {
                std::cout << *i << '\n';
        }
        std::cout << "ok";
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:7:25: error: ‘string_view’ is not a member of ‘std’
         auto str = std::string_view{""};
                         ^~~~~~~~~~~
prog.cpp:7:25: note: ‘std::string_view’ is only available from C++17 onwards
prog.cpp:9:52: error: ‘string_view’ is not a member of ‘std’
         for( boost::algorithm::split_iterator<std::string_view::iterator> i
                                                    ^~~~~~~~~~~
prog.cpp:9:52: note: ‘std::string_view’ is only available from C++17 onwards
prog.cpp:9:52: error: ‘string_view’ is not a member of ‘std’
prog.cpp:9:52: note: ‘std::string_view’ is only available from C++17 onwards
prog.cpp:9:73: error: template argument 1 is invalid
         for( boost::algorithm::split_iterator<std::string_view::iterator> i
                                                                         ^
prog.cpp:12:57: error: ‘string_view’ is not a member of ‘std’
              i != boost::algorithm::split_iterator<std::string_view::iterator>();
                                                         ^~~~~~~~~~~
prog.cpp:12:57: note: ‘std::string_view’ is only available from C++17 onwards
prog.cpp:12:57: error: ‘string_view’ is not a member of ‘std’
prog.cpp:12:57: note: ‘std::string_view’ is only available from C++17 onwards
prog.cpp:12:78: error: template argument 1 is invalid
              i != boost::algorithm::split_iterator<std::string_view::iterator>();
                                                                              ^
prog.cpp:15:31: error: invalid type argument of unary ‘*’ (have ‘int’)
                 std::cout << *i << '\n';
                               ^

Standard output is empty