id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
9853,"'argument' : conversion from 'int' to 'char', possible loss of data",nn1436401@…,Vladimir Prus,"boost_program_options.1.55.0.16\lib\native\src\parsers.cpp(223): warning C4242: 'argument' : conversion from 'int' to 'char', possible loss of data

tolower returns 'int' and not 'char'.
The cast must be used:

{{{#!cpp
result += static_cast<char>(tolower(s[n]));
}}}

{{{#!cpp
                string result;
                if (s.find(prefix) == 0) {
                    for(string::size_type n = prefix.size(); n < s.size(); ++n) 
                    {   
                        // Intel-Win-7.1 does not understand
            // push_back on string.         
                        result += tolower(s[n]);
                    }
}}}

P.S.
Also it is better to use boost algorithm tolower on string rather than writing it by ourselves.",Bugs,closed,To Be Determined,program_options,Boost 1.55.0,Problem,fixed,,