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