Example of using various text conversion functions with wide strings.
#include <boost/locale.hpp>
#include <boost/algorithm/string/case_conv.hpp>
#include <iostream>
#include <ctime>
int main()
{
    using namespace boost::locale;
    using namespace std;
    
    locale loc=gen(""); 
    locale::global(loc);
    wcout.imbue(loc);
    
    
    
    std::ios_base::sync_with_stdio(false);
    
    wcout<<L"Correct case conversion can't be done by simple, character by character conversion"<<endl;
    wcout<<L"because case conversion is context sensitive and not 1-to-1 conversion"<<endl;
    wcout<<L"For example:"<<endl;
    wcout<<L
"   German grüßen correctly converted to "<<
to_upper(L
"grüßen")<<L
", instead of incorrect "                    <<boost::to_upper_copy(std::wstring(L"grüßen"))<<endl;
    wcout<<L"     where ß is replaced with SS"<<endl;
    wcout<<L
"   Greek ὈΔΥΣΣΕΎΣ is correctly converted to "<<
to_lower(L
"ὈΔΥΣΣΕΎΣ")<<L
", instead of incorrect "                    <<boost::to_lower_copy(std::wstring(L"ὈΔΥΣΣΕΎΣ"))<<endl;
    wcout<<L"     where Σ is converted to σ or to ς, according to position in the word"<<endl;
    wcout<<L"Such type of conversion just can't be done using std::toupper that work on character base, also std::toupper is "<<endl;
    wcout<<L"not fully applicable when working with variable character length like in UTF-8 or UTF-16 limiting the correct "<<endl;
    wcout<<L"behavoir to BMP or ASCII only"<<endl;
   
}