#include <iostream>
#include <string>
#include <sstream>      /// istringstream
 
 
using namespace std;
 
 
template<typename S>
void StreamLocaleName(S& s,
                      string m)
{
    /// Get the stream's locale.
    locale loc = s.rdbuf()->getloc();
 
    /// Display locale name.
    cout << m << "'s locale: "
         << loc.name() << endl;
}
 
 
int main()
{
   string s {};
   istringstream iss {s};
 
   /// Display the istringstream's initial locale name.
   StreamLocaleName(iss, "iss");
 
   /// Set the istringstream's locale to POSIX
   locale posix {"POSIX"};
   iss.imbue(posix);
 
   /// Display the istringstream's new locale name.
   StreamLocaleName(iss, "iss");
}

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