use_facet.cpp

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#include <iostream>     // for cout
#include <locale>       // for locale
 
#include <examples.h>
 
int main ()
{
    std::locale loc;
 
    // Get a ctype facet
    const std::ctype<char>&
        ct = std::use_facet<std::ctype<char> >(loc); 
 
    std::cout << 'a' << ct.toupper('c') << std::endl;
 
    return 0;
}