22.locale.codecvt.stdcxx-435.cpp

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#include <cassert>
#include <clocale>
#include <cwchar>
#include <locale>
 
int main ()
{
    // multibyte locale
    std::locale mbloc;
 
    // names of some well-known multibyte locales
    const char* const names[] = {
        "EN_US.UTF-8",   // AIX
        "en_US.UTF-8",   // AIX, Linux, Solaris
        "en_US.utf8",    // HP-UX
 
        // starting with Vista, Windows follows RFC 4646 name format
        // http://msdn2.microsoft.com/en-us/library/ms776260(VS.85).aspx
        "hy-AM",  // Win 2000
        "as-IN",  // Win Vista
        "bn-IN",  // Win XP SP2
        "zh-HK",
        "zh-CN",
 
        0
    };
 
    // try to find the first multibyte locale on this system
    for (unsigned i = 0; names [i]; ++i) {
        if (std::setlocale (LC_ALL, names [i])) {
            mbloc = std::locale (names [i]);
            break;
        }
    }
 
    // fall back on the "C" locale...
 
    typedef std::codecvt<wchar_t, char, std::mbstate_t> MbCvt;
 
    const MbCvt &cvt = std::use_facet<MbCvt>(mbloc);
 
    // source and destination buffers
    const char src[] = "abc";
    wchar_t dst [2] = { L'\0', L'\1' };
 
    const char* from_next;
 
    wchar_t* to_next;
 
    std::mbstate_t state = std::mbstate_t ();
 
    // convert exactly one source character, expect exactly
    // one wide character in the destination buffer
    const std::codecvt_base::result res =
        cvt.in (state,
                src, src + 1, from_next,
                dst, dst + 2, to_next);
 
    assert (cvt.ok == res);
    assert (1 == from_next - src);
    assert (1 == to_next - dst);
    assert ('a' == dst [0] && '\1' == dst [1]);
}