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    <p>Unicode string literals support <a href="http://gcc.gnu.org/projects/cxx0x.html" rel="nofollow">began</a> in GCC 4.5. Maybe that's the problem.</p> <p><strong>[edit]</strong></p> <p>After some digging I've found that streams for this new unicode literals are described in <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2035.pdf" rel="nofollow">N2035</a> and it was <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2870.html" rel="nofollow">included</a> in a draft of the standard. According to this document you need <code>u32ofstream</code> to output you string but this class is absent in GCC 4.5 C++0x library.</p> <p>As a workaround you can use ordinary fstream:</p> <pre><code>std::ofstream fout2("output2.txt", std::ios::out | std::ios::binary); fout2.write((const char *)str.c_str(), str.size() * 4); </code></pre> <p>This way I've output your string in UTF-32LE on my Intel machine (which is little-endian).</p> <p><strong>[edit]</strong></p> <p>I was a little bit wrong about the status of <code>u32ofstream</code>: according to the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf" rel="nofollow">latest draft</a> on the The C++ Standards Committee's <a href="http://www.open-std.org/jtc1/sc22/wg21/" rel="nofollow">web site</a> you have to use <code>std::basic_ofstream&lt;char32_t&gt;</code> as you did. This class would use <code>codecvt&lt;char32_t,char,typename traits::state_type&gt;</code> class (see end of §27.9.1.1) which has to be implemented in the standard library (search <code>codecvt&lt;char32_t</code> in the document), but it's not available in GCC 4.5.</p>
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    1. COI'm running gcc 4.5.2 and getting the same result as the OP :(
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    2. COAccording to Grigory Javadyan it's not a problem. :(
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    3. COI've tried with my gcc 4.5 and edited my answer
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