学步园

#include <locale><br /> #include <iostream><br /> #include <string><br /> #include <sstream><br /> using namespace std ;</p> <p> wstring widen( const string& str )<br /> {<br /> wostringstream wstm ;<br /> const ctype<wchar_t>& ctfacet =<br /> use_facet< ctype<wchar_t> >( wstm.getloc() ) ;<br /> for( size_t i=0 ; i<str.size() ; ++i )<br /> wstm << ctfacet.widen( str[i] ) ;<br /> return wstm.str() ;<br /> }<br /> string narrow( const wstring& str )<br /> {<br /> ostringstream stm ;<br /> const ctype<char>& ctfacet =<br /> use_facet< ctype<char> >( stm.getloc() ) ;<br /> for( size_t i=0 ; i<str.size() ; ++i )<br /> stm << ctfacet.narrow( str[i], 0 ) ;<br /> return stm.str() ;<br /> }<br /> int main()<br /> {<br /> const char* cstr = "abcdefghijkl" ;<br /> const wchar_t* wcstr = widen(cstr).c_str() ;<br /> wcout << wcstr << L'/n' ;</p> <p> const wchar_t* wcstr = L"mnopqrstuvwx" ;<br /> const char* cstr = narrow(wcstr).c_str() ;<br /> cout << cstr << '/n' ;<br /> }