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wconversions.cpp

Example of using various text conversion functions with wide strings.

    //
    //  Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
    //
    //  Distributed under the Boost Software License, Version 1.0. (See
    //  accompanying file LICENSE_1_0.txt or copy at
    //  http://www.boost.org/LICENSE_1_0.txt)
    //

    //
    // ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
    //
    // BIG FAT WARNING FOR Microsoft Visual Studio Users
    //
    // YOU NEED TO CONVERT THIS SOURCE FILE ENCODING TO UTF-8 WITH BOM ENCODING.
    //
    // Unfortunately MSVC understands that the source code is encoded as
    // UTF-8 only if you add useless BOM in the beginning.
    //
    // So, before you compile "wide" examples with MSVC, please convert them to text
    // files with BOM. There are two very simple ways to do it:
    //
    // 1. Open file with Notepad and save it from there. It would convert
    //    it to file with BOM.
    // 2. In Visual Studio go File->Advances Save Options... and select
    //    Unicode (UTF-8  with signature) Codepage 65001
    //
    // Note: once converted to UTF-8 with BOM, this source code would not
    // compile with other compilers, because no-one uses BOM with UTF-8 today
    // because it is absolutely meaningless in context of UTF-8.
    //
    // ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
    //
    #include <boost/locale.hpp>
    #include <boost/algorithm/string/case_conv.hpp>
    #include <iostream>

    #include <ctime>

    int main()
    {
        using namespace boost::locale;
        using namespace std;
        // Create system default locale
        generator gen;
        locale loc=gen("");
        locale::global(loc);
        wcout.imbue(loc);

        // This is needed to prevent C library to
        // convert strings to narrow
        // instead of C++ on some platforms
        std::ios_base::sync_with_stdio(false);

        wcout<<L"Correct case conversion can't be done by simple, character by character conversion"<<endl;
        wcout<<L"because case conversion is context sensitive and not 1-to-1 conversion"<<endl;
        wcout<<L"For example:"<<endl;
        wcout<<L"   German grüßen correctly converted to "<<to_upper(L"grüßen")<<L", instead of incorrect "
                        <<boost::to_upper_copy(std::wstring(L"grüßen"))<<endl;
        wcout<<L"     where ß is replaced with SS"<<endl;
        wcout<<L"   Greek ὈΔΥΣΣΕΎΣ is correctly converted to "<<to_lower(L"ὈΔΥΣΣΕΎΣ")<<L", instead of incorrect "
                        <<boost::to_lower_copy(std::wstring(L"ὈΔΥΣΣΕΎΣ"))<<endl;
        wcout<<L"     where Σ is converted to σ or to ς, according to position in the word"<<endl;
        wcout<<L"Such type of conversion just can't be done using std::toupper that work on character base, also std::toupper is "<<endl;
        wcout<<L"not fully applicable when working with variable character length like in UTF-8 or UTF-16 limiting the correct "<<endl;
        wcout<<L"behavoir to BMP or ASCII only"<<endl;

    }

    // vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4

    // boostinspect:noascii