Boost.Locale: wconversions.cpp

//

//  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;


}


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// boostinspect:noascii