74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
//
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// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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//
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// ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
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//
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// BIG FAT WARNING FOR Microsoft Visual Studio Users
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//
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// YOU NEED TO CONVERT THIS SOURCE FILE ENCODING TO UTF-8 WITH BOM ENCODING.
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//
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// Unfortunately MSVC understands that the source code is encoded as
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// UTF-8 only if you add useless BOM in the beginning.
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//
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// So, before you compile "wide" examples with MSVC, please convert them to text
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// files with BOM. There are two very simple ways to do it:
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//
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// 1. Open file with Notepad and save it from there. It would convert
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// it to file with BOM.
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// 2. In Visual Studio go File->Advances Save Options... and select
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// Unicode (UTF-8 with signature) Codepage 65001
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//
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// Note: once converted to UTF-8 with BOM, this source code would not
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// compile with other compilers, because no-one uses BOM with UTF-8 today
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// because it is absolutely meaningless in context of UTF-8.
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//
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// ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
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//
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#include <boost/locale.hpp>
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#include <boost/algorithm/string/case_conv.hpp>
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#include <iostream>
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#include <ctime>
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int main()
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{
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using namespace boost::locale;
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using namespace std;
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// Create system default locale
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generator gen;
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locale loc=gen("");
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locale::global(loc);
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wcout.imbue(loc);
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// This is needed to prevent C library to
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// convert strings to narrow
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// instead of C++ on some platforms
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std::ios_base::sync_with_stdio(false);
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wcout<<L"Correct case conversion can't be done by simple, character by character conversion"<<endl;
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wcout<<L"because case conversion is context sensitive and not 1-to-1 conversion"<<endl;
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wcout<<L"For example:"<<endl;
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wcout<<L" German grüßen correctly converted to "<<to_upper(L"grüßen")<<L", instead of incorrect "
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<<boost::to_upper_copy(std::wstring(L"grüßen"))<<endl;
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wcout<<L" where ß is replaced with SS"<<endl;
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wcout<<L" Greek ὈΔΥΣΣΕΎΣ is correctly converted to "<<to_lower(L"ὈΔΥΣΣΕΎΣ")<<L", instead of incorrect "
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<<boost::to_lower_copy(std::wstring(L"ὈΔΥΣΣΕΎΣ"))<<endl;
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wcout<<L" where Σ is converted to σ or to ς, according to position in the word"<<endl;
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wcout<<L"Such type of conversion just can't be done using std::toupper that work on character base, also std::toupper is "<<endl;
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wcout<<L"not fully applicable when working with variable character length like in UTF-8 or UTF-16 limiting the correct "<<endl;
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wcout<<L"behavoir to BMP or ASCII only"<<endl;
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}
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// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
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// boostinspect:noascii
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