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67 lines
2.7 KiB
C++
67 lines
2.7 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.
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// https://www.boost.org/LICENSE_1_0.txt
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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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// Create system default locale
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generator gen;
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std::locale loc = gen("");
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std::locale::global(loc);
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std::wcout.imbue(loc);
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// This is needed to prevent the C stdio library from
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// converting strings to narrow on some platforms
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std::ios_base::sync_with_stdio(false);
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std::wcout << L"Correct case conversion can't be done by simple, character by character conversion\n";
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std::wcout << L"because case conversion is context sensitive and not 1-to-1 conversion\n";
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std::wcout << L"For example:\n";
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std::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")) << std::endl;
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std::wcout << L" where ß is replaced with SS\n";
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std::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")) << std::endl;
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std::wcout << L" where Σ is converted to σ or to ς, according to position in the word\n";
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std::wcout << L"Such type of conversion just can't be done using std::toupper that work on character base, also "
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L"std::toupper is \n";
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std::wcout << L"not fully applicable when working with variable character length like in UTF-8 or UTF-16 limiting "
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L"the correct \n";
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std::wcout << L"behavoir to BMP or ASCII only\n";
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}
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// boostinspect:noascii
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