70 lines
3.0 KiB
C++
70 lines
3.0 KiB
C++
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//
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// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
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// Copyright (c) 2023 Alexander Grund
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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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int main()
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{
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if(boost::locale::localization_backend_manager::global().get_all_backends().at(0) != "icu")
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std::wcout << L"Need ICU support for this example!\nConversion below will likely be wrong!\n";
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// Create system default locale
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boost::locale::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 a 1-to-1 conversion.\n";
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std::wcout << L"For example:\n";
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const std::wstring gruessen(L"grüßen");
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std::wcout << L" German " << gruessen << " would be incorrectly converted to " << boost::to_upper_copy(gruessen);
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std::wcout << ", while Boost.Locale converts it to " << boost::locale::to_upper(gruessen) << std::endl
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<< L" where ß is replaced with SS.\n";
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const std::wstring greek(L"ὈΔΥΣΣΕΎΣ");
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std::wcout << L" Greek " << greek << " would be incorrectly converted to " << boost::to_lower_copy(greek);
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std::wcout << ", while Boost.Locale correctly converts it to " << boost::locale::to_lower(greek) << std::endl
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<< L" where Σ is converted to σ or to ς, according to position in the word.\n";
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std::wcout
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<< L"Such type of conversion just can't be done using std::toupper/boost::to_upper* that work on character "
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L"by character base.\n"
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L"Also std::toupper is not fully applicable when working with variable character length like UTF-8 or UTF-16\n"
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L"limiting the correct behavior to BMP or ASCII only\n";
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}
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// boostinspect:noascii
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