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84aa100af1
Make it clear which output is from Boost.Locale and what is the expected behavior by changing the order. Also check for ICU support as only ICU is able to do that conversion. Closes #51
70 lines
3.0 KiB
C++
70 lines
3.0 KiB
C++
//
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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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