| 1 | // |
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| 2 | // Copyright (c) 2009-2011 Artyom Beilis (Tonkikh) |
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| 3 | // Copyright (c) 2023 Alexander Grund |
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| 4 | // |
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| 5 | // Distributed under the Boost Software License, Version 1.0. |
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| 6 | // https://www.boost.org/LICENSE_1_0.txt |
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| 7 | |
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| 8 | #include <boost/locale.hpp> |
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| 9 | #include <boost/algorithm/string/case_conv.hpp> |
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| 10 | #include <iostream> |
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| 11 | |
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| 12 | int main() |
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| 13 | { |
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| 14 | if(boost::locale::localization_backend_manager::global().get_all_backends().at(n: 0) != "icu" ) |
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| 15 | std::cout << "Need ICU support for this example!\nConversion below will likely be wrong!\n" ; |
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| 16 | |
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| 17 | // Create system default locale |
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| 18 | boost::locale::generator gen; |
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| 19 | std::locale loc = gen("" ); |
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| 20 | std::locale::global(loc: loc); |
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| 21 | std::cout.imbue(loc: loc); |
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| 22 | |
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| 23 | // This is needed to prevent the C stdio library from |
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| 24 | // converting strings to narrow on some platforms |
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| 25 | std::ios_base::sync_with_stdio(sync: false); |
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| 26 | |
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| 27 | std::cout << "Correct case conversion can't be done by simple, character by character conversion\n" ; |
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| 28 | std::cout << "because case conversion is context sensitive and not a 1-to-1 conversion.\n" ; |
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| 29 | std::cout << "For example:\n" ; |
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| 30 | const std::string gruessen("grüßen" ); |
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| 31 | std::cout << " German " << gruessen << " would be incorrectly converted to " << boost::to_upper_copy(Input: gruessen); |
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| 32 | std::cout << ", while Boost.Locale converts it to " << boost::locale::to_upper(str: gruessen) << std::endl |
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| 33 | << " where ß is replaced with SS.\n" ; |
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| 34 | const std::string greek("ὈΔΥΣΣΕΎΣ" ); |
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| 35 | std::cout << " Greek " << greek << " would be incorrectly converted to " << boost::to_lower_copy(Input: greek); |
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| 36 | std::cout << ", while Boost.Locale correctly converts it to " << boost::locale::to_lower(str: greek) << std::endl |
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| 37 | << " where Σ is converted to σ or to ς, according to position in the word.\n" ; |
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| 38 | std::cout |
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| 39 | << "Such type of conversion just can't be done using std::toupper/boost::to_upper* that work on character " |
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| 40 | "by character base.\n" |
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| 41 | "Also std::toupper is not fully applicable when working with variable character length like UTF-8 or UTF-16\n" |
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| 42 | "limiting the correct behavior to BMP or ASCII only\n" ; |
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| 43 | } |
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| 44 | |
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| 45 | // boostinspect:noascii |
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| 46 | |
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