ceph/src/boost/libs/locale/examples/wconversions.cpp

   1 //
   2 //  Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
   3 //
   4 //  Distributed under the Boost Software License, Version 1.0. (See
   5 //  accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8
   9 //
  10 // ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
  11 //
  12 // BIG FAT WARNING FOR Microsoft Visual Studio Users
  13 //
  14 // YOU NEED TO CONVERT THIS SOURCE FILE ENCODING TO UTF-8 WITH BOM ENCODING.
  15 //
  16 // Unfortunately MSVC understands that the source code is encoded as
  17 // UTF-8 only if you add useless BOM in the beginning.
  18 //
  19 // So, before you compile "wide" examples with MSVC, please convert them to text
  20 // files with BOM. There are two very simple ways to do it:
  21 //
  22 // 1. Open file with Notepad and save it from there. It would convert
  23 //    it to file with BOM.
  24 // 2. In Visual Studio go File->Advances Save Options... and select
  25 //    Unicode (UTF-8  with signature) Codepage 65001
  26 //
  27 // Note: once converted to UTF-8 with BOM, this source code would not
  28 // compile with other compilers, because no-one uses BOM with UTF-8 today
  29 // because it is absolutely meaningless in context of UTF-8.
  30 //
  31 // ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
  32 //
  33 #include <boost/locale.hpp>
  34 #include <boost/algorithm/string/case_conv.hpp>
  35 #include <iostream>
  36
  37 #include <ctime>
  38
  39
  40 int main()
  41 {
  42     using namespace boost::locale;
  43     using namespace std;
  44     // Create system default locale
  45     generator gen;
  46     locale loc=gen("");
  47     locale::global(loc);
  48     wcout.imbue(loc);
  49
  50     // This is needed to prevent C library to
  51     // convert strings to narrow
  52     // instead of C++ on some platforms
  53     std::ios_base::sync_with_stdio(false);
  54
  55
  56     wcout<<L"Correct case conversion can't be done by simple, character by character conversion"<<endl;
  57     wcout<<L"because case conversion is context sensitive and not 1-to-1 conversion"<<endl;
  58     wcout<<L"For example:"<<endl;
  59     wcout<<L"   German grüßen correctly converted to "<<to_upper(L"grüßen")<<L", instead of incorrect "
  60                     <<boost::to_upper_copy(std::wstring(L"grüßen"))<<endl;
  61     wcout<<L"     where ß is replaced with SS"<<endl;
  62     wcout<<L"   Greek ὈΔΥΣΣΕΎΣ is correctly converted to "<<to_lower(L"ὈΔΥΣΣΕΎΣ")<<L", instead of incorrect "
  63                     <<boost::to_lower_copy(std::wstring(L"ὈΔΥΣΣΕΎΣ"))<<endl;
  64     wcout<<L"     where Σ is converted to σ or to ς, according to position in the word"<<endl;
  65     wcout<<L"Such type of conversion just can't be done using std::toupper that work on character base, also std::toupper is "<<endl;
  66     wcout<<L"not fully applicable when working with variable character length like in UTF-8 or UTF-16 limiting the correct "<<endl;
  67     wcout<<L"behavoir to BMP or ASCII only"<<endl;
  68
  69 }
  70
  71 // vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
  72
  73 // boostinspect:noascii