73 lines
3.1 KiB
C++
73 lines
3.1 KiB
C++
// test_codecvt.hpp ------------------------------------------------------------------//
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// Copyright Beman Dawes 2009, 2010
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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// Library home page: http://www.boost.org/libs/filesystem
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#ifndef BOOST_FILESYSTEM_TEST_CODECVT_HPP
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#define BOOST_FILESYSTEM_TEST_CODECVT_HPP
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#include <boost/filesystem/config.hpp>
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#include <locale>
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#include <cwchar> // for mbstate_t
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//------------------------------------------------------------------------------------//
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// //
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// class test_codecvt //
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// //
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// Warning: partial implementation; even do_in and do_out only partially meet the //
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// standard library specifications as the "to" buffer must hold the entire result. //
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// //
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// The value of a wide character is the value of the corresponding narrow character //
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// plus 1. This ensures that compares against expected values will fail if the //
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// code conversion did not occur as expected. //
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// //
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//------------------------------------------------------------------------------------//
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class test_codecvt :
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public std::codecvt< wchar_t, char, std::mbstate_t >
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{
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public:
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explicit test_codecvt() :
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std::codecvt< wchar_t, char, std::mbstate_t >()
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{
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}
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protected:
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virtual bool do_always_noconv() const throw() { return false; }
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virtual int do_encoding() const throw() { return 0; }
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virtual std::codecvt_base::result do_in(std::mbstate_t&, const char* from, const char* from_end, const char*& from_next, wchar_t* to, wchar_t* to_end, wchar_t*& to_next) const
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{
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for (; from != from_end && to != to_end; ++from, ++to)
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*to = wchar_t(*from + 1);
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if (to == to_end)
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return error;
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*to = L'\0';
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from_next = from;
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to_next = to;
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return ok;
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}
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virtual std::codecvt_base::result do_out(std::mbstate_t&, const wchar_t* from, const wchar_t* from_end, const wchar_t*& from_next, char* to, char* to_end, char*& to_next) const
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{
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for (; from != from_end && to != to_end; ++from, ++to)
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*to = static_cast< char >(*from - 1);
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if (to == to_end)
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return error;
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*to = '\0';
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from_next = from;
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to_next = to;
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return ok;
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}
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virtual std::codecvt_base::result do_unshift(std::mbstate_t&, char* /*from*/, char* /*to*/, char*& /*next*/) const { return ok; }
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virtual int do_length(std::mbstate_t&, const char* /*from*/, const char* /*from_end*/, std::size_t /*max*/) const { return 0; }
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virtual int do_max_length() const throw() { return 0; }
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};
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#endif // BOOST_FILESYSTEM_TEST_CODECVT_HPP
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