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								// Copyright 2021 Peter Dimov.
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								// Distributed under the Boost Software License, Version 1.0.
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								// http://www.boost.org/LICENSE_1_0.txt
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								#include <boost/system/error_code.hpp>
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								#include <boost/core/lightweight_test.hpp>
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								#include <cerrno>
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								#include <system_error>
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								int main()
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								{
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								    {
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								        std::error_code e1;
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								        boost::system::error_code e2 = e1;
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								        BOOST_TEST( !e2.failed() );
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								        BOOST_TEST_EQ( e1.message(), e2.message() );
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								        std::error_code e3 = e2;
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								        BOOST_TEST_EQ( e1, e3 );
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								    }
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								    {
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								        std::error_code e1( 5, std::system_category() );
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								        boost::system::error_code e2 = e1;
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								        BOOST_TEST( e2.failed() );
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								        BOOST_TEST_EQ( e1.message(), e2.message() );
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								        std::error_code e3 = e2;
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								        BOOST_TEST_EQ( e1, e3 );
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								    }
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								    {
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								        std::error_code e1( 0, std::generic_category() );
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								        boost::system::error_code e2 = e1;
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								        BOOST_TEST( !e2.failed() );
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								        BOOST_TEST_EQ( e1.message(), e2.message() );
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								        std::error_code e3 = e2;
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								        BOOST_TEST_EQ( e1, e3 );
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								    }
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								    {
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								        std::error_code e1( ENOENT, std::generic_category() );
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								        boost::system::error_code e2 = e1;
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								        BOOST_TEST( e2.failed() );
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								        BOOST_TEST_EQ( e1.message(), e2.message() );
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								        std::error_code e3 = e2;
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								        BOOST_TEST_EQ( e1, e3 );
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								    }
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								    {
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								        std::error_code e1 = make_error_code( std::errc::no_such_file_or_directory );
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								        boost::system::error_code e2 = e1;
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								        BOOST_TEST( e2.failed() );
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								        BOOST_TEST_EQ( e1.message(), e2.message() );
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								        std::error_code e3 = e2;
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								        BOOST_TEST_EQ( e1, e3 );
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								    }
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								    return boost::report_errors();
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								}
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