#ifndef BOOST_SYSTEM_DETAIL_ERROR_CODE_HPP_INCLUDED
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#define BOOST_SYSTEM_DETAIL_ERROR_CODE_HPP_INCLUDED
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// Copyright Beman Dawes 2006, 2007
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// Copyright Christoper Kohlhoff 2007
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// Copyright Peter Dimov 2017, 2018
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See library home page at http://www.boost.org/libs/system
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#include <boost/system/detail/error_category.hpp>
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#include <boost/system/detail/error_condition.hpp>
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#include <boost/system/detail/system_category.hpp>
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#include <boost/system/detail/enable_if.hpp>
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#include <boost/system/is_error_code_enum.hpp>
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#include <boost/system/detail/config.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/config.hpp>
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#include <ostream>
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namespace boost
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{
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namespace system
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{
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// class error_code
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// We want error_code to be a value type that can be copied without slicing
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// and without requiring heap allocation, but we also want it to have
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// polymorphic behavior based on the error category. This is achieved by
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// abstract base class error_category supplying the polymorphic behavior,
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// and error_code containing a pointer to an object of a type derived
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// from error_category.
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class error_code
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{
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private:
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int val_;
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bool failed_;
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const error_category * cat_;
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public:
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// constructors:
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BOOST_SYSTEM_CONSTEXPR error_code() BOOST_NOEXCEPT:
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val_( 0 ), failed_( false ), cat_( &system_category() )
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{
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}
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BOOST_SYSTEM_CONSTEXPR error_code( int val, const error_category & cat ) BOOST_NOEXCEPT:
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val_( val ), failed_( detail::failed_impl( val, cat ) ), cat_( &cat )
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{
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}
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template<class ErrorCodeEnum> BOOST_SYSTEM_CONSTEXPR error_code( ErrorCodeEnum e,
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typename detail::enable_if<is_error_code_enum<ErrorCodeEnum>::value>::type* = 0 ) BOOST_NOEXCEPT
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{
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*this = make_error_code( e );
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}
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// modifiers:
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BOOST_SYSTEM_CONSTEXPR void assign( int val, const error_category & cat ) BOOST_NOEXCEPT
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{
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val_ = val;
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failed_ = detail::failed_impl( val, cat );
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cat_ = &cat;
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}
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template<typename ErrorCodeEnum>
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BOOST_SYSTEM_CONSTEXPR typename detail::enable_if<is_error_code_enum<ErrorCodeEnum>::value, error_code>::type &
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operator=( ErrorCodeEnum val ) BOOST_NOEXCEPT
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{
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*this = make_error_code( val );
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return *this;
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}
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BOOST_SYSTEM_CONSTEXPR void clear() BOOST_NOEXCEPT
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{
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val_ = 0;
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failed_ = false;
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cat_ = &system_category();
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}
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// observers:
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BOOST_SYSTEM_CONSTEXPR int value() const BOOST_NOEXCEPT
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{
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return val_;
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}
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BOOST_SYSTEM_CONSTEXPR const error_category & category() const BOOST_NOEXCEPT
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{
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return *cat_;
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}
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error_condition default_error_condition() const BOOST_NOEXCEPT
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{
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return cat_->default_error_condition( value() );
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}
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std::string message() const
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{
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return cat_->message( value() );
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}
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char const * message( char * buffer, std::size_t len ) const BOOST_NOEXCEPT
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{
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return cat_->message( value(), buffer, len );
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}
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BOOST_SYSTEM_CONSTEXPR bool failed() const BOOST_NOEXCEPT
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{
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return failed_;
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}
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#if !defined(BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS)
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BOOST_SYSTEM_CONSTEXPR explicit operator bool() const BOOST_NOEXCEPT // true if error
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{
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return failed_;
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}
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#else
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typedef void (*unspecified_bool_type)();
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static void unspecified_bool_true() {}
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BOOST_SYSTEM_CONSTEXPR operator unspecified_bool_type() const BOOST_NOEXCEPT // true if error
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{
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return failed_? unspecified_bool_true: 0;
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}
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BOOST_SYSTEM_CONSTEXPR bool operator!() const BOOST_NOEXCEPT // true if no error
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{
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return !failed_;
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}
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#endif
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// relationals:
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// the more symmetrical non-member syntax allows enum
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// conversions work for both rhs and lhs.
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BOOST_SYSTEM_CONSTEXPR inline friend bool operator==( const error_code & lhs, const error_code & rhs ) BOOST_NOEXCEPT
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{
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return lhs.val_ == rhs.val_ && *lhs.cat_ == *rhs.cat_;
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}
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BOOST_SYSTEM_CONSTEXPR inline friend bool operator<( const error_code & lhs, const error_code & rhs ) BOOST_NOEXCEPT
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{
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return *lhs.cat_ < *rhs.cat_ || ( *lhs.cat_ == *rhs.cat_ && lhs.val_ < rhs.val_ );
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}
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#if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
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operator std::error_code () const
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{
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return std::error_code( value(), category() );
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}
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#endif
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};
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BOOST_SYSTEM_CONSTEXPR inline bool operator!=( const error_code & lhs, const error_code & rhs ) BOOST_NOEXCEPT
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{
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return !( lhs == rhs );
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}
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template<class Ch, class Tr>
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inline std::basic_ostream<Ch, Tr>&
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operator<< (std::basic_ostream<Ch, Tr>& os, error_code const & ec)
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{
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os << ec.category().name() << ':' << ec.value();
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return os;
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}
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inline std::size_t hash_value( error_code const & ec )
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{
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error_category const & cat = ec.category();
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boost::ulong_long_type id_ = cat.id_;
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if( id_ == 0 )
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{
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id_ = reinterpret_cast<boost::uintptr_t>( &cat );
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}
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boost::ulong_long_type hv = ( boost::ulong_long_type( 0xCBF29CE4 ) << 32 ) + 0x84222325;
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boost::ulong_long_type const prime = ( boost::ulong_long_type( 0x00000100 ) << 32 ) + 0x000001B3;
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// id
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hv ^= id_;
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hv *= prime;
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// value
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hv ^= static_cast<unsigned>( ec.value() );
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hv *= prime;
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return static_cast<std::size_t>( hv );
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}
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} // namespace system
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} // namespace boost
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#endif // #ifndef BOOST_SYSTEM_DETAIL_ERROR_CODE_HPP_INCLUDED
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