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/*! \file bitset.hpp
\brief Support for types found in \<bitset\>
\ingroup STLSupport */
/*
Copyright (c) 2014, Randolph Voorhies, Shane Grant
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CEREAL_TYPES_BITSET_HPP_
#define CEREAL_TYPES_BITSET_HPP_
#include "cereal/cereal.hpp"
#include "cereal/types/string.hpp"
#include <bitset>
namespace cereal
{
namespace bitset_detail
{
//! The type the bitset is encoded with
/*! @internal */
enum class type : uint8_t
{
ulong,
ullong,
string,
bits
};
}
//! Serializing (save) for std::bitset when BinaryData optimization supported
template <class Archive, size_t N,
traits::EnableIf<traits::is_output_serializable<BinaryData<std::uint32_t>, Archive>::value>
= traits::sfinae> inline
void CEREAL_SAVE_FUNCTION_NAME( Archive & ar, std::bitset<N> const & bits )
{
ar( CEREAL_NVP_("type", bitset_detail::type::bits) );
// Serialize 8 bit chunks
std::uint8_t chunk = 0;
std::uint8_t mask = 0x80;
// Set each chunk using a rotating mask for the current bit
for( std::size_t i = 0; i < N; ++i )
{
if( bits[i] )
chunk |= mask;
mask = static_cast<std::uint8_t>(mask >> 1);
// output current chunk when mask is empty (8 bits)
if( mask == 0 )
{
ar( chunk );
chunk = 0;
mask = 0x80;
}
}
// serialize remainder, if it exists
if( mask != 0x80 )
ar( chunk );
}
//! Serializing (save) for std::bitset when BinaryData is not supported
template <class Archive, size_t N,
traits::DisableIf<traits::is_output_serializable<BinaryData<std::uint32_t>, Archive>::value>
= traits::sfinae> inline
void CEREAL_SAVE_FUNCTION_NAME( Archive & ar, std::bitset<N> const & bits )
{
try
{
auto const b = bits.to_ulong();
ar( CEREAL_NVP_("type", bitset_detail::type::ulong) );
ar( CEREAL_NVP_("data", b) );
}
catch( std::overflow_error const & )
{
try
{
auto const b = bits.to_ullong();
ar( CEREAL_NVP_("type", bitset_detail::type::ullong) );
ar( CEREAL_NVP_("data", b) );
}
catch( std::overflow_error const & )
{
ar( CEREAL_NVP_("type", bitset_detail::type::string) );
ar( CEREAL_NVP_("data", bits.to_string()) );
}
}
}
//! Serializing (load) for std::bitset
template <class Archive, size_t N> inline
void CEREAL_LOAD_FUNCTION_NAME( Archive & ar, std::bitset<N> & bits )
{
bitset_detail::type t;
ar( CEREAL_NVP_("type", t) );
switch( t )
{
case bitset_detail::type::ulong:
{
unsigned long b;
ar( CEREAL_NVP_("data", b) );
bits = std::bitset<N>( b );
break;
}
case bitset_detail::type::ullong:
{
unsigned long long b;
ar( CEREAL_NVP_("data", b) );
bits = std::bitset<N>( b );
break;
}
case bitset_detail::type::string:
{
std::string b;
ar( CEREAL_NVP_("data", b) );
bits = std::bitset<N>( b );
break;
}
case bitset_detail::type::bits:
{
// Normally we would use BinaryData to route this at compile time,
// but doing this at runtime doesn't break any old serialization
std::uint8_t chunk = 0;
std::uint8_t mask = 0;
bits.reset();
// Load one chunk at a time, rotating through the chunk
// to set bits in the bitset
for( std::size_t i = 0; i < N; ++i )
{
if( mask == 0 )
{
ar( chunk );
mask = 0x80;
}
if( chunk & mask )
bits[i] = 1;
mask = static_cast<std::uint8_t>(mask >> 1);
}
break;
}
default:
throw Exception("Invalid bitset data representation");
}
}
} // namespace cereal
#endif // CEREAL_TYPES_BITSET_HPP_
|
