helpers.hpp
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/*
Copyright (c) 2014, Randolph Voorhies, Shane Grant
All rights reserved.
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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
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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
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*/
#ifndef CEREAL_DETAILS_HELPERS_HPP_
#define CEREAL_DETAILS_HELPERS_HPP_
#include <type_traits>
#include <cstdint>
#include <utility>
#include <memory>
#include <unordered_map>
#include <stdexcept>
#include "cereal/macros.hpp"
#include "cereal/details/static_object.hpp"
namespace cereal
{
// ######################################################################
struct Exception : public std::runtime_error
{
explicit Exception( const std::string & what_ ) : std::runtime_error(what_) {}
explicit Exception( const char * what_ ) : std::runtime_error(what_) {}
};
// ######################################################################
using size_type = CEREAL_SIZE_TYPE;
// forward decls
class BinaryOutputArchive;
class BinaryInputArchive;
// ######################################################################
namespace detail
{
struct NameValuePairCore {};
struct DeferredDataCore {};
}
// ######################################################################
template <class T>
class NameValuePair : detail::NameValuePairCore
{
private:
// If we get passed an array, keep the type as is, otherwise store
// a reference if we were passed an l value reference, else copy the value
using Type = typename std::conditional<std::is_array<typename std::remove_reference<T>::type>::value,
typename std::remove_cv<T>::type,
typename std::conditional<std::is_lvalue_reference<T>::value,
T,
typename std::decay<T>::type>::type>::type;
// prevent nested nvps
static_assert( !std::is_base_of<detail::NameValuePairCore, T>::value,
"Cannot pair a name to a NameValuePair" );
NameValuePair & operator=( NameValuePair const & ) = delete;
public:
NameValuePair( char const * n, T && v ) : name(n), value(std::forward<T>(v)) {}
char const * name;
Type value;
};
template<class Archive, class T> inline
typename
std::enable_if<std::is_same<Archive, ::cereal::BinaryInputArchive>::value ||
std::is_same<Archive, ::cereal::BinaryOutputArchive>::value,
T && >::type
make_nvp( const char *, T && value )
{
return std::forward<T>(value);
}
template<class Archive, class T> inline
typename
std::enable_if<!std::is_same<Archive, ::cereal::BinaryInputArchive>::value &&
!std::is_same<Archive, ::cereal::BinaryOutputArchive>::value,
NameValuePair<T> >::type
make_nvp( const char * name, T && value)
{
return {name, std::forward<T>(value)};
}
#define CEREAL_NVP_(name, value) ::cereal::make_nvp<Archive>(name, value)
// ######################################################################
template <class T>
struct BinaryData
{
using PT = typename std::conditional<std::is_const<typename std::remove_pointer<typename std::remove_reference<T>::type>::type>::value,
const void *,
void *>::type;
BinaryData( T && d, uint64_t s ) : data(std::forward<T>(d)), size(s) {}
PT data;
uint64_t size;
};
// ######################################################################
template <class T>
class DeferredData : detail::DeferredDataCore
{
private:
// If we get passed an array, keep the type as is, otherwise store
// a reference if we were passed an l value reference, else copy the value
using Type = typename std::conditional<std::is_array<typename std::remove_reference<T>::type>::value,
typename std::remove_cv<T>::type,
typename std::conditional<std::is_lvalue_reference<T>::value,
T,
typename std::decay<T>::type>::type>::type;
// prevent nested nvps
static_assert( !std::is_base_of<detail::DeferredDataCore, T>::value,
"Cannot defer DeferredData" );
DeferredData & operator=( DeferredData const & ) = delete;
public:
DeferredData( T && v ) : value(std::forward<T>(v)) {}
Type value;
};
// ######################################################################
namespace detail
{
// base classes for type checking
/* The rtti virtual function only exists to enable an archive to
be used in a polymorphic fashion, if necessary. See the
archive adapters for an example of this */
class OutputArchiveBase
{
public:
OutputArchiveBase() = default;
OutputArchiveBase( OutputArchiveBase && ) CEREAL_NOEXCEPT {}
OutputArchiveBase & operator=( OutputArchiveBase && ) CEREAL_NOEXCEPT { return *this; }
virtual ~OutputArchiveBase() CEREAL_NOEXCEPT = default;
private:
virtual void rtti() {}
};
class InputArchiveBase
{
public:
InputArchiveBase() = default;
InputArchiveBase( InputArchiveBase && ) CEREAL_NOEXCEPT {}
InputArchiveBase & operator=( InputArchiveBase && ) CEREAL_NOEXCEPT { return *this; }
virtual ~InputArchiveBase() CEREAL_NOEXCEPT = default;
private:
virtual void rtti() {}
};
// forward decls for polymorphic support
template <class Archive, class T> struct polymorphic_serialization_support;
struct adl_tag;
// used during saving pointers
static const uint32_t msb_32bit = 0x80000000;
static const int32_t msb2_32bit = 0x40000000;
}
// ######################################################################
template <class T>
class SizeTag
{
private:
// Store a reference if passed an lvalue reference, otherwise
// make a copy of the data
using Type = typename std::conditional<std::is_lvalue_reference<T>::value,
T,
typename std::decay<T>::type>::type;
SizeTag & operator=( SizeTag const & ) = delete;
public:
SizeTag( T && sz ) : size(std::forward<T>(sz)) {}
Type size;
};
// ######################################################################
template <class Key, class Value>
struct MapItem
{
using KeyType = typename std::conditional<
std::is_lvalue_reference<Key>::value,
Key,
typename std::decay<Key>::type>::type;
using ValueType = typename std::conditional<
std::is_lvalue_reference<Value>::value,
Value,
typename std::decay<Value>::type>::type;
MapItem( Key && key_, Value && value_ ) : key(std::forward<Key>(key_)), value(std::forward<Value>(value_)) {}
MapItem & operator=( MapItem const & ) = delete;
KeyType key;
ValueType value;
template <class Archive> inline
void CEREAL_SERIALIZE_FUNCTION_NAME(Archive & archive)
{
archive( make_nvp<Archive>("key", key),
make_nvp<Archive>("value", value) );
}
};
template <class KeyType, class ValueType> inline
MapItem<KeyType, ValueType> make_map_item(KeyType && key, ValueType && value)
{
return {std::forward<KeyType>(key), std::forward<ValueType>(value)};
}
namespace detail
{
namespace{ struct version_binding_tag {}; }
// ######################################################################
template <class T, class BindingTag = version_binding_tag> struct Version
{
static const std::uint32_t version = 0;
// we don't need to explicitly register these types since they
// always get a version number of 0
};
struct Versions
{
std::unordered_map<std::size_t, std::uint32_t> mapping;
std::uint32_t find( std::size_t hash, std::uint32_t version )
{
const auto result = mapping.emplace( hash, version );
return result.first->second;
}
}; // struct Versions
} // namespace detail
} // namespace cereal
#endif // CEREAL_DETAILS_HELPERS_HPP_
cereal::detail::Version
Version information class.
Definition: helpers.hpp:401
cereal::detail::OutputArchiveBase
Definition: helpers.hpp:269
cereal::DeferredData::DeferredData
DeferredData(T &&v)
Constructs a new NameValuePair.
Definition: helpers.hpp:257
cereal::BinaryOutputArchive
An output archive designed to save data in a compact binary representation.
Definition: binary.hpp:51
cereal::BinaryData::size
uint64_t size
size in bytes
Definition: helpers.hpp:222
cereal::NameValuePair::NameValuePair
NameValuePair(char const *n, T &&v)
Constructs a new NameValuePair.
Definition: helpers.hpp:165
cereal::detail::polymorphic_serialization_support
Definition: helpers.hpp:294
cereal::BinaryData::data
PT data
pointer to beginning of data
Definition: helpers.hpp:221
macros.hpp
Preprocessor macros that can customise the cereal library.
CEREAL_SIZE_TYPE
#define CEREAL_SIZE_TYPE
Determines the data type used for size_type.
Definition: macros.hpp:70
cereal::detail::DeferredDataCore
Definition: helpers.hpp:71
cereal::NameValuePair
For holding name value pairs.
Definition: helpers.hpp:139
cereal::BinaryInputArchive
An input archive designed to load data saved using BinaryOutputArchive.
Definition: binary.hpp:88
cereal::MapItem::MapItem
MapItem(Key &&key_, Value &&value_)
Construct a MapItem from a key and a value.
Definition: helpers.hpp:365
cereal::MapItem
A wrapper around a key and value for serializing data into maps.
Definition: helpers.hpp:351
cereal::detail::adl_tag
Definition: polymorphic_impl.hpp:696
cereal::BinaryData::PT
typename std::conditional< std::is_const< typename std::remove_pointer< typename std::remove_reference< T >::type >::type >::value, const void *, void * >::type PT
Definition: helpers.hpp:217
cereal::detail::NameValuePairCore
Definition: helpers.hpp:70
cereal::BinaryData
A wrapper around data that can be serialized in a binary fashion.
Definition: helpers.hpp:211
CEREAL_NOEXCEPT
#define CEREAL_NOEXCEPT
Defines the CEREAL_NOEXCEPT macro to use instead of noexcept.
Definition: macros.hpp:130
static_object.hpp
Internal polymorphism static object support.
cereal::MapItem::CEREAL_SERIALIZE_FUNCTION_NAME
void CEREAL_SERIALIZE_FUNCTION_NAME(Archive &archive)
Serialize the MapItem with the NVPs "key" and "value".
Definition: helpers.hpp:374
cereal::detail::Versions
Holds all registered version information.
Definition: helpers.hpp:409
cereal::SizeTag
A wrapper around size metadata.
Definition: helpers.hpp:312
cereal::Exception
An exception class thrown when things go wrong at runtime.
Definition: helpers.hpp:48
cereal::DeferredData
A wrapper around data that should be serialized after all non-deferred data.
Definition: helpers.hpp:232
cereal::detail::InputArchiveBase
Definition: helpers.hpp:281
cereal::NameValuePair::make_nvp
std::enable_if< std::is_same< Archive,::cereal::BinaryInputArchive >::value||std::is_same< Archive,::cereal::BinaryOutputArchive >::value, T && >::type make_nvp(const char *, T &&value)
A specialization of make_nvp<> that simply forwards the value for binary archives.
Definition: helpers.hpp:179
cereal::make_map_item
MapItem< KeyType, ValueType > make_map_item(KeyType &&key, ValueType &&value)
Create a MapItem so that human readable archives will group keys and values together.
Definition: helpers.hpp:385
cereal::size_type
CEREAL_SIZE_TYPE size_type
The size type used by cereal.
Definition: helpers.hpp:61
cereal::NameValuePair::make_nvp
std::enable_if<!std::is_same< Archive,::cereal::BinaryInputArchive >::value &&!std::is_same< Archive,::cereal::BinaryOutputArchive >::value, NameValuePair< T > >::type make_nvp(const char *name, T &&value)
A specialization of make_nvp<> that actually creates an nvp for non-binary archives.
Definition: helpers.hpp:192