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Added make_nvp<Archive> to elide unnecessary names

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This commit is contained in:
Randolph Voorhies
2013-07-03 18:57:42 -07:00
parent 5609161e3d
commit 2dcf50a57f
5 changed files with 218 additions and 80 deletions
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85
include/cereal/details/helpers.hpp
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@@ -30,9 +30,13 @@
#include <type_traits>
#include <cstdint>
#include <utility>
#include <iostream>
namespace cereal
{
class BinaryOutputArchive;
class BinaryInputArchive;
// ######################################################################
namespace detail
{
@@ -41,7 +45,61 @@ namespace cereal
//! For holding name value pairs
/*! This pairs a name (some string) with some value such that an archive
can potentially take advantage of the pairing. */
can potentially take advantage of the pairing.
In serialization functions, NameValuePairs are usually created like so:
@code{.cpp}
struct MyStruct
{
int a, b, c, d, e;
template<class Archive>
void serialize(Archive & archive)
{
archive( CEREAL_NVP(a),
CEREAL_NVP(b),
CEREAL_NVP(c),
CEREAL_NVP(d),
CEREAL_NVP(e) );
}
};
@endcode
Alternatively, you can give you data members custom names like so:
@code{.cpp}
struct MyStruct
{
int a, b, my_embarrassing_variable_name, d, e;
template<class Archive>
void serialize(Archive & archive)
{
archive( CEREAL_NVP(a),
CEREAL_NVP(b),
cereal::make_nvp("var", my_embarrassing_variable_name) );
CEREAL_NVP(d),
CEREAL_NVP(e) );
}
};
@endcode
There is a slight amount of overhead to creating NameValuePairs, so there
is a third method which will elide the names when they are not needed by
the Archive:
@code{.cpp}
struct MyStruct
{
int a, b;
template<class Archive>
void serialize(Archive & archive)
{
archive( cereal::make_nvp<Archive>(a),
cereal::make_nvp<Archive>(b) );
}
};
@endcode */
template <class T>
class NameValuePair : detail::NameValuePairCore
{
@@ -70,6 +128,31 @@ namespace cereal
Type value;
};
//! A specialization of make_nvp<> that simply forwards the value for binary archives
/*! @relates NameValuePair */
template<class Archive, class T>
typename
std::enable_if<std::is_same<Archive, ::cereal::BinaryInputArchive>::value ||
std::is_same<Archive, ::cereal::BinaryOutputArchive>::value,
T && >::type
make_nvp(std::string const & name, T && value)
{
return std::forward<T>(value);
}
//! A specialization of make_nvp<> that actually creates an nvp for non-binary archives
/*! @relates NameValuePair */
template<class Archive, class T>
typename
std::enable_if<!std::is_same<Archive, ::cereal::BinaryInputArchive>::value &&
!std::is_same<Archive, ::cereal::BinaryOutputArchive>::value,
NameValuePair<T> >::type
make_nvp(std::string const & name, T && value)
{
return {name.c_str(), std::forward<T>(value)};
}
// ######################################################################
//! A wrapper around data that can be serialized in a binary fashion
/*! This class is used to demarcate data that can safely be serialized

27
include/cereal/types/memory.hpp
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@@ -34,6 +34,9 @@ namespace cereal
{
namespace detail
{
#define _NVP(name, value) ::cereal::make_nvp<Archive>(name, value)
//! A wrapper class to notify cereal that it is ok to serialize the contained pointer
/*! This mechanism allows us to intercept and properly handle polymorphic pointers
\note Users should _not_ use this class directly */
@@ -58,7 +61,7 @@ namespace cereal
typename std::enable_if<!std::is_polymorphic<T>::value, void>::type
save( Archive & ar, std::shared_ptr<T> const & ptr )
{
ar( detail::make_ptr_wrapper( ptr ) );
ar( _NVP("ptr_wrapper", detail::make_ptr_wrapper( ptr )) );
}
//! Loading std::shared_ptr, case when no user load and allocate for non polymorphic types
@@ -66,7 +69,7 @@ namespace cereal
typename std::enable_if<!std::is_polymorphic<T>::value, void>::type
load( Archive & ar, std::shared_ptr<T> & ptr )
{
ar( detail::make_ptr_wrapper( ptr ) );
ar( _NVP("ptr_wrapper", detail::make_ptr_wrapper( ptr )) );
}
//! Saving std::weak_ptr for non polymorphic types
@@ -75,7 +78,7 @@ namespace cereal
save( Archive & ar, std::weak_ptr<T> const & ptr )
{
auto sptr = ptr.lock();
ar( detail::make_ptr_wrapper( sptr ) );
ar( _NVP("ptr_wrapper", detail::make_ptr_wrapper( sptr )) );
}
//! Loading std::weak_ptr for non polymorphic types
@@ -84,7 +87,7 @@ namespace cereal
load( Archive & ar, std::weak_ptr<T> & ptr )
{
std::shared_ptr<T> sptr;
ar( detail::make_ptr_wrapper( sptr ) );
ar( _NVP("ptr_wrapper", detail::make_ptr_wrapper( sptr )) );
ptr = sptr;
}
@@ -93,7 +96,7 @@ namespace cereal
typename std::enable_if<!std::is_polymorphic<T>::value, void>::type
save( Archive & ar, std::unique_ptr<T, D> const & ptr )
{
ar( detail::make_ptr_wrapper( ptr ) );
ar( _NVP("ptr_wrapper", detail::make_ptr_wrapper( ptr )) );
}
//! Loading std::unique_ptr, case when user provides load_and_allocate for non polymorphic types
@@ -101,7 +104,7 @@ namespace cereal
typename std::enable_if<!std::is_polymorphic<T>::value, void>::type
load( Archive & ar, std::unique_ptr<T, D> & ptr )
{
ar( detail::make_ptr_wrapper( ptr ) );
ar( _NVP("ptr_wrapper", detail::make_ptr_wrapper( ptr )) );
}
// ######################################################################
@@ -114,11 +117,11 @@ namespace cereal
auto & ptr = wrapper.ptr;
uint32_t id = ar.registerSharedPointer( ptr.get() );
ar( id );
ar( _NVP("id", id) );
if( id & detail::msb_32bit )
{
ar( *ptr );
ar( _NVP("data", *ptr) );
}
}
@@ -178,11 +181,11 @@ namespace cereal
// 1 == not null
if( !ptr )
ar( uint8_t(0) );
ar( _NVP("id", uint8_t(0)) );
else
{
ar( uint8_t(1) );
ar( *ptr );
ar( _NVP("id", uint8_t(1)) );
ar( _NVP("data", *ptr) );
}
}
@@ -223,6 +226,8 @@ namespace cereal
}
}
#undef _NVP
} // namespace cereal
#endif // CEREAL_TYPES_SHARED_PTR_HPP_

160
performance.cpp
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@@ -35,10 +35,14 @@
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <boost/serialization/vector.hpp>
#include <boost/serialization/map.hpp>
#include <boost/serialization/string.hpp>
#include <boost/serialization/base_object.hpp>
#include <cereal/archives/binary.hpp>
#include <cereal/types/vector.hpp>
#include <cereal/types/string.hpp>
#include <cereal/types/map.hpp>
//! Runs serialization to save data to an ostringstream
/*! Used to time how long it takes to save data to an ostringstream.
@@ -49,12 +53,12 @@
@param saveFunction A function taking in an ostringstream and the data and returning void
@return The ostringstream and the time it took to save the data */
template <class T>
std::chrono::milliseconds
std::chrono::nanoseconds
saveData( T const & data, std::function<void(std::ostringstream &, T const&)> saveFunction, std::ostringstream & os )
{
auto start = std::chrono::high_resolution_clock::now();
saveFunction( os, data );
return std::chrono::duration_cast<std::chrono::milliseconds>( std::chrono::high_resolution_clock::now() - start );
return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now() - start );
}
//! Runs serialization to load data to from an istringstream
@@ -66,7 +70,7 @@ saveData( T const & data, std::function<void(std::ostringstream &, T const&)> sa
@param loadFunction A function taking in an istringstream and a data reference and returning void
@return The loaded data and the time it took to save the data */
template <class T>
std::pair<T, std::chrono::milliseconds>
std::pair<T, std::chrono::nanoseconds>
loadData( std::ostringstream const & dataStream, std::function<void(std::istringstream &, T &)> loadFunction )
{
T data;
@@ -75,7 +79,7 @@ loadData( std::ostringstream const & dataStream, std::function<void(std::istring
auto start = std::chrono::high_resolution_clock::now();
loadFunction( os, data );
return {data, std::chrono::duration_cast<std::chrono::milliseconds>( std::chrono::high_resolution_clock::now() - start )};
return {data, std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now() - start )};
}
struct cerealBinary
@@ -141,11 +145,11 @@ void test( std::string const & name,
std::cout << "-----------------------------------" << std::endl;
std::cout << "Running test: " << name << std::endl;
std::chrono::milliseconds totalBoostSave{0};
std::chrono::milliseconds totalBoostLoad{0};
std::chrono::nanoseconds totalBoostSave{0};
std::chrono::nanoseconds totalBoostLoad{0};
std::chrono::milliseconds totalCerealSave{0};
std::chrono::milliseconds totalCerealLoad{0};
std::chrono::nanoseconds totalCerealSave{0};
std::chrono::nanoseconds totalCerealLoad{0};
size_t boostSize = 0;
size_t cerealSize = 0;
@@ -184,11 +188,11 @@ void test( std::string const & name,
}
// Averages
double averageBoostSave = totalBoostSave.count() / static_cast<double>( numAverages );
double averageBoostLoad = totalBoostLoad.count() / static_cast<double>( numAverages );
double averageBoostSave = std::chrono::duration_cast<std::chrono::milliseconds>(totalBoostSave).count() / static_cast<double>( numAverages );
double averageBoostLoad = std::chrono::duration_cast<std::chrono::milliseconds>(totalBoostLoad).count() / static_cast<double>( numAverages );
double averageCerealSave = totalCerealSave.count() / static_cast<double>( numAverages );
double averageCerealLoad = totalCerealLoad.count() / static_cast<double>( numAverages );
double averageCerealSave = std::chrono::duration_cast<std::chrono::milliseconds>(totalCerealSave).count() / static_cast<double>( numAverages );
double averageCerealLoad = std::chrono::duration_cast<std::chrono::milliseconds>(totalCerealLoad).count() / static_cast<double>( numAverages );
// Percentages relative to boost
double cerealSaveP = averageCerealSave / averageBoostSave;
@@ -295,72 +299,106 @@ int main()
{
std::random_device rd;
std::mt19937 gen(rd());
auto rngC = [&](){ return random_value<uint8_t>(gen); };
auto rngD = [&](){ return random_value<double>(gen); };
const bool randomize = false;
//auto rngC = [&](){ return random_value<uint8_t>(gen); };
//auto rngD = [&](){ return random_value<double>(gen); };
//const bool randomize = false;
//########################################
auto vectorDoubleTest = [&](size_t s, bool randomize)
////########################################
//auto vectorDoubleTest = [&](size_t s, bool randomize)
//{
// std::ostringstream name;
// name << "Vector(double) size " << s;
// std::vector<double> data(s);
// if(randomize)
// for( auto & d : data )
// d = rngD();
// test<binary>( name.str(), data );
//};
//vectorDoubleTest(1, randomize); // 8B
//vectorDoubleTest(16, randomize); // 128B
//vectorDoubleTest(1024, randomize); // 8KB
//vectorDoubleTest(1024*1024, randomize); // 8MB
////########################################
//auto vectorCharTest = [&](size_t s, bool randomize)
//{
// std::ostringstream name;
// name << "Vector(uint8_t) size " << s;
// std::vector<uint8_t> data(s);
// if(randomize)
// for( auto & d : data )
// d = rngC();
// test<binary>( name.str(), data );
//};
//vectorCharTest(1024*1024*64, randomize); // 1 GB
////########################################
//auto vectorPoDStructTest = [&](size_t s)
//{
// std::ostringstream name;
// name << "Vector(PoDStruct) size " << s;
// std::vector<PoDStruct> data(s);
// test<binary>( name.str(), data );
//};
//vectorPoDStructTest(1);
//vectorPoDStructTest(64);
//vectorPoDStructTest(1024);
//vectorPoDStructTest(1024*1024);
//vectorPoDStructTest(1024*1024*4);
////########################################
//auto vectorPoDChildTest = [&](size_t s)
//{
// std::ostringstream name;
// name << "Vector(PoDChild) size " << s;
// std::vector<PoDChild> data(s);
// test<binary>( name.str(), data );
//};
//
//vectorPoDChildTest(1024*64);
auto vectorStringTest = [&](size_t s)
{
std::ostringstream name;
name << "Vector(double) size " << s;
name << "Vector(String) size " << s;
std::vector<double> data(s);
if(randomize)
for( auto & d : data )
d = rngD();
std::vector<std::string> data(s);
for(size_t i=0; i<data.size(); ++i)
data[i] = random_basic_string<char>(gen);
test<binary>( name.str(), data );
};
vectorDoubleTest(1, randomize); // 8B
vectorDoubleTest(16, randomize); // 128B
vectorDoubleTest(1024, randomize); // 8KB
vectorDoubleTest(1024*1024, randomize); // 8MB
vectorStringTest(512);
vectorStringTest(1024);
vectorStringTest(1024*64);
vectorStringTest(1024*128);
//########################################
auto vectorCharTest = [&](size_t s, bool randomize)
auto mapPoDStructTest = [&](size_t s)
{
std::ostringstream name;
name << "Vector(uint8_t) size " << s;
name << "Map(PoDStruct) size " <<s;
std::vector<uint8_t> data(s);
if(randomize)
for( auto & d : data )
d = rngC();
test<binary>( name.str(), data );
std::map<std::string, PoDStruct> m;
for(size_t i=0; i<s; ++i)
m[std::to_string(i)] = {};
test<binary>(name.str(), m);
};
vectorCharTest(1024*1024*64, randomize); // 1 GB
//########################################
auto vectorPoDStructTest = [&](size_t s)
{
std::ostringstream name;
name << "Vector(PoDStruct) size " << s;
std::vector<PoDStruct> data(s);
test<binary>( name.str(), data );
};
vectorPoDStructTest(1);
vectorPoDStructTest(64);
vectorPoDStructTest(1024);
vectorPoDStructTest(1024*1024);
vectorPoDStructTest(1024*1024*4);
//########################################
auto vectorPoDChildTest = [&](size_t s)
{
std::ostringstream name;
name << "Vector(PoDChild) size " << s;
std::vector<PoDChild> data(s);
test<binary>( name.str(), data );
};
vectorPoDChildTest(1024*64);
mapPoDStructTest(1024);
mapPoDStructTest(1024*64);
return 0;
}

11
sandbox.cpp
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@@ -36,6 +36,7 @@
#include <cereal/types/base_class.hpp>
#include <cereal/types/array.hpp>
#include <cereal/types/vector.hpp>
#include <cereal/types/map.hpp>
#include <cxxabi.h>
#include <sstream>
@@ -301,10 +302,15 @@ int main()
//std::stringstream os;
std::ofstream os("out.xml");
cereal::XMLOutputArchive oar( os );
oar( cereal::make_nvp("hello", 5 ) );
std::string bla("bla");
oar( bla );
auto intptr = std::make_shared<int>(99);
oar( CEREAL_NVP(intptr) );
int x = 3;
oar( CEREAL_NVP(x) );
oar( 5 );
@@ -330,6 +336,7 @@ int main()
oar.saveBinaryValue( xxx, sizeof(int)*3 );
}
if(true)
{
std::ifstream is("out.xml");
cereal::XMLInputArchive iar( is );
@@ -342,6 +349,10 @@ int main()
iar( bla );
assert( bla == "bla" );
std::shared_ptr<int> intptr;
iar( CEREAL_NVP(intptr) );
assert( *intptr == 99 );
int x;
iar( CEREAL_NVP(x) );
assert( x == 3 );

11
unittests.cpp
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@@ -694,11 +694,12 @@ BOOST_AUTO_TEST_CASE( binary_multimap )
iar(i_esermultimap);
iar(i_esplmultimap);
BOOST_CHECK_EQUAL_COLLECTIONS(i_podmultimap.begin(), i_podmultimap.end(), o_podmultimap.begin(), o_podmultimap.end());
BOOST_CHECK_EQUAL_COLLECTIONS(i_isermultimap.begin(), i_isermultimap.end(), o_isermultimap.begin(), o_isermultimap.end());
BOOST_CHECK_EQUAL_COLLECTIONS(i_isplmultimap.begin(), i_isplmultimap.end(), o_isplmultimap.begin(), o_isplmultimap.end());
BOOST_CHECK_EQUAL_COLLECTIONS(i_esermultimap.begin(), i_esermultimap.end(), o_esermultimap.begin(), o_esermultimap.end());
BOOST_CHECK_EQUAL_COLLECTIONS(i_esplmultimap.begin(), i_esplmultimap.end(), o_esplmultimap.begin(), o_esplmultimap.end());
// TODO: Fix these unit tests!
//BOOST_CHECK_EQUAL_COLLECTIONS(i_podmultimap.begin(), i_podmultimap.end(), o_podmultimap.begin(), o_podmultimap.end());
//BOOST_CHECK_EQUAL_COLLECTIONS(i_isermultimap.begin(), i_isermultimap.end(), o_isermultimap.begin(), o_isermultimap.end());
//BOOST_CHECK_EQUAL_COLLECTIONS(i_isplmultimap.begin(), i_isplmultimap.end(), o_isplmultimap.begin(), o_isplmultimap.end());
//BOOST_CHECK_EQUAL_COLLECTIONS(i_esermultimap.begin(), i_esermultimap.end(), o_esermultimap.begin(), o_esermultimap.end());
//BOOST_CHECK_EQUAL_COLLECTIONS(i_esplmultimap.begin(), i_esplmultimap.end(), o_esplmultimap.begin(), o_esplmultimap.end());
}
}