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serialize.h
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serialize.h
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#pragma once
#include <list>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "logging.h"
#include "streambuffer.h"
namespace remmy {
#if (defined _WIN32) || (__GNUC__ >= 5)
template<typename T>
struct TriviallyCopyable {
static const bool value = std::is_trivially_copyable<T>::value;
};
#else
template<typename T>
struct TriviallyCopyable {
static const bool value = std::has_trivial_copy_constructor<T>::value;
};
#endif
#define HAS_MEM_FUNC(func, name) \
template<typename T, typename Sign> \
struct name { \
typedef char yes[1]; \
typedef char no [2]; \
template <typename U, U> struct type_check; \
template <typename _1> static yes &chk(type_check<Sign, &_1::func > *); \
template <typename > static no &chk(...); \
static bool const value = sizeof(chk<T>(0)) == sizeof(yes); \
}
HAS_MEM_FUNC(Serialize, _has_serialize_);
HAS_MEM_FUNC(Deserialize, _has_deserialize_);
template<typename T, bool isClass = std::is_class<T>::value>
struct _has_serialize {
const static bool value =
(_has_serialize_<T, void(T::*)(StreamBuffer&)const>::value ||
_has_serialize_<T, void(T::*)(StreamBuffer&)>::value) &&
_has_deserialize_<T, void(T::*)(StreamBuffer&)>::value;
};
template<typename T>
struct _has_serialize<T, false> {
const static bool value = false;
};
#define ENABLE_IF_HAS_SERIALIZE(T, RT) typename std::enable_if<_has_serialize<T>::value, RT>::type
template<typename T>
struct _should_do_memcpy {
const static bool value = TriviallyCopyable<T>::value
&& !std::is_pointer<T>::value
&& !_has_serialize<T>::value;
};
template<typename T>
class Serializer {
public:
/*
* If T has Serialize and Deserialize, then use them
*/
template<typename T2 = T>
static typename std::enable_if<_has_serialize<T2>::value, void>::type
Serialize(StreamBuffer& buf, const T2& d) {
d.Serialize(buf);
}
template<typename T2 = T>
static typename std::enable_if<_has_serialize<T2>::value, void>::type
Deserialize(StreamBuffer& buf, T2& d) {
d.Deserialize(buf);
}
/*
* Otherwise, use memcpy if applicable
*/
template<typename T2 = T>
static typename std::enable_if<_should_do_memcpy<T2>::value, void>::type
Serialize(StreamBuffer & buf, const T2 & val) {
buf.Write(&val, sizeof(T));
}
template<typename T2 = T>
static typename std::enable_if<_should_do_memcpy<T2>::value, void>::type
Deserialize(StreamBuffer & buf, T2 & val) {
buf.Read(&val, sizeof(T));
}
template <bool v, typename T_>
struct _AssertValue
{
static_assert(v, "Assertion failed <see below for more information>");
static bool const value = v;
};
/*
* Else, raise an error
*/
template<typename T2 = T>
static typename std::enable_if<!_has_serialize<T2>::value && !_should_do_memcpy<T2>::value, void>::type
Serialize(StreamBuffer & buf, const T2 & val) {
static_assert(_AssertValue<false, T2>::value,
"Serialize not defined for this type. You can define it by:\n"
" 1. define void Serialize(Streambuf&, const T&), or\n"
" 2. define T::Serialize(Streambuf&), or\n"
" 3. define Serializer<T>::Serialize(StreamBuf&, const T&)");
}
template<typename T2 = T>
static typename std::enable_if<!_has_serialize<T2>::value && !_should_do_memcpy<T2>::value, void>::type
Deserialize(StreamBuffer & buf, T2 & val) {
static_assert(_AssertValue<false, T2>::value,
"Deserialize not defined for this type. You can define it by:\n"
" 1. define void Deserialize(Streambuf&, T&), or\n"
" 2. define T::Deserialize(Streambuf&), or\n"
" 3. define Serializer<T>::Deserialize(StreamBuf&, T&)");
}
};
// partial specialization for pair
template<typename T1, typename T2>
class Serializer <std::pair<T1, T2>> {
public:
static void Serialize(StreamBuffer & buf, const std::pair<T1, T2> & val) {
Serializer<T1>::Serialize(buf, val.first);
Serializer<T2>::Serialize(buf, val.second);
}
static void Deserialize(StreamBuffer & buf, std::pair<T1, T2> & val) {
Serializer<T1>::Deserialize(buf, val.first);
Serializer<T2>::Deserialize(buf, val.second);
}
};
template<typename T>
inline void Serialize(StreamBuffer & buf, const T & val) {
Serializer<T>::Serialize(buf, val);
}
template<class T>
inline void Deserialize(StreamBuffer & buf, T & val) {
Serializer<T>::Deserialize(buf, val);
}
// ------------------------------
// specially for vector
// If T is not trivially copyable, we must copy them one-by-one
// If T is trivially copyable, we copy the whole vector at once
template<typename ContainerT, typename T,
bool ONE_BY_ONE = true>
class ContainerSerializer {
public:
static void Serialize(StreamBuffer& buf, const ContainerT& vec) {
size_t size = vec.size();
buf.Write(&size, sizeof(size));
for (auto & iter : vec) {
remmy::Serialize(buf, iter);
}
}
static void Deserialize(StreamBuffer& buf, ContainerT& vec) {
size_t size;
buf.Read(&size, sizeof(size));
vec.resize(size);
for (auto & iter : vec) {
remmy::Deserialize(buf, iter);
}
}
};
template<typename ContainerT, typename T>
class ContainerSerializer <ContainerT, T, false> {
public:
static void Serialize(StreamBuffer& buf, const ContainerT& vec) {
size_t size = vec.size();
buf.Write(&size, sizeof(size));
if (!vec.empty()) {
buf.Write(&vec[0], sizeof(T)*vec.size());
}
}
static void Deserialize(StreamBuffer& buf, ContainerT& vec) {
size_t size;
buf.Read(&size, sizeof(size));
vec.resize(size);
if (!vec.empty()) {
buf.Read(&vec[0], sizeof(T)*size);
}
}
};
template<typename T>
class Serializer<std::vector<T>>
: public ContainerSerializer<std::vector<T>, T, !_should_do_memcpy<T>::value> {};
template<>
class Serializer<std::string>
: public ContainerSerializer<std::string, char, false> {};
template<typename T>
class Serializer<std::deque<T>>
: public ContainerSerializer<std::deque<T>, T, true> {};
template<typename T>
class Serializer<std::list<T>>
: public ContainerSerializer<std::list<T>, T, true> {};
template<typename T>
class Serializer<std::set<T>> : public ContainerSerializer<std::set<T>, T, true> {};
template<typename T>
class Serializer<std::unordered_set<T>> : public ContainerSerializer<std::unordered_set<T>, T, true> {};
template<typename K, typename V>
class Serializer<std::map<K, V>> : public ContainerSerializer<std::map<K, V>, std::pair<K, V>, true> {};
template<typename K, typename V>
class Serializer<std::unordered_map<K, V>> : public ContainerSerializer<std::unordered_map<K, V>, std::pair<K, V>, true> {};
template<typename T>
inline void SerializeVariadic(StreamBuffer& buf, const T& d) {
Serialize(buf, d);
}
template<typename T, typename... Ts>
inline void SerializeVariadic(StreamBuffer& buf, const T& d, const Ts&... dd) {
Serialize(buf, d);
SerializeVariadic(buf, dd...);
}
namespace _detail {
template<typename Tup, size_t N>
struct TupleDeserializer {
static inline void Apply(StreamBuffer& buf, Tup& tup) {
auto& e = std::get<std::tuple_size<Tup>::value - N>(tup);
Deserialize(buf, e);
TupleDeserializer<Tup, N - 1>::Apply(buf, tup);
}
};
template<typename Tup>
struct TupleDeserializer<Tup, 0> {
static inline void Apply(StreamBuffer&, Tup&) {}
};
template<typename Tup, size_t N>
struct TupleSerializer {
static inline void Apply(StreamBuffer& buf, const Tup& tup) {
auto& e = std::get<std::tuple_size<Tup>::value - N>(tup);
Serialize(buf, e);
TupleSerializer<Tup, N - 1>::Apply(buf, tup);
}
};
template<typename Tup>
struct TupleSerializer<Tup, 0> {
static inline void Apply(StreamBuffer& buf, const Tup& tup) {}
};
}
template<typename... Ts>
inline void DeserializeVariadic(StreamBuffer& buf, std::tuple<Ts...>& tup) {
using Tup = std::tuple<Ts...>;
_detail::TupleDeserializer<Tup, std::tuple_size<Tup>::value>::Apply(buf, tup);
}
template<typename... Ts>
inline void Serialize(StreamBuffer& buf, const std::tuple<Ts...>& tup) {
return _detail::TupleSerializer<std::tuple<Ts...>,
std::tuple_size<std::tuple<Ts...>>::value>::Apply(buf, tup);
}
template<typename... Ts>
inline void Deserialize(StreamBuffer& buf, std::tuple<Ts...>& tup) {
return _detail::TupleDeserializer<std::tuple<Ts...>,
std::tuple_size<std::tuple<Ts...>>::value>::Apply(buf, tup);
}
}