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xpack.h
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xpack.h
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/*
* Copyright (C) 2021 Duowan Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __X_PACK_H
#define __X_PACK_H
#include "extend.h"
#include "l1l2_expand.h"
#include "traits.h"
/*
work with X_PACK_N to expand macro
struct MyX {
int a;
std::string b;
double c;
XPACK(A(a,"_id"), O(b,c));
};
macro expand order:
XPACK(A(a,"_id"), O(b,c))
--> X_PACK_N(X_PACK_L1, X_PACK_L1_DECODE, , A(a, "_id"), O(b,c))
--> X_PACK_L1_2(X_PACK_L1_DECODE, A(a, "_id"), O(b,c))
--> X_PACK_L1_DECODE(A(a, "_id")) X_PACK_L1_DECODE(O(b,c))
--> X_PACK_L1_DECODE_A(a, "_id") X_PACK_L1_DECODE_O(b,c)
--> X_PACK_ACT_DECODE_A(a, "_id") X_PACK_N2(X_PACK_L2, X_PACK_ACT_DECODE_O, b, c) // https://gcc.gnu.org/onlinedocs/cpp/Self-Referential-Macros.html so we need define X_PACK_N2. if use X_PACK_N preprocessor will treat is as Self-Referential-Macros
--> X_PACK_ACT_DECODE_A(a, "_id") X_PACK_L2_2(X_PACK_ACT_DECODE_O, b, c)
--> X_PACK_ACT_DECODE_A(a, "_id") X_PACK_ACT_DECODE_O(b) X_PACK_ACT_DECODE_O(c)
--> // expand to convert code
*/
// flag only work for this member
#define X_EXPAND_FLAG_F(...) int __x_pack_flag = 0 X_PACK_N2(X_PACK_L2, X_PACK_ACT_FLAG, 0, __VA_ARGS__) ;
#define X_PACK_ACT_FLAG(ARG, F) | X_PACK_FLAG_##F
/*
X(F(x,y,z), member1, member2, ....)
O same as X(F(0), member1, member2, ...)
M same as X(F(M), member1, member2, ...)
A Alias. A(member1, alias1, member2, alias2, ...)
AF Alias with Flag. A(F(x,y,z), member1, alias1, member2, alias2 ...)
I Inherit
B bitfield
*/
/////////////////////////// XPACK /////////////////////////////
//=======DECODE
#define X_PACK_L1_DECODE(x) { X_PACK_L1_DECODE_##x }
//----
#define X_PACK_L1_DECODE_X(FLAG, ...) X_EXPAND_FLAG_##FLAG xpack::Extend __x_pack_ext(__x_pack_flag, NULL); X_PACK_N2(X_PACK_L2, X_PACK_DECODE_ACT_O, 0, __VA_ARGS__)
#define X_PACK_L1_DECODE_E(FLAG, ...) X_EXPAND_FLAG_##FLAG xpack::Extend __x_pack_ext(__x_pack_flag, NULL); X_PACK_N2(X_PACK_L2, X_PACK_DECODE_ACT_E, 0, __VA_ARGS__)
#define X_PACK_L1_DECODE_B(FLAG, ...) X_EXPAND_FLAG_##FLAG xpack::Extend __x_pack_ext(__x_pack_flag, NULL); X_PACK_N2(X_PACK_L2, X_PACK_DECODE_ACT_B, 0, __VA_ARGS__)
#define X_PACK_L1_DECODE_AF(FLAG, ...) X_EXPAND_FLAG_##FLAG X_PACK_N2(X_PACK_L2_2, X_PACK_DECODE_ACT_A, 0, __VA_ARGS__) // extend define in ACTION
//-----customer decoder---------
#define X_PACK_L1_DECODE_C(CUSTOM, FLAG, ...) X_EXPAND_FLAG_##FLAG xpack::Extend __x_pack_ext(__x_pack_flag, NULL); X_PACK_N2(X_PACK_L2, X_PACK_DECODE_ACT_C, CUSTOM, __VA_ARGS__)
#define X_PACK_L1_DECODE_O(...) X_PACK_L1_DECODE_X(F(0), __VA_ARGS__)
#define X_PACK_L1_DECODE_M(...) X_PACK_L1_DECODE_X(F(M), __VA_ARGS__)
#define X_PACK_L1_DECODE_A(...) X_PACK_L1_DECODE_AF(F(0), __VA_ARGS__)
#define X_PACK_L1_DECODE_I(...) X_PACK_N2(X_PACK_L2, X_PACK_DECODE_ACT_I, 0, __VA_ARGS__)
//=======ENCODE
#define X_PACK_L1_ENCODE(x) { X_PACK_L1_ENCODE_##x }
//-----
#define X_PACK_L1_ENCODE_X(FLAG, ...) X_EXPAND_FLAG_##FLAG xpack::Extend __x_pack_ext(__x_pack_flag, NULL); X_PACK_N2(X_PACK_L2, X_PACK_ENCODE_ACT_O, 0, __VA_ARGS__)
#define X_PACK_L1_ENCODE_E(FLAG, ...) X_EXPAND_FLAG_##FLAG xpack::Extend __x_pack_ext(__x_pack_flag, NULL); X_PACK_N2(X_PACK_L2, X_PACK_ENCODE_ACT_E, 0, __VA_ARGS__)
#define X_PACK_L1_ENCODE_B(FLAG, ...) X_EXPAND_FLAG_##FLAG xpack::Extend __x_pack_ext(__x_pack_flag, NULL); X_PACK_N2(X_PACK_L2, X_PACK_ENCODE_ACT_B, 0, __VA_ARGS__)
#define X_PACK_L1_ENCODE_AF(FLAG, ...) X_EXPAND_FLAG_##FLAG X_PACK_N2(X_PACK_L2_2, X_PACK_ENCODE_ACT_A, 0, __VA_ARGS__) // extend define in ACTION
#define X_PACK_L1_ENCODE_C(CUSTOM, FLAG, ...) X_EXPAND_FLAG_##FLAG xpack::Extend __x_pack_ext(__x_pack_flag, NULL); X_PACK_N2(X_PACK_L2, X_PACK_ENCODE_ACT_C, CUSTOM, __VA_ARGS__)
#define X_PACK_L1_ENCODE_O(...) X_PACK_L1_ENCODE_X(F(0), __VA_ARGS__)
#define X_PACK_L1_ENCODE_M(...) X_PACK_L1_ENCODE_X(F(M), __VA_ARGS__)
#define X_PACK_L1_ENCODE_A(...) X_PACK_L1_ENCODE_AF(F(0), __VA_ARGS__)
//-----
#define X_PACK_L1_ENCODE_I(...) X_PACK_N2(X_PACK_L2, X_PACK_ENCODE_ACT_I, 0, __VA_ARGS__)
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ decode act ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#define X_PACK_DECODE_ACT_O(ARG, M) \
__x_pack_ret |= __x_pack_obj.decode(#M, __x_pack_self.M, &__x_pack_ext);
#define X_PACK_DECODE_ACT_C(CUSTOM, M) \
__x_pack_ret |= CUSTOM##_decode(__x_pack_obj, __x_pack_self, #M, __x_pack_self.M, &__x_pack_ext);
// enum for not support c++11
#ifndef X_PACK_SUPPORT_CXX0X
#define X_PACK_DECODE_ACT_E(ARG, M) \
__x_pack_ret |= __x_pack_obj.decode(#M, *((int*)&__x_pack_self.M), &__x_pack_ext);
#else
#define X_PACK_DECODE_ACT_E X_PACK_DECODE_ACT_O
#endif
#define X_PACK_DECODE_ACT_A(ARG, M, NAME) \
{ \
static xpack::Alias __x_pack_alias(#M, NAME); \
xpack::Extend __x_pack_ext(__x_pack_flag, &__x_pack_alias); \
const char *__new_name = __x_pack_alias.Name(__x_pack_obj.Name());\
__x_pack_ret |= __x_pack_obj.decode(__new_name, __x_pack_self.M, &__x_pack_ext); \
}
// Inheritance B::__x_pack_decode(__x_pack_obj)
#define X_PACK_DECODE_ACT_I(ARG, P) \
{ \
xpack::Extend __x_pack_tmp_ext(0,NULL); __x_pack_tmp_ext.ctrl_flag |= X_PACK_CTRL_FLAG_INHERIT;\
__x_pack_ret |= __x_pack_obj.decode(static_cast<P&>(__x_pack_self), &__x_pack_tmp_ext); \
}
// bitfield, not support alias
#define X_PACK_DECODE_ACT_B(ARG, B) \
{ \
x_pack_decltype(__x_pack_self.B) __x_pack_tmp = 0; \
__x_pack_ret |= __x_pack_obj.decode(#B, __x_pack_tmp, &__x_pack_ext); \
__x_pack_self.B = __x_pack_tmp;\
}
// ~~~~~~~~~~~~~~~~~~~~~~~ encode act ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#define X_PACK_ENCODE_ACT_O(ARG, M) \
__x_pack_ret |= __x_pack_obj.encode(#M, __x_pack_self.M, &__x_pack_ext);
#define X_PACK_ENCODE_ACT_C(CUSTOM, M) \
__x_pack_ret |= CUSTOM##_encode(__x_pack_obj, __x_pack_self, #M, __x_pack_self.M, &__x_pack_ext);
#ifndef X_PACK_SUPPORT_CXX0X
#define X_PACK_ENCODE_ACT_E(ARG, M) \
__x_pack_ret |= __x_pack_obj.encode(#M, (const int&)__x_pack_self.M, &__x_pack_ext);
#else
#define X_PACK_ENCODE_ACT_E X_PACK_ENCODE_ACT_O
#endif
#define X_PACK_ENCODE_ACT_A(ARG, M, NAME) \
{ \
static xpack::Alias __x_pack_alias(#M, NAME); \
xpack::Extend __x_pack_ext(__x_pack_flag, &__x_pack_alias); \
const char *__new_name = __x_pack_alias.Name(__x_pack_obj.Name());\
__x_pack_ret |= __x_pack_obj.encode(__new_name, __x_pack_self.M, &__x_pack_ext); \
}
#define X_PACK_ENCODE_ACT_B(ARG, M) \
__x_pack_obj.encode(#M, __x_pack_self.M, &__x_pack_ext);
#define X_PACK_ENCODE_ACT_I(ARG, P) \
{ \
xpack::Extend __x_pack_tmp_ext(0,NULL); __x_pack_tmp_ext.ctrl_flag |= X_PACK_CTRL_FLAG_INHERIT;\
__x_pack_ret |= __x_pack_obj.encode(NULL, static_cast<const P&>(__x_pack_self), &__x_pack_tmp_ext); \
}
// for mark defined XPACK
#define X_PACK_COMMON \
public: \
static bool const __x_pack_value = true;
// decode function
#define X_PACK_DECODE_BEGIN \
template<class __X_PACK_DOC, class __X_PACK_ME> \
bool __x_pack_decode(__X_PACK_DOC& __x_pack_obj, __X_PACK_ME &__x_pack_self, const xpack::Extend *__x_pack_extp) {(void)__x_pack_extp; bool __x_pack_ret = false;
// encode function
#define X_PACK_ENCODE_BEGIN \
template <class __X_PACK_DOC, class __X_PACK_ME> \
bool __x_pack_encode(__X_PACK_DOC& __x_pack_obj, const __X_PACK_ME &__x_pack_self, const xpack::Extend *__x_pack_extp) const {(void)__x_pack_extp; bool __x_pack_ret = false;
// out decode function
#define X_PACK_DECODE_BEGIN_OUT(NAME) \
template<typename __X_PACK_DOC> \
bool __x_pack_decode_out(__X_PACK_DOC& __x_pack_obj, NAME & __x_pack_self, const xpack::Extend *__x_pack_extp) {(void)__x_pack_extp; bool __x_pack_ret = false;
// out encode function
#define X_PACK_ENCODE_BEGIN_OUT(NAME) \
template <class __X_PACK_DOC> \
bool __x_pack_encode_out(__X_PACK_DOC& __x_pack_obj, const NAME &__x_pack_self, const xpack::Extend *__x_pack_extp) {(void)__x_pack_extp; bool __x_pack_ret = false;
#define XPACK(...) \
X_PACK_COMMON \
X_PACK_DECODE_BEGIN X_PACK_N(X_PACK_L1, X_PACK_L1_DECODE, __VA_ARGS__) return __x_pack_ret; } \
X_PACK_ENCODE_BEGIN X_PACK_N(X_PACK_L1, X_PACK_L1_ENCODE, __VA_ARGS__) return __x_pack_ret; }
#define XPACK_OUT(NAME, ...) \
namespace xpack { \
template<> struct is_xpack_out<NAME> {static bool const value = true;}; \
X_PACK_DECODE_BEGIN_OUT(NAME) X_PACK_N(X_PACK_L1, X_PACK_L1_DECODE, __VA_ARGS__) return __x_pack_ret; } \
X_PACK_ENCODE_BEGIN_OUT(NAME) X_PACK_N(X_PACK_L1, X_PACK_L1_ENCODE, __VA_ARGS__) return __x_pack_ret; } \
}
#endif