co_closure.h

/*
* Tencent is pleased to support the open source community by making Libco available.

* Copyright (C) 2014 THL A29 Limited, a Tencent company. 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 __CO_CLOSURE_H__
#define __CO_CLOSURE_H__
struct stCoClosure_t 
{
public:
	virtual void exec() = 0;
	virtual ~stCoClosure_t(){}
};

//1.base 
//-- 1.1 comac_argc

#define comac_get_args_cnt( ... ) comac_arg_n( __VA_ARGS__ )
#define comac_arg_n( _0,_1,_2,_3,_4,_5,_6,_7,N,...) N
#define comac_args_seqs() 7,6,5,4,3,2,1,0
#define comac_join_1( x,y ) x##y

#define comac_argc( ... ) comac_get_args_cnt( 0,##__VA_ARGS__,comac_args_seqs() )
#define comac_join( x,y) comac_join_1( x,y )

//-- 1.2 repeat
#define repeat_0( fun,a,... ) 
#define repeat_1( fun,a,... ) fun( 1,a,__VA_ARGS__ ) repeat_0( fun,__VA_ARGS__ )
#define repeat_2( fun,a,... ) fun( 2,a,__VA_ARGS__ ) repeat_1( fun,__VA_ARGS__ )
#define repeat_3( fun,a,... ) fun( 3,a,__VA_ARGS__ ) repeat_2( fun,__VA_ARGS__ )
#define repeat_4( fun,a,... ) fun( 4,a,__VA_ARGS__ ) repeat_3( fun,__VA_ARGS__ )
#define repeat_5( fun,a,... ) fun( 5,a,__VA_ARGS__ ) repeat_4( fun,__VA_ARGS__ )
#define repeat_6( fun,a,... ) fun( 6,a,__VA_ARGS__ ) repeat_5( fun,__VA_ARGS__ )

#define repeat( n,fun,... ) comac_join( repeat_,n )( fun,__VA_ARGS__)

//2.implement
#if __cplusplus <= 199711L
#define decl_typeof( i,a,... ) typedef typeof( a ) typeof_##a;
#else
#define decl_typeof( i,a,... ) typedef decltype( a ) typeof_##a;
#endif
#define impl_typeof( i,a,... ) typeof_##a & a;
#define impl_typeof_cpy( i,a,... ) typeof_##a a;
#define con_param_typeof( i,a,... ) typeof_##a & a##r,
#define param_init_typeof( i,a,... ) a(a##r),


//2.1 reference

#define co_ref( name,... )\
repeat( comac_argc(__VA_ARGS__) ,decl_typeof,__VA_ARGS__ )\
class type_##name\
{\
public:\
	repeat( comac_argc(__VA_ARGS__) ,impl_typeof,__VA_ARGS__ )\
	int _member_cnt;\
	type_##name( \
		repeat( comac_argc(__VA_ARGS__),con_param_typeof,__VA_ARGS__ ) ... ): \
		repeat( comac_argc(__VA_ARGS__),param_init_typeof,__VA_ARGS__ ) _member_cnt(comac_argc(__VA_ARGS__)) \
	{}\
} name( __VA_ARGS__ ) ;


//2.2 function

#define co_func(name,...)\
repeat( comac_argc(__VA_ARGS__) ,decl_typeof,__VA_ARGS__ )\
class name:public stCoClosure_t\
{\
public:\
	repeat( comac_argc(__VA_ARGS__) ,impl_typeof_cpy,__VA_ARGS__ )\
	int _member_cnt;\
public:\
	name( repeat( comac_argc(__VA_ARGS__),con_param_typeof,__VA_ARGS__ ) ... ): \
		repeat( comac_argc(__VA_ARGS__),param_init_typeof,__VA_ARGS__ ) _member_cnt(comac_argc(__VA_ARGS__))\
	{}\
	void exec()

#define co_func_end }


#endif