FactoryMacros.h

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/*
 * FactoryMacros.h
 *
 *  Created on: 01 Aug 2017
 *      Author: Nicola Mori
 */

#ifndef FACTORYMACROS_H_
#define FACTORYMACROS_H_

#include "Factory.h"

#define GETOVERRIDE(_ignored, _1, _2, _3, _4, _5, NAME, ...) NAME

// Macro to convert a variadic argument list consisting of a list of types in a list of argument names
// E.g.  NAMEDARGS(float,int,char) -> float arg3, int arg2, char arg1
#define NAMEDARGS0()
#define NAMEDARGS1(type) type arg1
#define NAMEDARGS2(type, ...) type arg2, NAMEDARGS1(__VA_ARGS__)
#define NAMEDARGS3(type, ...) type arg3, NAMEDARGS2(__VA_ARGS__)
#define NAMEDARGS4(type, ...) type arg4, NAMEDARGS3(__VA_ARGS__)
#define NAMEDARGS5(type, ...) type arg5, NAMEDARGS4(__VA_ARGS__)
#define NAMEDARGS(...)                                                                                                 \
  GETOVERRIDE(ignored, ##__VA_ARGS__, NAMEDARGS5, NAMEDARGS4, NAMEDARGS3, NAMEDARGS2, NAMEDARGS1, NAMEDARGS0)          \
  (__VA_ARGS__)

// Macro to produce a list of variable names according to a list of types (one variable per type)
// E.g. ARGNAMES(float,int,char) -> arg3, arg2, arg1
#define ARGNAMES0()
#define ARGNAMES1(type) arg1
#define ARGNAMES2(type, ...) arg2, ARGNAMES1(__VA_ARGS__)
#define ARGNAMES3(type, ...) arg3, ARGNAMES2(__VA_ARGS__)
#define ARGNAMES4(type, ...) arg4, ARGNAMES3(__VA_ARGS__)
#define ARGNAMES5(type, ...) arg5, ARGNAMES4(__VA_ARGS__)
#define ARGNAMES(...)                                                                                                  \
  GETOVERRIDE(ignored, ##__VA_ARGS__, ARGNAMES5, ARGNAMES4, ARGNAMES3, ARGNAMES2, ARGNAMES1, ARGNAMES0)(__VA_ARGS__)

// Macro to produce a list of typenames to use in template definitions
// E.g. TYPENAMES(float,int,char) -> typename float, typename int, typename char
#define TYPENAMES0() typename T0
#define TYPENAMES1(type) typename T1, TYPENAMES0()
#define TYPENAMES2(type, ...) typename T2, TYPENAMES1(__VA_ARGS__)
#define TYPENAMES3(type, ...) typename T3, TYPENAMES2(__VA_ARGS__)
#define TYPENAMES4(type, ...) typename T4, TYPENAMES3(__VA_ARGS__)
#define TYPENAMES5(type, ...) typename T5, TYPENAMES4(__VA_ARGS__)
#define TYPENAMES(...)                                                                                                 \
  GETOVERRIDE(ignored, ##__VA_ARGS__, TYPENAMES5, TYPENAMES4, TYPENAMES3, TYPENAMES2, TYPENAMES1, TYPENAMES0)          \
  (__VA_ARGS__)

#define RegisterClassAsImp(counter, baseClassName, className, aliasName, ...)                                          \
  baseClassName *className##Builder_##counter(NAMEDARGS(__VA_ARGS__)) { return new className(ARGNAMES(__VA_ARGS__)); } \
  void className##Destroyer_##counter(className *p) { delete p; }                                                      \
  class className##Proxy_##counter {                                                                                   \
  public:                                                                                                              \
    className##Proxy_##counter() {                                                                                     \
      EA::Factory<baseClassName, ##__VA_ARGS__>::GetInstance().RegisterBuilder(aliasName,                              \
                                                                               className##Builder_##counter);          \
    }                                                                                                                  \
  };                                                                                                                   \
  className##Proxy_##counter proxyFor##className##_##counter

#define RegisterClassAsHelper(counter, baseClassName, className, aliasName, ...)                                       \
  RegisterClassAsImp(counter, baseClassName, className, aliasName, ##__VA_ARGS__)
#define RegisterClassAs(baseClassName, className, aliasName, ...)                                                      \
  RegisterClassAsHelper(__COUNTER__, baseClassName, className, aliasName, ##__VA_ARGS__)

#define RegisterClass(baseClassName, className, ...)                                                                   \
  RegisterClassAsHelper(__COUNTER__, baseClassName, className, #className, ##__VA_ARGS__)
#endif /* FACTORYMACROS_H_ */