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#ifndef MACRO_H
#define MACRO_H
/*
* NOTE This file uses __VA_OPT__. This is not standard compliant.
*/
/*
* Token paste
*/
#define TP(a, b) a ## b
#define TP3(a, b, c) a ## b ## c
#define TP4(a, b, c, d) a ## b ## c ## d
/*
* Get length of __VA_ARGS__
* Borrowed fram:
* https://stackoverflow.com/a/35986932
*/
#define VA_ARGS_NUM_PRIV(P1, P2, P3, P4, P5, P6, Pn, ...) Pn
#define VA_ARGS_NUM(...) VA_ARGS_NUM_PRIV(-1, ## __VA_ARGS__, 5, 4, 3, 2, 1, 0)
#define NEW_HELPER(T, ARG_COUNT) \
TP3(T, _init_, ARG_COUNT)
/*
* Constructor type name
*/
#define CONSTRUCTOR_T(T, C) TP3(T, _init_, C)
#define CONSTRUCTOR_GEN(parent, child, C) \
CONSTRUCTOR_T(parent ## _ ## child, C)
/*
* Returns full type of constructor
*/
#define CONSTRUCTOR_DECL(T, ...) \
CONSTRUCTOR_T(T, VA_ARGS_NUM(__VA_ARGS__)) (T* this __VA_OPT__(,) __VA_ARGS__)
/*
* Call the constructor of an object
*/
#define CONSTRUCT(T, N, ...) \
CONSTRUCTOR_T(T, VA_ARGS_NUM(__VA_ARGS__)) (N __VA_OPT__(,) __VA_ARGS__)
/*
* Allocate a new object on the HEAP
*/
#define NEW(T, N, ...) \
T* N = malloc(sizeof(*N)); \
CONSTRUCT(T, N, __VA_ARGS__);
/*
* Allocate a new object on the STACK
*/
#define SNEW(T, N, ...) \
T N; \
CONSTRUCT(T, & N, __VA_ARGS__);
#endif /* MACRO_H */
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