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#pragma once
/* Example:
int multiplier = 5;
DECL_LAMBDA(l, int, (int a), {
return a * multiplier;
})
assert(l.func(l.arg, 4) == 20);
The point of this is to work on both iOS, where GCC inline
functions don't work, and Linux, where Apple blocks generally
aren't available.
*/
#ifdef __BLOCKS__
struct _blk {
void *isa;
int flags;
int reserved;
void *invoke;
};
#define LAMBDA_BODY(typ, ret, args, body) \
({ union { \
ret (^blk) args; \
struct _blk *_blk; \
void *vp; \
} u = { ^ret args body }; \
(typ) {u._blk->invoke, u.vp}; \
})
#else
#define LAMBDA_BODY_(typ, ret, args, body) \
({ ret func args body; \
(typ) {&func, 0}; \
})
#define LAMBDA_BODY(typ, ret, args, body) \
LAMBDA_BODY_(typ, ret, LAMBDA_UNPAREN args, body)
#endif
#define LAMBDA_UNPAREN(args...) (void *_lambda_ignored, ##args)
#define DECL_LAMBDA(name, ret, args, body) \
struct { \
ret (*func) LAMBDA_UNPAREN args; \
void *arg; \
} name = LAMBDA_BODY(typeof(name), ret, args, body);
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