variant.h

   1 #ifndef VARIANT_H
   2 #define VARIANT_H
   3
   4 #include <stdint.h>
   5 #include <stdbool.h>
   6
   7 #define strify_i(a) # a
   8 #define strify(a) strify_i(a)
   9
  10 #define typeis(lhs, rhs) \
  11     __builtin_types_compatible_p(lhs, rhs)
  12
  13 #define typename_check(lhs, rhs, name)  \
  14     if (typeis(lhs, rhs)) {             \
  15         v = strify(rhs);                \
  16     } else
  17
  18 typedef void (GenericEtter)(void);
  19
  20 typedef void (EtterTrampoline)(Plug *, const char *, GenericEtter *, Visitor *, Error **);
  21
  22
  23 #include "variants-gen.h"
  24
  25 #define setter_compatible(type, fn) \
  26     __builtin_types_compatible_p(typeof(fn), void (*)(Plug *, type))
  27
  28 #define getter_compatible(type, fn) \
  29     __builtin_types_compatible_p(typeof(fn), type (*)(Plug *))
  30
  31 #define BUILD_ASSERT(cond) do { (void)sizeof(int[!!(cond)-1]); } while (0)
  32
  33 #define plug_add_property(plug, name, type, getter, setter) do { \
  34     BUILD_ASSERT(getter_compatible(type, getter)); \
  35     BUILD_ASSERT(setter_compatible(type, setter)); \
  36     plug_add_property_full(plug, name, typename(type), plug_getter_lookup(typename(type)), plug_setter_lookup(typename(type))); \
  37     } while (0)
  38
  39 #endif