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#ifndef UINTPTR_MAX
#error must include stdint.h first
#endif
#if UINTPTR_MAX == 0xffffffff
#define UPB_SIZE(size32, size64) size32
#else
#define UPB_SIZE(size32, size64) size64
#endif
#define UPB_FIELD_AT(msg, fieldtype, offset) \
*(fieldtype*)((const char*)(msg) + offset)
#define UPB_READ_ONEOF(msg, fieldtype, offset, case_offset, case_val, default) \
UPB_FIELD_AT(msg, int, case_offset) == case_val \
? UPB_FIELD_AT(msg, fieldtype, offset) \
: default
#define UPB_WRITE_ONEOF(msg, fieldtype, offset, value, case_offset, case_val) \
UPB_FIELD_AT(msg, int, case_offset) = case_val; \
UPB_FIELD_AT(msg, fieldtype, offset) = value;
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