sizeof single struct member in C

Question

I am trying to declare a struct that is dependent upon another struct. I want to use sizeof to be safe/pedantic.

typedef struct _parent
{
  floa         


        

Answer 1

You are free to use FIELD_SIZEOF(t, f) in the Linux kernel. It's just defined as following:

#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))

This type of macro is mentioned in other answers. But it's more portable to use an already-defined macro.