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Asked: 2026-06-08T10:30:15+00:00

I have code that looks like the following: #include <stdio.h> typedef struct SomeStruct* ptr;

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I have code that looks like the following:

#include <stdio.h>
typedef struct SomeStruct* ptr;
main(){
  printf("%lu\n",sizeof(ptr));
}

The given code will print the size of struct SomeStruct*. However I want sizeof(struct SomeStruct). If I don’t know beforehand the name of the struct, is there a way for me to still find the size of the struct pointed to by ptr?

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1 Answer

  1. Editorial Team

    If you have a variable with type ptr, you can dereference it:

    ptr v;
sizeof(*v)
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