Mixed C/C ++ source: Get sizeof(C++ struct) in C code

Question

In this project, I need to get the size of a struct in a header file from within a C file.

I can't include the header file in the C file because the struct contains classes which will not compile in C.

Any ideas?

Answer 1

You could declare in the .h file:

extern const size_t SIZE_OF_MY_STRUCT;

And define SIZE_OF_MY_STRUCT in the .cpp file as:

extern const size_t SIZE_OF_MY_STRUCT = sizeof(MyStruct);

So you would not have the overhead of a function call.