Question

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I am trying to do the same thing with a struct, but I have a problem with my sizeof operator, so in the integer case, I did this:

size_t totalMem = rows * sizeof(int *) + rows * cols * sizeof(int));

And in the struct case I did this:

size_t totalMem = (rows * sizeof(struct TEST *)) + (rows * cols * sizeof(struct TEST));

But I get the error: Invalid application of sizeof to incomplete type of struct TEST.

Any thoughts? Thanks.

Answer 1

Because you’re defining the struct as

 typedef struct { ... } TEST;

you should always refer to the struct as TEST, not struct TEST, i.e. use

 size_t totalMem = (rows * sizeof(TEST*)) + (rows * cols * sizeof(TEST));

To use struct TEST you need to actually name the struct, i.e.

 struct TEST { ... };

You can allow both with

 typedef struct TEST { ... } TEST;