Practical C Programming

How to do it...

Follow these steps to create a compile-time assert expression that ensures that the user-defined structure is a specified number of bytes:

1. Define a structure with a few members:

struct customers { int orderid; char customer_name[20]; float amount; };

2. Define a compile-time assert that puts a constraint on the size of the structure. The program will compile only when the assert is validated, that is, the size of the structure is exactly equal to the bytes mentioned in the assert expression:

static_assert(sizeof(struct customers) == 28, "The structure is consuming unexpected number of bytes"); 

3. In the main body of the program, you can write any executable code. This code will compile and execute only when the assert expression ...