Macro assert_size 

macro_rules! assert_size {
    ($t:ty, $size:expr) => { ... };
}

Asserts that the size of a type is equal to a given value.

Examples

use assert_size::assert_size;

assert_size!((), 0); // 0 bytes
assert_size!(bool, 1); // 1 byte
assert_size!([u8; 3], 3); // 3 bytes