id_sys 0.1.0

Provides data structures which can be marked such that they only work with similarly marked integer data types.
Documentation 
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use crate::{soa::UsizeIdStruct, tests::util::MTest, usize_id};

#[test]
fn new_test() {
    let id_struct = UsizeIdStruct::<MTest>::new();

    let actual = id_struct.count();
    let expected = 0;
    assert_eq!(actual, expected);
}

#[test]
fn count_test() {
    let mut id_struct = UsizeIdStruct::<MTest>::new();

    let actual = id_struct.count();
    let expected = 0;
    assert_eq!(actual, expected);

    let id_0 = id_struct.retain();
    let id_1 = id_struct.retain();

    let actual = id_struct.count();
    let expected = 2;
    assert_eq!(actual, expected);

    id_struct.release(id_0);

    let actual = id_struct.count();
    let expected = 1;
    assert_eq!(actual, expected);

    id_struct.release(id_1);

    let actual = id_struct.count();
    let expected = 0;
    assert_eq!(actual, expected);
}

#[test]
fn retain_release_test() {
    let mut id_struct = UsizeIdStruct::<MTest>::new();

    let id_0 = id_struct.retain();

    let actual = id_0;
    let expected = usize_id!(MTest; 0);
    assert_eq!(actual, expected);

    let id_1 = id_struct.retain();

    let actual = id_1;
    let expected = usize_id!(MTest; 1);
    assert_eq!(actual, expected);

    id_struct.release(id_0);

    let actual = id_struct.retain();
    let expected = usize_id!(MTest; 0);
    assert_eq!(actual, expected);

    id_struct.release(id_0);
    id_struct.release(id_1);

    let actual = id_struct.retain();
    let expected = usize_id!(MTest; 1);
    assert_eq!(actual, expected);

    let actual = id_struct.retain();
    let expected = usize_id!(MTest; 0);
    assert_eq!(actual, expected);
}

#[test]
fn into_iter_test() {
    let mut id_struct = UsizeIdStruct::<MTest>::new();

    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![];
    assert_eq!(actual, expected);

    let id_0 = id_struct.retain();
    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_0];
    assert_eq!(actual, expected);

    let id_1 = id_struct.retain();
    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_0, id_1];
    assert_eq!(actual, expected);

    let id_2 = id_struct.retain();
    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_0, id_1, id_2];
    assert_eq!(actual, expected);

    id_struct.release(id_0);
    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_1, id_2];
    assert_eq!(actual, expected);

    id_struct.retain();
    id_struct.release(id_1);

    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_0, id_2];
    assert_eq!(actual, expected);

    id_struct.retain();
    id_struct.release(id_2);

    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_0, id_1];
    assert_eq!(actual, expected);

    id_struct.retain();
    id_struct.release(id_0);
    id_struct.release(id_1);

    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_2];
    assert_eq!(actual, expected);

    id_struct.retain();
    id_struct.retain();
    id_struct.release(id_1);
    id_struct.release(id_2);

    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_0];
    assert_eq!(actual, expected);

    id_struct.retain();
    id_struct.retain();
    id_struct.release(id_0);
    id_struct.release(id_2);

    let actual: Vec<_> = id_struct.into_iter().collect();
    let expected = vec![id_1];
    assert_eq!(actual, expected);
}