cloudfoundry-community/bosh-cloudstack-cpi

package main

// Tests of field promotion logic.

type A struct {
    x int
    y *int
}

type B struct {
    p int
    q *int
}

type C struct {
    A
    *B
}

type D struct {
    a int
    C
}

func assert(cond bool) {
    if !cond {
        panic("failed")
    }
}

func f1(c C) {
    assert(c.x == c.A.x)
    assert(c.y == c.A.y)
    assert(&c.x == &c.A.x)
    assert(&c.y == &c.A.y)

    assert(c.p == c.B.p)
    assert(c.q == c.B.q)
    assert(&c.p == &c.B.p)
    assert(&c.q == &c.B.q)

    c.x = 1
    *c.y = 1
    c.p = 1
    *c.q = 1
}

func f2(c *C) {
    assert(c.x == c.A.x)
    assert(c.y == c.A.y)
    assert(&c.x == &c.A.x)
    assert(&c.y == &c.A.y)

    assert(c.p == c.B.p)
    assert(c.q == c.B.q)
    assert(&c.p == &c.B.p)
    assert(&c.q == &c.B.q)

    c.x = 1
    *c.y = 1
    c.p = 1
    *c.q = 1
}

func f3(d D) {
    assert(d.x == d.C.A.x)
    assert(d.y == d.C.A.y)
    assert(&d.x == &d.C.A.x)
    assert(&d.y == &d.C.A.y)

    assert(d.p == d.C.B.p)
    assert(d.q == d.C.B.q)
    assert(&d.p == &d.C.B.p)
    assert(&d.q == &d.C.B.q)

    d.x = 1
    *d.y = 1
    d.p = 1
    *d.q = 1
}

func f4(d *D) {
    assert(d.x == d.C.A.x)
    assert(d.y == d.C.A.y)
    assert(&d.x == &d.C.A.x)
    assert(&d.y == &d.C.A.y)

    assert(d.p == d.C.B.p)
    assert(d.q == d.C.B.q)
    assert(&d.p == &d.C.B.p)
    assert(&d.q == &d.C.B.q)

    d.x = 1
    *d.y = 1
    d.p = 1
    *d.q = 1
}

func main() {
    y := 123
    c := C{
        A{x: 42, y: &y},
        &B{p: 42, q: &y},
    }

    assert(&c.x == &c.A.x)

    f1(c)
    f2(&c)

    d := D{C: c}
    f3(d)
    f4(&d)
}