IntrusivePtr.store

static struct Foo{
    ControlBlock!(int, int) c;
    int i;

    this(int i)pure nothrow @safe @nogc{
        this.i = i;
    }
}

//null store:
{
    shared x = IntrusivePtr!(shared Foo).make(123);
    assert(x.load.get.i == 123);

    x.store(null);
    assert(x.useCount == 0);
    assert(x.load == null);
}

//rvalue store:
{
    shared x = IntrusivePtr!(shared Foo).make(123);
    assert(x.load.get.i == 123);

    x.store(IntrusivePtr!(shared Foo).make(42));
    assert(x.load.get.i == 42);
}

//lvalue store:
{
    shared x = IntrusivePtr!(shared Foo).make(123);
    auto y = IntrusivePtr!(shared Foo).make(42);

    assert(x.load.get.i == 123);
    assert(y.load.get.i == 42);

    x.store(y);
    assert(x.load.get.i == 42);
    assert(x.useCount == 2);
}