dunnart/idnumber.d at master · pwil3058/dunnart · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
// idnumber.d
//
// Copyright Peter Williams 2013 <[email protected]>.
//
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

module idnumber;

mixin template IdNumber(T) {
    const T id;

    override hash_t toHash()
    {
        return id;
    }

    override bool opEquals(Object o)
    {
        return id == (cast(typeof(this)) o).id;
    }

    override int opCmp(Object o)
    {
        return id - (cast(typeof(this)) o).id;
    }
}

mixin template UniqueId(T) {
    mixin IdNumber!(T);
    protected static T next_id;

    const string set_unique_id = "id = next_id++;";
}