ocean.core.array.DefaultPredicates source code

1 /*******************************************************************************
2 
3     Implementation of default predicate function objects used by algorithms
4     in `ocean.core.array` package.
5 
6     Based on `tango.core.Array` module from Tango library.
7 
8     Copyright:
9         Copyright (C) 2005-2006 Sean Kelly.
10         Some parts copyright (c) 2009-2016 dunnhumby Germany GmbH.
11         All rights reserved.
12     
13     License:
14         Tango Dual License: 3-Clause BSD License / Academic Free License v3.0.
15         See LICENSE_TANGO.txt for details.
16 
17 *******************************************************************************/
18 
19 module ocean.core.array.DefaultPredicates;
20 
21 version (UnitTest)
22 {
23     import ocean.core.Test;
24     import ocean.transition;
25 }
26 
27 struct DefaultPredicates
28 {
29     struct IsEqual ( T )
30     {
31         static bool opCall( in T p1, in T p2 )
32         {
33             // FIXME_IN_D2: avoid forcing const methods on objects
34             auto _p1 = cast(T) p1;
35             auto _p2 = cast(T) p2;
36 
37             return !!(_p1 == _p2);
38         }
39     }
40 
41 
42     struct IsLess ( T )
43     {
44         static bool opCall( in T p1, in T p2 )
45         {
46             // FIXME_IN_D2: avoid forcing const methods on objects
47             auto _p1 = cast(T) p1;
48             auto _p2 = cast(T) p2;
49             return _p1 < _p2;
50         }
51     }
52 }
53 
54 // Test to enforce that IsEqual work with both
55 // value and reference types
56 unittest
57 {
58     class C
59     {
60         int x;
61 
62         mixin (genOpEquals(
63         `{
64             auto o = cast(typeof(this)) rhs;
65             if (o is null) return false;
66             return (this.x == o.x);
67         }`));
68     }
69 
70     struct S
71     {
72         int x;
73 
74         mixin (genOpEquals("
75         {
76             return this.x == rhs.x;
77         }
78         "));
79     }
80 
81     auto c1 = new C;
82     auto c2 = new C;
83     S s1, s2;
84 
85     auto r1 = DefaultPredicates.IsEqual!(C)(c1, c2);
86     auto r2 = DefaultPredicates.IsEqual!(S)(s1, s2);
87 
88     test!("==")(r1, true);
89     test!("==")(r2, true);
90 }