|
0
|
1 /**
|
|
|
2 * Copyright: Copyright (c) 2010 Jacob Carlborg.
|
|
|
3 * Authors: Jacob Carlborg
|
|
|
4 * Version: Initial created: Jan 29, 2010
|
|
|
5 * License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0)
|
|
|
6 */
|
|
|
7 module orange.util.Use;
|
|
|
8
|
|
|
9 import mambo.io;
|
|
|
10
|
|
|
11 version (Tango)
|
|
|
12 {
|
|
|
13 import tango.core.Tuple;
|
|
|
14 import tango.core.Traits;
|
|
|
15 }
|
|
|
16
|
|
|
17 else
|
|
|
18 {
|
|
|
19 import std.typetuple;
|
|
|
20 import std.traits;
|
|
|
21
|
|
|
22 alias ReturnType ReturnTypeOf;
|
|
|
23 alias ParameterTypeTuple ParameterTupleOf;
|
|
|
24 }
|
|
|
25
|
|
|
26 struct OpInStruct (ARGS...)
|
|
|
27 {
|
|
|
28 static assert (ARGS.length > 0);
|
|
|
29
|
|
|
30 private
|
|
|
31 {
|
|
|
32 alias ReturnTypeOf!(ARGS[0]) ReturnType;
|
|
|
33
|
|
|
34 static if (ARGS.length >= 2)
|
|
|
35 alias Tuple!(ReturnType delegate (ARGS), ARGS[1 .. $]) NEW_ARGS;
|
|
|
36
|
|
|
37 else
|
|
|
38 alias Tuple!(ReturnType delegate (ARGS)) NEW_ARGS;
|
|
|
39 }
|
|
|
40
|
|
|
41 NEW_ARGS args;
|
|
|
42
|
|
|
43 ReturnType opIn (ARGS[0] dg)
|
|
|
44 {
|
|
|
45 assert(args[0]);
|
|
|
46
|
|
|
47 static if (NEW_ARGS.length == 1)
|
|
|
48 return args[0](dg);
|
|
|
49
|
|
|
50 else
|
|
|
51 return args[0](dg, args[1 .. $]);
|
|
|
52 }
|
|
|
53 }
|
|
|
54
|
|
|
55 struct RestoreStruct (U, T)
|
|
|
56 {
|
|
|
57 U delegate(U delegate (), ref T) dg;
|
|
|
58 T* value;
|
|
|
59
|
|
|
60 U opIn (U delegate () deleg)
|
|
|
61 {
|
|
|
62 return dg(deleg, *value);
|
|
|
63 }
|
|
|
64 }
|
|
|
65 RestoreStruct!(U, T) restore (U = void, T) (ref T val)
|
|
|
66 {
|
|
|
67 RestoreStruct!(U, T) restoreStruct;
|
|
|
68
|
|
|
69 restoreStruct.dg = (U delegate () dg, ref T value){
|
|
|
70 T t = value;
|
|
|
71
|
|
|
72 static if (is(U == void))
|
|
|
73 {
|
|
|
74 dg();
|
|
|
75 value = t;
|
|
|
76 }
|
|
|
77
|
|
|
78 else
|
|
|
79 {
|
|
|
80 auto result = dg();
|
|
|
81 value = t;
|
|
|
82
|
|
|
83 return result;
|
|
|
84 }
|
|
|
85 };
|
|
|
86
|
|
|
87 restoreStruct.value = &val;
|
|
|
88
|
|
|
89 return restoreStruct;
|
|
|
90 } |
