util.typeinfo source code

1 /*
2 Permission is hereby granted, free of charge, to any person obtaining a copy of
3 this software and associated documentation files (the "Software"), to deal in
4 the Software without restriction, including without limitation the rights to
5 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
6 of the Software, and to permit persons to whom the Software is furnished to do
7 so, subject to the following conditions:
8 
9 The above copyright notice and this permission notice shall be included in all
10 copies or substantial portions of the Software.
11 
12 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
15 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
16 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
17 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
18 SOFTWARE.
19 */
20 module util.typeinfo;
21 
22 import std.traits;
23 
24 enum Constness {
25     Mutable,
26     Const,
27     Immutable,
28     Wildcard
29 }
30 
31 string constness_ToString(Constness c) {
32     switch(c){
33         case Constness.Mutable:
34             return "mutable";
35         case Constness.Const:
36             return "const";
37         case Constness.Immutable:
38             return "immutable";
39         case Constness.Wildcard:
40             return "inout";
41         default:
42             assert(0);
43     }
44 }
45 
46 template constness(T) {
47     static if(is(T == immutable)) {
48         enum constness = Constness.Immutable;
49     }else static if(is(T == const)) {
50         enum constness = Constness.Const;
51     }else static if(is(T == inout)) {
52         enum constness = Constness.Wildcard;
53     }else {
54         enum constness = Constness.Mutable;
55     }
56 }
57 
58 bool constCompatible(Constness c1, Constness c2) {
59     return c1 == c2 || 
60         c1 == Constness.Const && c2 != Constness.Wildcard ||
61         c2 == Constness.Const && c1 != Constness.Wildcard;
62 }
63 
64 template ApplyConstness(T, Constness constness) {
65     alias Unqual!T Tu;
66     static if(constness == Constness.Mutable) {
67         alias Tu ApplyConstness;
68     }else static if(constness == Constness.Const) {
69         alias const(Tu) ApplyConstness;
70     }else static if(constness == Constness.Wildcard) {
71         alias inout(Tu) ApplyConstness;
72     }else static if(constness == Constness.Immutable) {
73         alias immutable(Tu) ApplyConstness;
74     }else {
75         static assert(0);
76     }
77 }
78 
79 template ApplyConstness2(T, Constness constness) {
80     alias Unqual!T Tu;
81     static if(constness == Constness.Mutable) {
82         alias Tu ApplyConstness2;
83     }else static if(constness == Constness.Const) {
84         alias const(Tu) ApplyConstness2;
85     }else static if(constness == Constness.Wildcard) {
86         alias Tu ApplyConstness2;
87     }else static if(constness == Constness.Immutable) {
88         alias immutable(Tu) ApplyConstness2;
89     }else {
90         static assert(0);
91     }
92 }
93 
94 string attrs_to_string(uint attrs) {
95     string s = "";
96     with(FunctionAttribute) {
97         if(attrs & pure_) s ~= " pure";
98         if(attrs & nothrow_) s ~= " nothrow";
99         if(attrs & ref_) s ~= " ref";
100         if(attrs & property) s ~= " @property";
101         if(attrs & trusted) s ~= " @trusted";
102         if(attrs & safe) s ~= " @safe";
103     }
104     return s;
105 }
106 
107 // what U should be so 'new U' returns a T
108 template NewParamT(T) {
109     static if(isPointer!T && is(PointerTarget!T == struct)) 
110         alias PointerTarget!T NewParamT;
111     else alias T NewParamT;
112 }
113 
114 template StripSafeTrusted(F) {
115     enum attrs = functionAttributes!F ; 
116     enum desired_attrs = attrs & ~FunctionAttribute.safe & ~FunctionAttribute.trusted;
117     enum linkage = functionLinkage!F;
118     alias SetFunctionAttributes!(F, linkage, desired_attrs) unqual_F;
119     static if(isFunctionPointer!F) {
120         enum constn = constness!(pointerTarget!F);
121         alias ApplyConstness!(pointerTarget!unqual_F, constn)* StripSafeTrusted;
122     }else static if(isDelegate!F) {
123         enum constn = constness!(F);
124         alias ApplyConstness!(unqual_F, constn) StripSafeTrusted;
125     }else{
126         enum constn = constness!(F);
127         alias ApplyConstness!(unqual_F, constn) StripSafeTrusted;
128     }
129 
130 
131 }
132 
133 class Z {
134     void a() immutable
135     {
136     }
137 }
138 //static assert(is(StripSafeTrusted!(typeof(&Z.a)) == typeof(&Z.a) ));
139 //static assert(is(StripSafeTrusted!(typeof(&Z.init.a)) == typeof(&Z.init.a) ));