aermicioi.aedi_property_reader.convertor.traits source code

1 /**
2 License:
3     Boost Software License - Version 1.0 - August 17th, 2003
4 
5     Permission is hereby granted, free of charge, to any person or organization
6     obtaining a copy of the software and accompanying documentation covered by
7     this license (the "Software") to use, reproduce, display, distribute,
8     execute, and transmit the Software, and to prepare derivative works of the
9     Software, and to permit third-parties to whom the Software is furnished to
10     do so, all subject to the following:
11 
12     The copyright notices in the Software and this entire statement, including
13     the above license grant, this restriction and the following disclaimer,
14     must be included in all copies of the Software, in whole or in part, and
15     all derivative works of the Software, unless such copies or derivative
16     works are solely in the form of machine-executable object code generated by
17     a source language processor.
18 
19     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21     FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
22     SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
23     FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
24     ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25     DEALINGS IN THE SOFTWARE.
26 
27 Authors:
28     Alexandru Ermicioi
29 **/
30 module aermicioi.aedi_property_reader.convertor.traits;
31 
32 import std.traits : functionAttributes, variadicFunctionStyle, Variadic, FunctionAttribute, arity;
33 
34 /**
35 Tests if field is property getter.
36 **/
37 template isPropertyGetter(alias func) {
38     bool isPropertyGetter() {
39         static foreach (overload; __traits(getOverloads, func)) {
40 
41             if (
42                 (variadicFunctionStyle!overload == Variadic.no) &&
43                 (arity!overload == 0) && (functionAttributes!overload & FunctionAttribute.property)
44             ) {
45                 return true;
46             }
47         }
48 
49         return false;
50     }
51 }
52 
53 /**
54 Tests if field is property setter
55 **/
56 template isPropertyPropertySetter(alias Type, string member) {
57     static foreach (overload; __traits(getOverloads, Type, member)) {
58         static if (!is(found) && isPropertyPropertySetter!overload) {
59             enum found = true;
60             enum isPropertyPropertySetter = found;
61         }
62     }
63 
64     static if (!is(found) && isPropertyPropertySetter!overload) {
65         enum isPropertyPropertySetter = false;
66     }
67 
68 }
69 
70 /**
71 ditto
72 **/
73 enum isPropertyPropertySetter(alias func) = (variadicFunctionStyle!func == Variadic.no) &&
74     (arity!func == 1) && (functionAttributes!func & FunctionAttribute.property);
75 
76 template match(alias predicate, Types...) {
77 
78     static foreach (alias T; Types) {
79         static if (!is(typeof(found)) && predicate!T) {
80             enum found = true;
81             alias match = T;
82         }
83     }
84 
85     static if (!is(typeof(found)) || !found) {
86 
87         static assert(false, "No match found for passed template args");
88     }
89 }
90 
91 /**
92 Well, it's a nothrow wrapper usable for logger to allow logging in nothrow functions.
93 **/
94 T n(T)(lazy T value) nothrow {
95     try {
96         static if (is(T == void)) {
97 
98             value();
99         } else {
100 
101             return value();
102         }
103     } catch (Exception e) {
104         assert(false, "An exception was thrown where it wasn't expected to.");
105     }
106 }
107 
108 enum isD(T, X) = is(T : X);
109 
110 interface PureSafeNothrowToString {
111     string toString() @safe pure nothrow;
112 }