replaceMembers

Inspects a passed struct or class for members whose values match that of the passed token. Matches members are set to a replacement value, which is an optional parameter that defaults to the .init value of the token's type.

@safe pure nothrow @nogc

void

replaceMembers

(

Flag!"recurse" recurse = No.recurse

Thing

Token

)

(

ref Thing thing

Token token

Token replacement = Token.init

)

if (

isAggregateType!Thing &&

isMutable!Thing

isEqualityComparable!Token

)

Parameters

recurse: Whether or not to recurse into aggregate members.
thing Thing: Reference to a struct or class whose members to iterate over.
token Token: What value to look for in members, be it a string or an integer or whatever; anything that can be compared to.
replacement Token: What to assign matched values. Defaults to the .init of the matched type.

Examples

1 struct Bar
2 {
3     string s = "content";
4 }
5 
6 struct Foo
7 {
8     Bar b;
9     string s = "more content";
10 }
11 
12 Foo foo1, foo2;
13 foo1.replaceMembers("-");
14 assert(foo1 == foo2);
15 
16 foo2.s = "-";
17 foo2.replaceMembers("-");
18 assert(!foo2.s.length);
19 foo2.b.s = "-";
20 foo2.replaceMembers!(Yes.recurse)("-", "herblp");
21 assert((foo2.b.s == "herblp"), foo2.b.s);
22 
23 Foo foo3;
24 foo3.s = "---";
25 foo3.b.s = "---";
26 foo3.replaceMembers!(No.recurse)("---");
27 assert(!foo3.s.length);
28 assert((foo3.b.s == "---"), foo3.b.s);
29 foo3.replaceMembers!(Yes.recurse)("---");
30 assert(!foo3.b.s.length);
31 
32 class Baz
33 {
34     string barS = "init";
35     string barT = "*";
36     Foo f;
37 }
38 
39 Baz b1 = new Baz;
40 Baz b2 = new Baz;
41 
42 b1.replaceMembers("-");
43 assert((b1.barS == b2.barS), b1.barS);
44 assert((b1.barT == b2.barT), b1.barT);
45 
46 b1.replaceMembers("*");
47 assert(b1.barS.length, b1.barS);
48 assert(!b1.barT.length, b1.barT);
49 assert(b1.f.s.length, b1.f.s);
50 
51 b1.replaceMembers!(Yes.recurse)("more content");
52 assert(!b1.f.s.length, b1.f.s);
53 
54 import std.conv : to;
55 
56 struct Qux
57 {
58     int i = 42;
59 }
60 
61 Qux q;
62 
63 q.replaceMembers("*");
64 assert(q.i == 42);
65 
66 q.replaceMembers(43);
67 assert(q.i == 42);
68 
69 q.replaceMembers(42, 99);
70 assert((q.i == 99), q.i.to!string);
71 
72 struct Flerp
73 {
74     string[] arr;
75 }
76 
77 Flerp flerp;
78 flerp.arr = [ "-" ];
79 assert(flerp.arr.length == 1);
80 flerp.replaceMembers("-");
81 assert(!flerp.arr.length);

replaceMembers

Parameters

Examples

Meta

Source