tempSetField_conservativeUndo [1031595]

< > BotCompany Repo | #1031595 // tempSetField_conservativeUndo

JavaX fragment (include) [tags: use-pretranspiled]

static AutoCloseable tempSetField_conservativeUndo(O o, S field, O value) {
  fO oldValue = get(o, field);
  set(o, field, value);
  ret () -> { if (eq(get(o, field), value)) set(o, field, oldValue); };
}

static <A> AutoCloseable tempSetField_conservativeUndo(ISetAndGet<A> gs, A value) {
  if (gs == null) null; // convenient null propagation as always in JavaX!
  A oldValue = gs!;
  gs.set(value);
  ret () -> { if (eq(gs!, value)) gs.set(oldValue); };
}

static <A> AutoCloseable tempSetField_conservativeUndo(A value, ISetAndGet<A> gs) {
  ret tempSetField(gs, value);
}

Author comment

Began life as a copy of #1016243

Travelled to 4 computer(s): bhatertpkbcr, mqqgnosmbjvj, pyentgdyhuwx, vouqrxazstgt

Snippet ID:

#1031595

Snippet name:

tempSetField_conservativeUndo

Eternal ID of this version:

#1031595/1

Text MD5:

ac36ebeb86fdf7a97fc9dcea6b5634ab

Transpilation MD5:

cee8da2634f5fa620289e30ce5324ed3

Author:

stefan

Category:

javax

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2021-06-22 07:52:21

Source code size:

591 bytes / 16 lines

Pitched / IR pitched:

No / No

Views / Downloads:

146 / 216

Referenced in:

[show references]

1	static AutoCloseable tempSetField_conservativeUndo(O o, S field, O value) {
2	fO oldValue = get(o, field);
3	set(o, field, value);
4	ret () -> { if (eq(get(o, field), value)) set(o, field, oldValue); };
5	}
6
7	static <A> AutoCloseable tempSetField_conservativeUndo(ISetAndGet<A> gs, A value) {
8	if (gs == null) null; // convenient null propagation as always in JavaX!
9	A oldValue = gs!;
10	gs.set(value);
11	ret () -> { if (eq(gs!, value)) gs.set(oldValue); };
12	}
13
14	static <A> AutoCloseable tempSetField_conservativeUndo(A value, ISetAndGet<A> gs) {
15	ret tempSetField(gs, value);
16	}