blob: 62a4feb68c57c828a65a01234589f86a239b114b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
const std = @import("std");
pub fn Rc(comptime T: type) type {
const Cell = struct {
value: T,
ref_count: usize,
};
return struct {
const Self = @This();
cell: *Cell,
pub fn init(allocator: std.mem.Allocator, value: T) std.mem.Allocator.Error!Self {
const cell = try allocator.create(Cell);
cell.* = .{ .value = value, .ref_count = 1 };
return .{ .cell = cell };
}
pub fn release(self: Self, allocator: std.mem.Allocator) void {
self.cell.ref_count -= 1;
if (self.cell.ref_count == 0) {
allocator.destroy(self.cell);
}
}
pub fn retain(self: Self) Self {
self.cell.ref_count += 1;
return .{ .cell = self.cell };
}
pub fn isUnique(self: Self) bool {
return self.cell.ref_count == 1;
}
pub fn get(self: Self) *T {
return &self.cell.value;
}
};
}
|
