67 lines
1.9 KiB
Zig
67 lines
1.9 KiB
Zig
const std = @import("std");
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const mem = std.mem;
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const Allocator = mem.Allocator;
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const Group = @This();
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gid: u32,
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name: [:0]const u8,
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// should be [:null]const ?[:0]const u8, but it crashes the compiler. See
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// https://github.com/ziglang/zig/issues/7517.
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// members[members.len] is always null for cloned groups. Once the bug
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// in the compiler is fixed, we should update the return type here.
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members: []const ?[:0]const u8,
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pub fn clone(self: *const Group, allocator: Allocator) Allocator.Error!Group {
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var members = try allocator.alloc(?[:0]const u8, self.members.len + 1);
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errdefer allocator.free(members);
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members.len = self.members.len + 1;
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for (self.members) |member, i| {
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members[i] = try allocator.dupeZ(u8, member.?);
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errdefer allocator.free(members[i]);
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}
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members[self.members.len] = null;
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members.len = self.members.len;
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return Group{
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.gid = self.gid,
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.name = try allocator.dupeZ(u8, self.name),
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.members = members,
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};
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}
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pub fn deinit(self: *Group, allocator: Allocator) void {
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allocator.free(self.name);
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for (self.members) |member| {
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allocator.free(member.?);
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}
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allocator.free(self.members);
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self.* = undefined;
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}
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const testing = std.testing;
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test "Group.clone" {
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// TODO: how to do this on stack?
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var member1 = try testing.allocator.dupeZ(u8, "member1");
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defer testing.allocator.free(member1);
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var group = Group{
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.gid = 1,
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.name = "foo",
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.members = &[_:null]?[:0]const u8{ member1, "member2" },
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};
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var cloned = try group.clone(testing.allocator);
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defer cloned.deinit(testing.allocator);
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group.gid = 2;
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group.name = "bar";
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member1[0] = 'x';
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try testing.expectEqual(cloned.gid, 1);
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try testing.expectEqualSlices(u8, cloned.name, "foo");
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try testing.expectEqualSlices(u8, cloned.members[0].?, "member1");
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}
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