80 lines
2.1 KiB
Zig
80 lines
2.1 KiB
Zig
const std = @import("std.zig");
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const HashMap = @import("hash_map.zig").HashMap;
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const mem = @import("mem.zig");
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const Allocator = mem.Allocator;
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const testing = std.testing;
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pub const BufSet = struct {
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hash_map: BufSetHashMap,
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const BufSetHashMap = HashMap([]const u8, void, mem.hash_slice_u8, mem.eql_slice_u8);
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pub fn init(a: *Allocator) BufSet {
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var self = BufSet{ .hash_map = BufSetHashMap.init(a) };
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return self;
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}
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pub fn deinit(self: *const BufSet) void {
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var it = self.hash_map.iterator();
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while (true) {
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const entry = it.next() orelse break;
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self.free(entry.key);
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}
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self.hash_map.deinit();
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}
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pub fn put(self: *BufSet, key: []const u8) !void {
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if (self.hash_map.get(key) == null) {
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const key_copy = try self.copy(key);
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errdefer self.free(key_copy);
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_ = try self.hash_map.put(key_copy, {});
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}
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}
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pub fn exists(self: BufSet, key: []const u8) bool {
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return self.hash_map.get(key) != null;
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}
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pub fn delete(self: *BufSet, key: []const u8) void {
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const entry = self.hash_map.remove(key) orelse return;
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self.free(entry.key);
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}
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pub fn count(self: *const BufSet) usize {
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return self.hash_map.count();
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}
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pub fn iterator(self: *const BufSet) BufSetHashMap.Iterator {
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return self.hash_map.iterator();
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}
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pub fn allocator(self: *const BufSet) *Allocator {
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return self.hash_map.allocator;
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}
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fn free(self: *const BufSet, value: []const u8) void {
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self.hash_map.allocator.free(value);
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}
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fn copy(self: *const BufSet, value: []const u8) ![]const u8 {
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const result = try self.hash_map.allocator.alloc(u8, value.len);
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mem.copy(u8, result, value);
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return result;
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}
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};
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test "BufSet" {
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var bufset = BufSet.init(std.heap.direct_allocator);
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defer bufset.deinit();
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try bufset.put("x");
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testing.expect(bufset.count() == 1);
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bufset.delete("x");
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testing.expect(bufset.count() == 0);
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try bufset.put("x");
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try bufset.put("y");
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try bufset.put("z");
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}
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