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Zig
at main
123456789101112131415161718192021222324252627282930313233343536373839404142434445const std = @import("std");const Allocator = std.mem.Allocator;
/// A collection of ArrayLists with methods for bulk operations.pub fn ArrayListCollection(comptime T: type) type { return struct { const Self = ArrayListCollection(T); const ArrayListT = std.ArrayListUnmanaged(T);
// An array containing the lists that belong to this collection. lists: []ArrayListT,
// The collection will be initialized with empty ArrayLists. pub fn init( alloc: Allocator, list_count: usize, initial_capacity: usize, ) Allocator.Error!Self { const self: Self = .{ .lists = try alloc.alloc(ArrayListT, list_count), };
for (self.lists) |*list| { list.* = try .initCapacity(alloc, initial_capacity); }
return self; }
pub fn deinit(self: *Self, alloc: Allocator) void { for (self.lists) |*list| { list.deinit(alloc); } alloc.free(self.lists); }
/// Clear all lists in the collection, retaining capacity. pub fn reset(self: *Self) void { for (self.lists) |*list| { list.clearRetainingCapacity(); } } };}