Zollections

Documentation | API

Zig collections library

Zollections is part of zedd, a collection of useful libraries for zig.

Zollections

Zollections is a collections library for Zig. It's made to ease memory management of dynamically allocated slices and elements.

Versions

Zollections 0.1.1 is made and tested with zig 0.13.0.

How to use

Install

In your project directory:

$ zig fetch --save https://code.zeptotech.net/zedd/zollections/archive/v0.1.1.tar.gz

In build.zig:

// Add zollections dependency.
const zollections = b.dependency("zollections", .{
	.target = target,
	.optimize = optimize,
});
exe.root_module.addImport("zollections", zollections.module("zollections"));

Examples

These examples are taken from tests in tests/collection.zig.

Simple collection

// Allocate your slice.
const slice = try allocator.alloc(*u8, 3);
// Create your slice elements.
slice[0] = try allocator.create(u8);
slice[1] = try allocator.create(u8);
slice[2] = try allocator.create(u8);

// Create a collection with your slice of elements.
const collection = try zollections.Collection(u8).init(allocator, slice);
// Free your collection: your slice and all your elements will be freed.
defer collection.deinit();

Recursive free

// Create a pointer to a slice.
const slicePointer = try allocator.create([]*u8);

// Allocate your slice in the pointed slice.
slicePointer.* = try allocator.alloc(*u8, 3);
// Create slice elements.
slicePointer.*[0] = try allocator.create(u8);
slicePointer.*[1] = try allocator.create(u8);
slicePointer.*[2] = try allocator.create(u8);

// Allocate your slice or pointers to slices.
const slice = try allocator.alloc(*[]*u8, 1);
slice[0] = slicePointer;

// Create a collection with your slice of elements.
const collection = try zollections.Collection([]*u8).init(allocator, slice);
// Free your collection: your slice and all your slices and their elements will be freed.
defer collection.deinit();

Custom structure deinitialization

/// An example structure.
const ExampleStruct = struct {
	const Self = @This();

	allocator: std.mem.Allocator,
	buffer: []u8,

	/// Initialize a new example struct.
	pub fn init(bufSiz: usize) !Self
	{
		const allocator = std.testing.allocator;

		return .{
			.allocator = allocator,
			.buffer = try allocator.alloc(u8, bufSiz),
		};
	}

	/// Deinitialize the example struct.
	pub fn deinit(self: *Self) void
	{
		self.allocator.free(self.buffer);
	}
};

// Allocate your slice.
const slice = try allocator.alloc(*ExampleStruct, 3);
// Create your slice elements with custom structs and their inner init / deinit.
slice[0] = try allocator.create(ExampleStruct);
slice[0].* = try ExampleStruct.init(4);
slice[1] = try allocator.create(ExampleStruct);
slice[1].* = try ExampleStruct.init(8);
slice[2] = try allocator.create(ExampleStruct);
slice[2].* = try ExampleStruct.init(16);

// Create a collection with your slice of elements.
const collection = try zollections.Collection(ExampleStruct).init(allocator, slice);
// Free your collection: your slice and all your elements will be deinitialized and freed.
defer collection.deinit();