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LinkedList helper functions (#493)

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* Restore LinkedList helper functions

* mem.Allocator
This commit is contained in:
Andrea Orru 2017-09-21 16:28:44 +02:00 committed by Andrew Kelley
parent c2f3dc94eb
commit e7a01c24a3
1 changed files with 47 additions and 27 deletions
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74
std/linked_list.zig
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@ -1,6 +1,7 @@
const debug = @import("debug.zig");
const assert = debug.assert;
const mem = @import("mem.zig");
const Allocator = mem.Allocator;
/// Generic doubly linked list.
pub fn LinkedList(comptime T: type) -> type {
@ -15,9 +16,9 @@ pub fn LinkedList(comptime T: type) -> type {
pub fn init(data: &const T) -> Node {
Node {
.data = *data,
.prev = null,
.next = null,
.data = *data,
}
}
};
@ -157,38 +158,57 @@ pub fn LinkedList(comptime T: type) -> type {
return first;
}
/// Allocate a new node.
///
/// Arguments:
/// allocator: Dynamic memory allocator.
///
/// Returns:
/// A pointer to the new node.
pub fn allocateNode(list: &Self, allocator: &Allocator) -> %&Node {
allocator.create(Node)
}
/// Deallocate a node.
///
/// Arguments:
/// node: Pointer to the node to deallocate.
/// allocator: Dynamic memory allocator.
pub fn destroyNode(list: &Self, node: &Node, allocator: &Allocator) {
allocator.destroy(node);
}
/// Allocate and initialize a node and its data.
///
/// Arguments:
/// data: The data to put inside the node.
/// allocator: Dynamic memory allocator.
///
/// Returns:
/// A pointer to the new node.
pub fn createNode(list: &Self, data: &const T, allocator: &Allocator) -> %&Node {
var node = %return list.allocateNode(allocator);
*node = Node.init(data);
return node;
}
}
}
pub fn testAllocateNode(comptime T: type, list: &LinkedList(T), allocator: &mem.Allocator) -> %&LinkedList(T).Node {
allocator.create(LinkedList(T).Node)
}
pub fn testDestroyNode(comptime T: type, list: &LinkedList(T), node: &LinkedList(T).Node, allocator: &mem.Allocator) {
allocator.destroy(node);
}
pub fn testCreateNode(comptime T: type, list: &LinkedList(T), data: &const T, allocator: &mem.Allocator) -> %&LinkedList(T).Node {
var node = %return testAllocateNode(T, list, allocator);
*node = LinkedList(T).Node.init(data);
return node;
}
test "basic linked list test" {
const allocator = &debug.global_allocator;
var list = LinkedList(u32).init();
var one = %%testCreateNode(u32, &list, 1, allocator);
var two = %%testCreateNode(u32, &list, 2, allocator);
var three = %%testCreateNode(u32, &list, 3, allocator);
var four = %%testCreateNode(u32, &list, 4, allocator);
var five = %%testCreateNode(u32, &list, 5, allocator);
var one = %%list.createNode(1, allocator);
var two = %%list.createNode(2, allocator);
var three = %%list.createNode(3, allocator);
var four = %%list.createNode(4, allocator);
var five = %%list.createNode(5, allocator);
defer {
testDestroyNode(u32, &list, one, allocator);
testDestroyNode(u32, &list, two, allocator);
testDestroyNode(u32, &list, three, allocator);
testDestroyNode(u32, &list, four, allocator);
testDestroyNode(u32, &list, five, allocator);
list.destroyNode(one, allocator);
list.destroyNode(two, allocator);
list.destroyNode(three, allocator);
list.destroyNode(four, allocator);
list.destroyNode(five, allocator);
}
list.append(two); // {2}
@ -197,7 +217,7 @@ test "basic linked list test" {
list.insertBefore(five, four); // {1, 2, 4, 5}
list.insertAfter(two, three); // {1, 2, 3, 4, 5}
// traverse forwards
// Traverse forwards.
{
var it = list.first;
var index: u32 = 1;
@ -207,7 +227,7 @@ test "basic linked list test" {
}
}
// traverse backwards
// Traverse backwards.
{
var it = list.last;
var index: u32 = 1;