417 lines
6.0 KiB
D
417 lines
6.0 KiB
D
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Copyright: Eugene Wissner 2016-2017.
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* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
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* Mozilla Public License, v. 2.0).
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* Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
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*/
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module tanya.container.list;
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import std.algorithm.comparison;
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import std.algorithm.searching;
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import std.traits;
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import tanya.container.entry;
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import tanya.memory;
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private struct Range(E)
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if (__traits(isSame, TemplateOf!E, SEntry))
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{
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private alias T = typeof(E.content);
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private E* head;
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private this(E* head)
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{
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this.head = head;
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}
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@property Range save()
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{
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return this;
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}
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@property size_t length() const
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{
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return count(opIndex());
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}
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@property bool empty() const
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{
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return head is null;
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}
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@property ref inout(T) front() inout
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in
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{
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assert(!empty);
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}
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body
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{
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return head.content;
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}
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void popFront()
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in
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{
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assert(!empty);
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}
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body
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{
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head = head.next;
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}
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Range opIndex()
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{
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return typeof(return)(head);
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}
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Range!(const E) opIndex() const
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{
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return typeof(return)(head);
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}
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}
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/**
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* Singly-linked list.
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*
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* Params:
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* T = Content type.
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*/
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struct SList(T)
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{
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private alias Entry = SEntry!T;
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// 0th element of the list.
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private Entry* head;
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/**
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* Removes all elements from the list.
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*/
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~this()
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{
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clear();
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}
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/**
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* Removes all contents from the list.
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*/
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void clear()
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{
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while (!empty)
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{
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removeFront();
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}
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}
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///
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unittest
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{
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SList!int l;
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l.insertFront(8);
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l.insertFront(5);
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l.clear();
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assert(l.empty);
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}
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/**
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* Returns: First element.
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*/
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@property ref inout(T) front() inout
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in
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{
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assert(!empty);
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}
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body
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{
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return head.content;
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}
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/**
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* Inserts a new element at the beginning.
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*
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* Params:
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* x = New element.
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*/
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void insertFront(ref T x)
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{
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auto temp = allocator.make!Entry;
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temp.content = x;
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temp.next = head;
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head = temp;
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}
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/// Ditto.
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void insertFront(T x)
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{
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insertFront(x);
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}
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/// Ditto.
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alias insert = insertFront;
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///
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unittest
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{
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SList!int l;
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l.insertFront(8);
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assert(l.front == 8);
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l.insertFront(9);
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assert(l.front == 9);
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}
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/**
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* Returns: How many elements are in the list.
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*/
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@property size_t length() const
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{
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return count(opIndex());
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}
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///
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unittest
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{
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SList!int l;
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l.insertFront(8);
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l.insertFront(9);
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assert(l.length == 2);
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l.removeFront();
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assert(l.length == 1);
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l.removeFront();
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assert(l.length == 0);
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}
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/**
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* Comparison for equality.
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*
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* Params:
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* that = The list to compare with.
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*
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* Returns: $(D_KEYWORD true) if the lists are equal, $(D_KEYWORD false)
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* otherwise.
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*/
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bool opEquals()(auto ref typeof(this) that) @trusted
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{
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return equal(opIndex(), that[]);
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}
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/// Ditto.
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bool opEquals()(in auto ref typeof(this) that) const @trusted
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{
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return equal(opIndex(), that[]);
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}
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///
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unittest
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{
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SList!int l1, l2;
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l1.insertFront(8);
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l1.insertFront(9);
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l2.insertFront(8);
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l2.insertFront(10);
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assert(l1 != l2);
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l1.removeFront();
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assert(l1 != l2);
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l2.removeFront();
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assert(l1 == l2);
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l1.removeFront();
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assert(l1 != l2);
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l2.removeFront();
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assert(l1 == l2);
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}
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/**
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* Returns: $(D_KEYWORD true) if the list is empty.
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*/
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@property bool empty() const
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{
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return head is null;
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}
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/**
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* Returns the first element and moves to the next one.
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*
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* Returns: The first element.
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*
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* Precondition: $(D_INLINECODE !empty)
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*/
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void removeFront()
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in
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{
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assert(!empty);
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}
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body
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{
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auto n = head.next;
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allocator.dispose(head);
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head = n;
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}
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///
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unittest
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{
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SList!int l;
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l.insertFront(8);
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l.insertFront(9);
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assert(l.front == 9);
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l.removeFront();
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assert(l.front == 8);
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l.removeFront();
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assert(l.empty);
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}
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/**
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* Removes $(D_PARAM howMany) elements from the list.
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*
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* Unlike $(D_PSYMBOL removeFront()), this method doesn't fail, if it could not
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* remove $(D_PARAM howMany) elements. Instead, if $(D_PARAM howMany) is
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* greater than the list length, all elements are removed.
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*
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* Params:
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* howMany = How many elements should be removed.
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*
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* Returns: The number of elements removed.
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*/
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size_t removeFront(in size_t howMany)
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out (removed)
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{
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assert(removed <= howMany);
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}
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body
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{
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size_t i;
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for (; i < howMany && !empty; ++i)
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{
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removeFront();
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}
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return i;
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}
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/// Ditto.
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alias remove = removeFront;
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///
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unittest
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{
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SList!int l;
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l.insertFront(8);
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l.insertFront(5);
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l.insertFront(4);
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assert(l.removeFront(0) == 0);
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assert(l.removeFront(2) == 2);
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assert(l.removeFront(3) == 1);
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assert(l.removeFront(3) == 0);
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}
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/**
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* $(D_KEYWORD foreach) iteration.
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*
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* Params:
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* dg = $(D_KEYWORD foreach) body.
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*
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* Returns: The value returned from $(D_PARAM dg).
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*/
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int opApply(scope int delegate(ref size_t i, ref T) @nogc dg)
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{
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int result;
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size_t i;
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for (auto pos = head; pos; pos = pos.next, ++i)
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{
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result = dg(i, pos.content);
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if (result != 0)
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{
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return result;
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}
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}
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return result;
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}
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/// Ditto.
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int opApply(scope int delegate(ref T) @nogc dg)
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{
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int result;
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for (auto pos = head; pos; pos = pos.next)
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{
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result = dg(pos.content);
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if (result != 0)
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{
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return result;
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}
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}
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return result;
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}
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///
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unittest
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{
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SList!int l;
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l.insertFront(5);
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l.insertFront(4);
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l.insertFront(9);
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foreach (i, e; l)
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{
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assert(i != 0 || e == 9);
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assert(i != 1 || e == 4);
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assert(i != 2 || e == 5);
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}
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}
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Range!Entry opIndex()
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{
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return typeof(return)(head);
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}
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Range!(const Entry) opIndex() const
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{
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return typeof(return)(head);
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}
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mixin DefaultAllocator;
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}
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///
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unittest
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{
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SList!int l;
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size_t i;
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l.insertFront(5);
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l.insertFront(4);
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l.insertFront(9);
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foreach (e; l)
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{
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assert(i != 0 || e == 9);
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assert(i != 1 || e == 4);
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assert(i != 2 || e == 5);
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++i;
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}
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assert(i == 3);
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}
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unittest
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{
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interface Stuff
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{
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}
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static assert(is(SList!Stuff));
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}
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