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# std.container.slist

This module implements a singly-linked list container. It can be used as a stack.
This module is a submodule of std.container.

Source std/container/slist.d

License:
Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at boost.org/LICENSE_1_0.txt).
Authors:
Andrei Alexandrescu
Examples:

    import std.algorithm.comparison : equal;
    import std.container : SList;

    auto s = SList!int(1, 2, 3);
    assert(equal(s[], [1, 2, 3]));

    s.removeFront();
    assert(equal(s[], [2, 3]));

    s.insertFront([5, 6]);
    assert(equal(s[], [5, 6, 2, 3]));

    // If you want to apply range operations, simply slice it.
    import std.algorithm.searching : countUntil;
    import std.range : popFrontN, walkLength;

    auto sl = SList!int(1, 2, 3, 4, 5);
    writeln(countUntil(sl[], 2)); // 1

    auto r = sl[];
    popFrontN(r, 2);
    writeln(walkLength(r)); // 3

struct `SList`(T) if (!is(T == shared));
  Implements a simple and fast singly-linked list. It can be used as a stack.
  `SList` uses reference semantics.
  this(U)(U[] `values`...)
  if (isImplicitlyConvertible!(U, T));
    Constructor taking a number of nodes
  this(Stuff)(Stuff `stuff`)
  if (isInputRange!Stuff && isImplicitlyConvertible!(ElementType!Stuff, T) && !is(Stuff == T[]));
    Constructor taking an input range
  const bool `opEquals`(const SList `rhs`);
  const bool `opEquals`(ref const SList `rhs`);
    Comparison for equality.

    Complexity Ο(min(n, n1)) where n1 is the number of elements in `rhs`.

  struct `Range`;
    Defines the container's primary range, which embodies a forward range.
    const @property bool `empty`();
    @property ref T `front`();
    void `popFront`();
      Input range primitives.
    @property Range `save`();
      Forward range primitive.
  const @property bool `empty`();
    Property returning true if and only if the container has no elements.

    Complexity Ο(1)

  @property SList `dup`();
    Duplicates the container. The elements themselves are not transitively duplicated.

    Complexity Ο(n).

  Range `opSlice`();
    Returns a range that iterates over all elements of the container, in forward order.

    Complexity Ο(1)

  @property ref T `front`();
    Forward to opSlice().`front`.

    Complexity Ο(1)

  SList `opBinary`(string op, Stuff)(Stuff `rhs`)
  if (op == "~" && is(typeof(SList(`rhs`))));
  SList `opBinaryRight`(string op, Stuff)(Stuff `lhs`)
  if (op == "~" && !is(typeof(`lhs`.opBinary!"~"(this))) && is(typeof(SList(`lhs`))));
    Returns a new SList that's the concatenation of this and its argument. `opBinaryRight` is only defined if Stuff does not define `opBinary`.
  void `clear`();
    Removes all contents from the SList.

    Postcondition empty

    Complexity Ο(1)

  void `reverse`();
    Reverses SList in-place. Performs no memory allocation.

    Complexity Ο(n)

  size_t `insertFront`(Stuff)(Stuff `stuff`)
  if (isInputRange!Stuff || isImplicitlyConvertible!(Stuff, T));
  alias `insert` = insertFront;
  alias `stableInsert` = insert;
  alias `stableInsertFront` = insertFront;
    Inserts `stuff` to the front of the container. `stuff` can be a value convertible to T or a range of objects convertible to T. The stable version behaves the same, but guarantees that ranges iterating over the container are never invalidated.
    Returns:
    The number of elements inserted

    Complexity Ο(m), where m is the length of `stuff`

  T `removeAny`();
  alias `stableRemoveAny` = removeAny;
    Picks one value in an unspecified position in the container, removes it from the container, and returns it. The stable version behaves the same, but guarantees that ranges iterating over the container are never invalidated.

    Precondition !empty

    Returns:
    The element removed.

    Complexity Ο(1).

  void `removeFront`();
  alias `stableRemoveFront` = removeFront;
    Removes the value at the front of the container. The stable version behaves the same, but guarantees that ranges iterating over the container are never invalidated.

    Precondition !empty

    Complexity Ο(1).

  size_t `removeFront`(size_t `howMany`);
  alias `stableRemoveFront` = removeFront;
    Removes `howMany` values at the front or back of the container. Unlike the unparameterized versions above, these functions do not throw if they could not remove `howMany` elements. Instead, if howMany > n, all elements are removed. The returned value is the effective number of elements removed. The stable version behaves the same, but guarantees that ranges iterating over the container are never invalidated.
    Returns:
    The number of elements removed

    Complexity Ο(howMany * log(n)).

  size_t `insertAfter`(Stuff)(Range `r`, Stuff `stuff`)
  if (isInputRange!Stuff || isImplicitlyConvertible!(Stuff, T));
    Inserts `stuff` after range `r`, which must be a range previously extracted from this container. Given that all ranges for a list end at the end of the list, this function essentially appends to the list and uses `r` as a potentially fast way to reach the last node in the list. Ideally `r` is positioned near or at the last element of the list.
    `stuff` can be a value convertible to T or a range of objects convertible to T. The stable version behaves the same, but guarantees that ranges iterating over the container are never invalidated.
    Returns:
    The number of values inserted.

    Complexity Ο(k + m), where k is the number of elements in `r` and m is the length of `stuff`.

    Example

        auto sl = SList!string(["a", "b", "d"]);
        sl.insertAfter(sl[], "e"); // insert at the end (slowest)
        assert(std.algorithm.equal(sl[], ["a", "b", "d", "e"]));
        sl.insertAfter(std.range.take(sl[], 2), "c"); // insert after "b"
        assert(std.algorithm.equal(sl[], ["a", "b", "c", "d", "e"]));

  size_t `insertAfter`(Stuff)(Take!Range `r`, Stuff `stuff`)
  if (isInputRange!Stuff || isImplicitlyConvertible!(Stuff, T));
  alias `stableInsertAfter` = insertAfter;
    Similar to `insertAfter` above, but accepts a range bounded in count. This is important for ensuring fast insertions in the middle of the list. For fast insertions after a specified position `r`, use insertAfter(take(r, 1), stuff). The complexity of that operation only depends on the number of elements in `stuff`.

    Precondition r.original.empty || r.maxLength > 0

    Returns:
    The number of values inserted.

    Complexity Ο(k + m), where k is the number of elements in `r` and m is the length of `stuff`.

  Range `linearRemove`(Range `r`);
    Removes a range from the list in linear time.
    Returns:
    An empty range.

    Complexity Ο(n)

  Range `linearRemove`(Take!Range `r`);
  alias `stableLinearRemove` = linearRemove;
    Removes a Take!Range from the list in linear time.
    Returns:
    A range comprehending the elements after the removed range.

    Complexity Ο(n)

  bool `linearRemoveElement`(T `value`);
    Removes the first occurence of an element from the list in linear time.
    Returns:
    True if the element existed and was successfully removed, false otherwise.
    Parameters:

    T `value` | value of the node to be removed

    Complexity Ο(n)

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