Class TMutableSet

Unit

hamt.sets

Declaration

type generic TMutableSet<TItem,TInfo> = class(specialize TReadOnlySet<TItem,TInfo>)

Description

Generic mutable set

Data in this set can be read (see ancestor TReadOnlySet) and modified.

Example:

type TMutableSetString = specialize TMutableSet<string, THAMTTypeInfo>;
var stringSet: TMutableSetString;
    p: TMutableSetString.PItem;
begin
  stringSet := TMutableSetString.create;
  stringSet.Insert('hello');
  stringSet.insert('foo');

  writeln(stringSet['hello']); // true
  writeln(stringSet.contains('foo')); // true
  writeln(stringSet.contains('abc')); // false

  //enumerate all
  for p in stringSet do
    writeln(pˆ);

  stringSet.free;
end.

Hierarchy

• TReadOnlyCustomSet
• TReadOnlySet
• TMutableSet

Overview

Methods

	constructor Create;
	constructor Create(other: specialize TReadOnlyCustomSet<TItem, TInfo>);
	function include(const item: TItem; allowOverride: boolean = true): boolean; inline;
	function exclude(const item: TItem): boolean; inline;
	procedure insert(const item: TItem); inline;
	procedure remove(const item: TItem); inline;
	procedure clear;
	function clone: TMutableSet;

Properties

property items[item: TItem]: Boolean read contains write toggleItem;

Description

Methods

	constructor Create;
Creates an empty set

	constructor Create(other: specialize TReadOnlyCustomSet<TItem, TInfo>);
Creates a set equal to other. No data is copied, till either set is modified (copy-on-write).

	function include(const item: TItem; allowOverride: boolean = true): boolean; inline;
Inserts an item, if the set does not contain the item or allowOverride is true. Returns If the set did not contain item.

	function exclude(const item: TItem): boolean; inline;
Removes an item, Returns If the set did contain item.

	procedure insert(const item: TItem); inline;
Inserts an item, or raises an exception if the set already contains the item

	procedure remove(const item: TItem); inline;
Removes an item, or raises an exception if the set did not contain the item

	procedure clear;
Removes everything from the set;

	function clone: TMutableSet;
Creates a new set equal to self. No data is copied, till either set is modified (copy-on-write).

Properties

	property items[item: TItem]: Boolean read contains write toggleItem;
Default parameter, so you can test and update the set with set[key]

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